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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.master.balancer;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.ArrayDeque;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.ArrayList;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.util.Arrays;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.Collection;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.Collections;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.util.Deque;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.HashMap;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import java.util.LinkedList;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import java.util.Map;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import java.util.Objects;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import java.util.Random;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import java.util.stream.Collectors;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span><a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.conf.Configuration;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.ClusterMetrics;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.HBaseInterfaceAudience;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.HConstants;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.RegionMetrics;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.ServerMetrics;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.ServerName;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.TableName;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.master.MasterServices;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.master.RegionPlan;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.Action.Type;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.AssignRegionAction;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.LocalityType;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.MoveRegionAction;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.master.balancer.BaseLoadBalancer.Cluster.SwapRegionsAction;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.util.ReflectionUtils;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span>import org.slf4j.Logger;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span>import org.slf4j.LoggerFactory;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span>import org.apache.hbase.thirdparty.com.google.common.base.Optional;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span>import org.apache.hbase.thirdparty.com.google.common.collect.Lists;<a name="line.59"></a> |
| <span class="sourceLineNo">060</span><a name="line.60"></a> |
| <span class="sourceLineNo">061</span><a name="line.61"></a> |
| <span class="sourceLineNo">062</span>/**<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * <p>This is a best effort load balancer. Given a Cost function F(C) =&gt; x It will<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * randomly try and mutate the cluster to Cprime. If F(Cprime) &lt; F(C) then the<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * new cluster state becomes the plan. It includes costs functions to compute the cost of:</p><a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * <ul><a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * <li>Region Load</li><a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * <li>Table Load</li><a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * <li>Data Locality</li><a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * <li>Memstore Sizes</li><a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * <li>Storefile Sizes</li><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * </ul><a name="line.72"></a> |
| <span class="sourceLineNo">073</span> *<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> *<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * <p>Every cost function returns a number between 0 and 1 inclusive; where 0 is the lowest cost<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * best solution, and 1 is the highest possible cost and the worst solution. The computed costs are<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * scaled by their respective multipliers:</p><a name="line.77"></a> |
| <span class="sourceLineNo">078</span> *<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * <ul><a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * <li>hbase.master.balancer.stochastic.regionLoadCost</li><a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * <li>hbase.master.balancer.stochastic.moveCost</li><a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * <li>hbase.master.balancer.stochastic.tableLoadCost</li><a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * <li>hbase.master.balancer.stochastic.localityCost</li><a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * <li>hbase.master.balancer.stochastic.memstoreSizeCost</li><a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * <li>hbase.master.balancer.stochastic.storefileSizeCost</li><a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * </ul><a name="line.86"></a> |
| <span class="sourceLineNo">087</span> *<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * <p>You can also add custom Cost function by setting the the following configuration value:</p><a name="line.88"></a> |
| <span class="sourceLineNo">089</span> * <ul><a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * <li>hbase.master.balancer.stochastic.additionalCostFunctions</li><a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * </ul><a name="line.91"></a> |
| <span class="sourceLineNo">092</span> *<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * <p>All custom Cost Functions needs to extends {@link StochasticLoadBalancer.CostFunction}</p><a name="line.93"></a> |
| <span class="sourceLineNo">094</span> *<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * <p>In addition to the above configurations, the balancer can be tuned by the following<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> * configuration values:</p><a name="line.96"></a> |
| <span class="sourceLineNo">097</span> * <ul><a name="line.97"></a> |
| <span class="sourceLineNo">098</span> * <li>hbase.master.balancer.stochastic.maxMoveRegions which<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> * controls what the max number of regions that can be moved in a single invocation of this<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * balancer.</li><a name="line.100"></a> |
| <span class="sourceLineNo">101</span> * <li>hbase.master.balancer.stochastic.stepsPerRegion is the coefficient by which the number of<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * regions is multiplied to try and get the number of times the balancer will<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * mutate all servers.</li><a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * <li>hbase.master.balancer.stochastic.maxSteps which controls the maximum number of times that<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * the balancer will try and mutate all the servers. The balancer will use the minimum of this<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * value and the above computation.</li><a name="line.106"></a> |
| <span class="sourceLineNo">107</span> * </ul><a name="line.107"></a> |
| <span class="sourceLineNo">108</span> *<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> * <p>This balancer is best used with hbase.master.loadbalance.bytable set to false<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> * so that the balancer gets the full picture of all loads on the cluster.</p><a name="line.110"></a> |
| <span class="sourceLineNo">111</span> */<a name="line.111"></a> |
| <span class="sourceLineNo">112</span>@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)<a name="line.112"></a> |
| <span class="sourceLineNo">113</span>@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="IS2_INCONSISTENT_SYNC",<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> justification="Complaint is about costFunctions not being synchronized; not end of the world")<a name="line.114"></a> |
| <span class="sourceLineNo">115</span>public class StochasticLoadBalancer extends BaseLoadBalancer {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span><a name="line.116"></a> |
| <span class="sourceLineNo">117</span> protected static final String STEPS_PER_REGION_KEY =<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> "hbase.master.balancer.stochastic.stepsPerRegion";<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> protected static final String MAX_STEPS_KEY =<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> "hbase.master.balancer.stochastic.maxSteps";<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> protected static final String RUN_MAX_STEPS_KEY =<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> "hbase.master.balancer.stochastic.runMaxSteps";<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> protected static final String MAX_RUNNING_TIME_KEY =<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> "hbase.master.balancer.stochastic.maxRunningTime";<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> protected static final String KEEP_REGION_LOADS =<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> "hbase.master.balancer.stochastic.numRegionLoadsToRemember";<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> private static final String TABLE_FUNCTION_SEP = "_";<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> protected static final String MIN_COST_NEED_BALANCE_KEY =<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> "hbase.master.balancer.stochastic.minCostNeedBalance";<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> protected static final String COST_FUNCTIONS_COST_FUNCTIONS_KEY =<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> "hbase.master.balancer.stochastic.additionalCostFunctions";<a name="line.131"></a> |
| <span class="sourceLineNo">132</span><a name="line.132"></a> |
| <span class="sourceLineNo">133</span> protected static final Random RANDOM = new Random(System.currentTimeMillis());<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> private static final Logger LOG = LoggerFactory.getLogger(StochasticLoadBalancer.class);<a name="line.134"></a> |
| <span class="sourceLineNo">135</span><a name="line.135"></a> |
| <span class="sourceLineNo">136</span> Map<String, Deque<BalancerRegionLoad>> loads = new HashMap<>();<a name="line.136"></a> |
| <span class="sourceLineNo">137</span><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> // values are defaults<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> private int maxSteps = 1000000;<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> private boolean runMaxSteps = false;<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> private int stepsPerRegion = 800;<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> private long maxRunningTime = 30 * 1000 * 1; // 30 seconds.<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> private int numRegionLoadsToRemember = 15;<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> private float minCostNeedBalance = 0.05f;<a name="line.144"></a> |
| <span class="sourceLineNo">145</span><a name="line.145"></a> |
| <span class="sourceLineNo">146</span> private List<CandidateGenerator> candidateGenerators;<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> private CostFromRegionLoadFunction[] regionLoadFunctions;<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> private List<CostFunction> costFunctions; // FindBugs: Wants this protected; IS2_INCONSISTENT_SYNC<a name="line.148"></a> |
| <span class="sourceLineNo">149</span><a name="line.149"></a> |
| <span class="sourceLineNo">150</span> // to save and report costs to JMX<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> private Double curOverallCost = 0d;<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> private Double[] tempFunctionCosts;<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> private Double[] curFunctionCosts;<a name="line.153"></a> |
| <span class="sourceLineNo">154</span><a name="line.154"></a> |
| <span class="sourceLineNo">155</span> // Keep locality based picker and cost function to alert them<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> // when new services are offered<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> private LocalityBasedCandidateGenerator localityCandidateGenerator;<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> private ServerLocalityCostFunction localityCost;<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> private RackLocalityCostFunction rackLocalityCost;<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> private RegionReplicaHostCostFunction regionReplicaHostCostFunction;<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> private RegionReplicaRackCostFunction regionReplicaRackCostFunction;<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> private boolean isByTable = false;<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> private TableName tableName = null;<a name="line.163"></a> |
| <span class="sourceLineNo">164</span><a name="line.164"></a> |
| <span class="sourceLineNo">165</span> /**<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> * The constructor that pass a MetricsStochasticBalancer to BaseLoadBalancer to replace its<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> * default MetricsBalancer<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> */<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> public StochasticLoadBalancer() {<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> super(new MetricsStochasticBalancer());<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> }<a name="line.171"></a> |
| <span class="sourceLineNo">172</span><a name="line.172"></a> |
| <span class="sourceLineNo">173</span> @Override<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> public void onConfigurationChange(Configuration conf) {<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> setConf(conf);<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> }<a name="line.176"></a> |
| <span class="sourceLineNo">177</span><a name="line.177"></a> |
| <span class="sourceLineNo">178</span> @Override<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> public synchronized void setConf(Configuration conf) {<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> super.setConf(conf);<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> maxSteps = conf.getInt(MAX_STEPS_KEY, maxSteps);<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> stepsPerRegion = conf.getInt(STEPS_PER_REGION_KEY, stepsPerRegion);<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> maxRunningTime = conf.getLong(MAX_RUNNING_TIME_KEY, maxRunningTime);<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> runMaxSteps = conf.getBoolean(RUN_MAX_STEPS_KEY, runMaxSteps);<a name="line.184"></a> |
| <span class="sourceLineNo">185</span><a name="line.185"></a> |
| <span class="sourceLineNo">186</span> numRegionLoadsToRemember = conf.getInt(KEEP_REGION_LOADS, numRegionLoadsToRemember);<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> isByTable = conf.getBoolean(HConstants.HBASE_MASTER_LOADBALANCE_BYTABLE, isByTable);<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> minCostNeedBalance = conf.getFloat(MIN_COST_NEED_BALANCE_KEY, minCostNeedBalance);<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> if (localityCandidateGenerator == null) {<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> localityCandidateGenerator = new LocalityBasedCandidateGenerator(services);<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> }<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> localityCost = new ServerLocalityCostFunction(conf, services);<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> rackLocalityCost = new RackLocalityCostFunction(conf, services);<a name="line.193"></a> |
| <span class="sourceLineNo">194</span><a name="line.194"></a> |
| <span class="sourceLineNo">195</span> if (this.candidateGenerators == null) {<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> candidateGenerators = Lists.newArrayList();<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> candidateGenerators.add(new RandomCandidateGenerator());<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> candidateGenerators.add(new LoadCandidateGenerator());<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> candidateGenerators.add(localityCandidateGenerator);<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> candidateGenerators.add(new RegionReplicaRackCandidateGenerator());<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> }<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> regionLoadFunctions = new CostFromRegionLoadFunction[] {<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> new ReadRequestCostFunction(conf),<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> new CPRequestCostFunction(conf),<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> new WriteRequestCostFunction(conf),<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> new MemStoreSizeCostFunction(conf),<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> new StoreFileCostFunction(conf)<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> };<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> regionReplicaHostCostFunction = new RegionReplicaHostCostFunction(conf);<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> regionReplicaRackCostFunction = new RegionReplicaRackCostFunction(conf);<a name="line.210"></a> |
| <span class="sourceLineNo">211</span><a name="line.211"></a> |
| <span class="sourceLineNo">212</span> costFunctions = new ArrayList<>();<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> costFunctions.add(new RegionCountSkewCostFunction(conf));<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> costFunctions.add(new PrimaryRegionCountSkewCostFunction(conf));<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> costFunctions.add(new MoveCostFunction(conf));<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> costFunctions.add(localityCost);<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> costFunctions.add(rackLocalityCost);<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> costFunctions.add(new TableSkewCostFunction(conf));<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> costFunctions.add(regionReplicaHostCostFunction);<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> costFunctions.add(regionReplicaRackCostFunction);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> costFunctions.add(regionLoadFunctions[0]);<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> costFunctions.add(regionLoadFunctions[1]);<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> costFunctions.add(regionLoadFunctions[2]);<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> costFunctions.add(regionLoadFunctions[3]);<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> costFunctions.add(regionLoadFunctions[4]);<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> loadCustomCostFunctions(conf);<a name="line.226"></a> |
| <span class="sourceLineNo">227</span><a name="line.227"></a> |
| <span class="sourceLineNo">228</span> curFunctionCosts= new Double[costFunctions.size()];<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> tempFunctionCosts= new Double[costFunctions.size()];<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> LOG.info("Loaded config; maxSteps=" + maxSteps + ", stepsPerRegion=" + stepsPerRegion +<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> ", maxRunningTime=" + maxRunningTime + ", isByTable=" + isByTable + ", CostFunctions=" +<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> Arrays.toString(getCostFunctionNames()) + " etc.");<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> }<a name="line.233"></a> |
| <span class="sourceLineNo">234</span><a name="line.234"></a> |
| <span class="sourceLineNo">235</span> private void loadCustomCostFunctions(Configuration conf) {<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> String[] functionsNames = conf.getStrings(COST_FUNCTIONS_COST_FUNCTIONS_KEY);<a name="line.236"></a> |
| <span class="sourceLineNo">237</span><a name="line.237"></a> |
| <span class="sourceLineNo">238</span> if (null == functionsNames) {<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> return;<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> }<a name="line.240"></a> |
| <span class="sourceLineNo">241</span><a name="line.241"></a> |
| <span class="sourceLineNo">242</span> costFunctions.addAll(Arrays.stream(functionsNames)<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> .map(c -> {<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> Class<? extends CostFunction> klass = null;<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> try {<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> klass = (Class<? extends CostFunction>) Class.forName(c);<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> } catch (ClassNotFoundException e) {<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> LOG.warn("Cannot load class " + c + "': " + e.getMessage());<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> }<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> if (null == klass) {<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> return null;<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> }<a name="line.252"></a> |
| <span class="sourceLineNo">253</span><a name="line.253"></a> |
| <span class="sourceLineNo">254</span> CostFunction reflected = ReflectionUtils.newInstance(klass, conf);<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> LOG.info("Successfully loaded custom CostFunction '" +<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> reflected.getClass().getSimpleName() + "'");<a name="line.256"></a> |
| <span class="sourceLineNo">257</span><a name="line.257"></a> |
| <span class="sourceLineNo">258</span> return reflected;<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> })<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> .filter(Objects::nonNull)<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> .collect(Collectors.toList()));<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> }<a name="line.262"></a> |
| <span class="sourceLineNo">263</span><a name="line.263"></a> |
| <span class="sourceLineNo">264</span> protected void setCandidateGenerators(List<CandidateGenerator> customCandidateGenerators) {<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> this.candidateGenerators = customCandidateGenerators;<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> }<a name="line.266"></a> |
| <span class="sourceLineNo">267</span><a name="line.267"></a> |
| <span class="sourceLineNo">268</span> @Override<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> protected void setSlop(Configuration conf) {<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> this.slop = conf.getFloat("hbase.regions.slop", 0.001F);<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> }<a name="line.271"></a> |
| <span class="sourceLineNo">272</span><a name="line.272"></a> |
| <span class="sourceLineNo">273</span> @Override<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> public synchronized void setClusterMetrics(ClusterMetrics st) {<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> super.setClusterMetrics(st);<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> updateRegionLoad();<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> for(CostFromRegionLoadFunction cost : regionLoadFunctions) {<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> cost.setClusterMetrics(st);<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> }<a name="line.279"></a> |
| <span class="sourceLineNo">280</span><a name="line.280"></a> |
| <span class="sourceLineNo">281</span> // update metrics size<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> try {<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> // by-table or ensemble mode<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> int tablesCount = isByTable ? services.getTableDescriptors().getAll().size() : 1;<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> int functionsCount = getCostFunctionNames().length;<a name="line.285"></a> |
| <span class="sourceLineNo">286</span><a name="line.286"></a> |
| <span class="sourceLineNo">287</span> updateMetricsSize(tablesCount * (functionsCount + 1)); // +1 for overall<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> } catch (Exception e) {<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> LOG.error("failed to get the size of all tables", e);<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> }<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> }<a name="line.291"></a> |
| <span class="sourceLineNo">292</span><a name="line.292"></a> |
| <span class="sourceLineNo">293</span> /**<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> * Update the number of metrics that are reported to JMX<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> */<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> public void updateMetricsSize(int size) {<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> ((MetricsStochasticBalancer) metricsBalancer).updateMetricsSize(size);<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> }<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> }<a name="line.300"></a> |
| <span class="sourceLineNo">301</span><a name="line.301"></a> |
| <span class="sourceLineNo">302</span> @Override<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> public synchronized void setMasterServices(MasterServices masterServices) {<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> super.setMasterServices(masterServices);<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> this.localityCost.setServices(masterServices);<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> this.rackLocalityCost.setServices(masterServices);<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> this.localityCandidateGenerator.setServices(masterServices);<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> }<a name="line.308"></a> |
| <span class="sourceLineNo">309</span><a name="line.309"></a> |
| <span class="sourceLineNo">310</span> @Override<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> protected synchronized boolean areSomeRegionReplicasColocated(Cluster c) {<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> regionReplicaHostCostFunction.init(c);<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> if (regionReplicaHostCostFunction.cost() > 0) return true;<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> regionReplicaRackCostFunction.init(c);<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> if (regionReplicaRackCostFunction.cost() > 0) return true;<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> return false;<a name="line.316"></a> |
| <span class="sourceLineNo">317</span> }<a name="line.317"></a> |
| <span class="sourceLineNo">318</span><a name="line.318"></a> |
| <span class="sourceLineNo">319</span> @Override<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> protected boolean needsBalance(Cluster cluster) {<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> ClusterLoadState cs = new ClusterLoadState(cluster.clusterState);<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> if (cs.getNumServers() < MIN_SERVER_BALANCE) {<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> if (LOG.isDebugEnabled()) {<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> LOG.debug("Not running balancer because only " + cs.getNumServers()<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> + " active regionserver(s)");<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> }<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> return false;<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> }<a name="line.328"></a> |
| <span class="sourceLineNo">329</span> if (areSomeRegionReplicasColocated(cluster)) {<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> return true;<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> }<a name="line.331"></a> |
| <span class="sourceLineNo">332</span><a name="line.332"></a> |
| <span class="sourceLineNo">333</span> double total = 0.0;<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> float sumMultiplier = 0.0f;<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> for (CostFunction c : costFunctions) {<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> float multiplier = c.getMultiplier();<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> if (multiplier <= 0) {<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> continue;<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> }<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> if (!c.isNeeded()) {<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> LOG.debug("{} not needed", c.getClass().getSimpleName());<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> continue;<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> }<a name="line.343"></a> |
| <span class="sourceLineNo">344</span> sumMultiplier += multiplier;<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> total += c.cost() * multiplier;<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> }<a name="line.346"></a> |
| <span class="sourceLineNo">347</span><a name="line.347"></a> |
| <span class="sourceLineNo">348</span> if (total <= 0 || sumMultiplier <= 0<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> || (sumMultiplier > 0 && (total / sumMultiplier) < minCostNeedBalance)) {<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> if (LOG.isTraceEnabled()) {<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> LOG.trace("Skipping load balancing because balanced cluster; " + "total cost is " + total<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> + ", sum multiplier is " + sumMultiplier + " min cost which need balance is "<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> + minCostNeedBalance);<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> }<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> return false;<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> }<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> return true;<a name="line.357"></a> |
| <span class="sourceLineNo">358</span> }<a name="line.358"></a> |
| <span class="sourceLineNo">359</span><a name="line.359"></a> |
| <span class="sourceLineNo">360</span> @Override<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> public synchronized List<RegionPlan> balanceCluster(TableName tableName, Map<ServerName,<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> List<RegionInfo>> clusterState) {<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> this.tableName = tableName;<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> return balanceCluster(clusterState);<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> }<a name="line.365"></a> |
| <span class="sourceLineNo">366</span><a name="line.366"></a> |
| <span class="sourceLineNo">367</span> @VisibleForTesting<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> Cluster.Action nextAction(Cluster cluster) {<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> return candidateGenerators.get(RANDOM.nextInt(candidateGenerators.size()))<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> .generate(cluster);<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> }<a name="line.371"></a> |
| <span class="sourceLineNo">372</span><a name="line.372"></a> |
| <span class="sourceLineNo">373</span> /**<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> * Given the cluster state this will try and approach an optimal balance. This<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> * should always approach the optimal state given enough steps.<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> */<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> @Override<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> public synchronized List<RegionPlan> balanceCluster(Map<ServerName,<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> List<RegionInfo>> clusterState) {<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> List<RegionPlan> plans = balanceMasterRegions(clusterState);<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> if (plans != null || clusterState == null || clusterState.size() <= 1) {<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> return plans;<a name="line.382"></a> |
| <span class="sourceLineNo">383</span> }<a name="line.383"></a> |
| <span class="sourceLineNo">384</span><a name="line.384"></a> |
| <span class="sourceLineNo">385</span> if (masterServerName != null && clusterState.containsKey(masterServerName)) {<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> if (clusterState.size() <= 2) {<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> return null;<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> }<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> clusterState = new HashMap<>(clusterState);<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> clusterState.remove(masterServerName);<a name="line.390"></a> |
| <span class="sourceLineNo">391</span> }<a name="line.391"></a> |
| <span class="sourceLineNo">392</span><a name="line.392"></a> |
| <span class="sourceLineNo">393</span> // On clusters with lots of HFileLinks or lots of reference files,<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> // instantiating the storefile infos can be quite expensive.<a name="line.394"></a> |
| <span class="sourceLineNo">395</span> // Allow turning this feature off if the locality cost is not going to<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> // be used in any computations.<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> RegionLocationFinder finder = null;<a name="line.397"></a> |
| <span class="sourceLineNo">398</span> if ((this.localityCost != null && this.localityCost.getMultiplier() > 0)<a name="line.398"></a> |
| <span class="sourceLineNo">399</span> || (this.rackLocalityCost != null && this.rackLocalityCost.getMultiplier() > 0)) {<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> finder = this.regionFinder;<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> }<a name="line.401"></a> |
| <span class="sourceLineNo">402</span><a name="line.402"></a> |
| <span class="sourceLineNo">403</span> //The clusterState that is given to this method contains the state<a name="line.403"></a> |
| <span class="sourceLineNo">404</span> //of all the regions in the table(s) (that's true today)<a name="line.404"></a> |
| <span class="sourceLineNo">405</span> // Keep track of servers to iterate through them.<a name="line.405"></a> |
| <span class="sourceLineNo">406</span> Cluster cluster = new Cluster(clusterState, loads, finder, rackManager);<a name="line.406"></a> |
| <span class="sourceLineNo">407</span><a name="line.407"></a> |
| <span class="sourceLineNo">408</span> long startTime = EnvironmentEdgeManager.currentTime();<a name="line.408"></a> |
| <span class="sourceLineNo">409</span><a name="line.409"></a> |
| <span class="sourceLineNo">410</span> initCosts(cluster);<a name="line.410"></a> |
| <span class="sourceLineNo">411</span><a name="line.411"></a> |
| <span class="sourceLineNo">412</span> if (!needsBalance(cluster)) {<a name="line.412"></a> |
| <span class="sourceLineNo">413</span> return null;<a name="line.413"></a> |
| <span class="sourceLineNo">414</span> }<a name="line.414"></a> |
| <span class="sourceLineNo">415</span><a name="line.415"></a> |
| <span class="sourceLineNo">416</span> double currentCost = computeCost(cluster, Double.MAX_VALUE);<a name="line.416"></a> |
| <span class="sourceLineNo">417</span> curOverallCost = currentCost;<a name="line.417"></a> |
| <span class="sourceLineNo">418</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.418"></a> |
| <span class="sourceLineNo">419</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.419"></a> |
| <span class="sourceLineNo">420</span> }<a name="line.420"></a> |
| <span class="sourceLineNo">421</span> double initCost = currentCost;<a name="line.421"></a> |
| <span class="sourceLineNo">422</span> double newCost = currentCost;<a name="line.422"></a> |
| <span class="sourceLineNo">423</span><a name="line.423"></a> |
| <span class="sourceLineNo">424</span> long computedMaxSteps;<a name="line.424"></a> |
| <span class="sourceLineNo">425</span> if (runMaxSteps) {<a name="line.425"></a> |
| <span class="sourceLineNo">426</span> computedMaxSteps = Math.max(this.maxSteps,<a name="line.426"></a> |
| <span class="sourceLineNo">427</span> ((long)cluster.numRegions * (long)this.stepsPerRegion * (long)cluster.numServers));<a name="line.427"></a> |
| <span class="sourceLineNo">428</span> } else {<a name="line.428"></a> |
| <span class="sourceLineNo">429</span> long calculatedMaxSteps = (long)cluster.numRegions * (long)this.stepsPerRegion *<a name="line.429"></a> |
| <span class="sourceLineNo">430</span> (long)cluster.numServers;<a name="line.430"></a> |
| <span class="sourceLineNo">431</span> computedMaxSteps = Math.min(this.maxSteps, calculatedMaxSteps);<a name="line.431"></a> |
| <span class="sourceLineNo">432</span> if (calculatedMaxSteps > maxSteps) {<a name="line.432"></a> |
| <span class="sourceLineNo">433</span> LOG.warn("calculatedMaxSteps:{} for loadbalancer's stochastic walk is larger than "<a name="line.433"></a> |
| <span class="sourceLineNo">434</span> + "maxSteps:{}. Hence load balancing may not work well. Setting parameter "<a name="line.434"></a> |
| <span class="sourceLineNo">435</span> + "\"hbase.master.balancer.stochastic.runMaxSteps\" to true can overcome this issue."<a name="line.435"></a> |
| <span class="sourceLineNo">436</span> + "(This config change does not require service restart)", calculatedMaxSteps,<a name="line.436"></a> |
| <span class="sourceLineNo">437</span> maxSteps);<a name="line.437"></a> |
| <span class="sourceLineNo">438</span> }<a name="line.438"></a> |
| <span class="sourceLineNo">439</span> }<a name="line.439"></a> |
| <span class="sourceLineNo">440</span> LOG.info("start StochasticLoadBalancer.balancer, initCost=" + currentCost + ", functionCost="<a name="line.440"></a> |
| <span class="sourceLineNo">441</span> + functionCost() + " computedMaxSteps: " + computedMaxSteps);<a name="line.441"></a> |
| <span class="sourceLineNo">442</span><a name="line.442"></a> |
| <span class="sourceLineNo">443</span> // Perform a stochastic walk to see if we can get a good fit.<a name="line.443"></a> |
| <span class="sourceLineNo">444</span> long step;<a name="line.444"></a> |
| <span class="sourceLineNo">445</span><a name="line.445"></a> |
| <span class="sourceLineNo">446</span> for (step = 0; step < computedMaxSteps; step++) {<a name="line.446"></a> |
| <span class="sourceLineNo">447</span> Cluster.Action action = nextAction(cluster);<a name="line.447"></a> |
| <span class="sourceLineNo">448</span><a name="line.448"></a> |
| <span class="sourceLineNo">449</span> if (action.type == Type.NULL) {<a name="line.449"></a> |
| <span class="sourceLineNo">450</span> continue;<a name="line.450"></a> |
| <span class="sourceLineNo">451</span> }<a name="line.451"></a> |
| <span class="sourceLineNo">452</span><a name="line.452"></a> |
| <span class="sourceLineNo">453</span> cluster.doAction(action);<a name="line.453"></a> |
| <span class="sourceLineNo">454</span> updateCostsWithAction(cluster, action);<a name="line.454"></a> |
| <span class="sourceLineNo">455</span><a name="line.455"></a> |
| <span class="sourceLineNo">456</span> newCost = computeCost(cluster, currentCost);<a name="line.456"></a> |
| <span class="sourceLineNo">457</span><a name="line.457"></a> |
| <span class="sourceLineNo">458</span> // Should this be kept?<a name="line.458"></a> |
| <span class="sourceLineNo">459</span> if (newCost < currentCost) {<a name="line.459"></a> |
| <span class="sourceLineNo">460</span> currentCost = newCost;<a name="line.460"></a> |
| <span class="sourceLineNo">461</span><a name="line.461"></a> |
| <span class="sourceLineNo">462</span> // save for JMX<a name="line.462"></a> |
| <span class="sourceLineNo">463</span> curOverallCost = currentCost;<a name="line.463"></a> |
| <span class="sourceLineNo">464</span> for (int i = 0; i < this.curFunctionCosts.length; i++) {<a name="line.464"></a> |
| <span class="sourceLineNo">465</span> curFunctionCosts[i] = tempFunctionCosts[i];<a name="line.465"></a> |
| <span class="sourceLineNo">466</span> }<a name="line.466"></a> |
| <span class="sourceLineNo">467</span> } else {<a name="line.467"></a> |
| <span class="sourceLineNo">468</span> // Put things back the way they were before.<a name="line.468"></a> |
| <span class="sourceLineNo">469</span> // TODO: undo by remembering old values<a name="line.469"></a> |
| <span class="sourceLineNo">470</span> Action undoAction = action.undoAction();<a name="line.470"></a> |
| <span class="sourceLineNo">471</span> cluster.doAction(undoAction);<a name="line.471"></a> |
| <span class="sourceLineNo">472</span> updateCostsWithAction(cluster, undoAction);<a name="line.472"></a> |
| <span class="sourceLineNo">473</span> }<a name="line.473"></a> |
| <span class="sourceLineNo">474</span><a name="line.474"></a> |
| <span class="sourceLineNo">475</span> if (EnvironmentEdgeManager.currentTime() - startTime ><a name="line.475"></a> |
| <span class="sourceLineNo">476</span> maxRunningTime) {<a name="line.476"></a> |
| <span class="sourceLineNo">477</span> break;<a name="line.477"></a> |
| <span class="sourceLineNo">478</span> }<a name="line.478"></a> |
| <span class="sourceLineNo">479</span> }<a name="line.479"></a> |
| <span class="sourceLineNo">480</span> long endTime = EnvironmentEdgeManager.currentTime();<a name="line.480"></a> |
| <span class="sourceLineNo">481</span><a name="line.481"></a> |
| <span class="sourceLineNo">482</span> metricsBalancer.balanceCluster(endTime - startTime);<a name="line.482"></a> |
| <span class="sourceLineNo">483</span><a name="line.483"></a> |
| <span class="sourceLineNo">484</span> // update costs metrics<a name="line.484"></a> |
| <span class="sourceLineNo">485</span> updateStochasticCosts(tableName, curOverallCost, curFunctionCosts);<a name="line.485"></a> |
| <span class="sourceLineNo">486</span> if (initCost > currentCost) {<a name="line.486"></a> |
| <span class="sourceLineNo">487</span> plans = createRegionPlans(cluster);<a name="line.487"></a> |
| <span class="sourceLineNo">488</span> LOG.info("Finished computing new load balance plan. Computation took {}" +<a name="line.488"></a> |
| <span class="sourceLineNo">489</span> " to try {} different iterations. Found a solution that moves " +<a name="line.489"></a> |
| <span class="sourceLineNo">490</span> "{} regions; Going from a computed cost of {}" +<a name="line.490"></a> |
| <span class="sourceLineNo">491</span> " to a new cost of {}", java.time.Duration.ofMillis(endTime - startTime),<a name="line.491"></a> |
| <span class="sourceLineNo">492</span> step, plans.size(), initCost, currentCost);<a name="line.492"></a> |
| <span class="sourceLineNo">493</span> return plans;<a name="line.493"></a> |
| <span class="sourceLineNo">494</span> }<a name="line.494"></a> |
| <span class="sourceLineNo">495</span> LOG.info("Could not find a better load balance plan. Tried {} different configurations in " +<a name="line.495"></a> |
| <span class="sourceLineNo">496</span> "{}, and did not find anything with a computed cost less than {}", step,<a name="line.496"></a> |
| <span class="sourceLineNo">497</span> java.time.Duration.ofMillis(endTime - startTime), initCost);<a name="line.497"></a> |
| <span class="sourceLineNo">498</span> return null;<a name="line.498"></a> |
| <span class="sourceLineNo">499</span> }<a name="line.499"></a> |
| <span class="sourceLineNo">500</span><a name="line.500"></a> |
| <span class="sourceLineNo">501</span> /**<a name="line.501"></a> |
| <span class="sourceLineNo">502</span> * update costs to JMX<a name="line.502"></a> |
| <span class="sourceLineNo">503</span> */<a name="line.503"></a> |
| <span class="sourceLineNo">504</span> private void updateStochasticCosts(TableName tableName, Double overall, Double[] subCosts) {<a name="line.504"></a> |
| <span class="sourceLineNo">505</span> if (tableName == null) return;<a name="line.505"></a> |
| <span class="sourceLineNo">506</span><a name="line.506"></a> |
| <span class="sourceLineNo">507</span> // check if the metricsBalancer is MetricsStochasticBalancer before casting<a name="line.507"></a> |
| <span class="sourceLineNo">508</span> if (metricsBalancer instanceof MetricsStochasticBalancer) {<a name="line.508"></a> |
| <span class="sourceLineNo">509</span> MetricsStochasticBalancer balancer = (MetricsStochasticBalancer) metricsBalancer;<a name="line.509"></a> |
| <span class="sourceLineNo">510</span> // overall cost<a name="line.510"></a> |
| <span class="sourceLineNo">511</span> balancer.updateStochasticCost(tableName.getNameAsString(),<a name="line.511"></a> |
| <span class="sourceLineNo">512</span> "Overall", "Overall cost", overall);<a name="line.512"></a> |
| <span class="sourceLineNo">513</span><a name="line.513"></a> |
| <span class="sourceLineNo">514</span> // each cost function<a name="line.514"></a> |
| <span class="sourceLineNo">515</span> for (int i = 0; i < costFunctions.size(); i++) {<a name="line.515"></a> |
| <span class="sourceLineNo">516</span> CostFunction costFunction = costFunctions.get(i);<a name="line.516"></a> |
| <span class="sourceLineNo">517</span> String costFunctionName = costFunction.getClass().getSimpleName();<a name="line.517"></a> |
| <span class="sourceLineNo">518</span> Double costPercent = (overall == 0) ? 0 : (subCosts[i] / overall);<a name="line.518"></a> |
| <span class="sourceLineNo">519</span> // TODO: cost function may need a specific description<a name="line.519"></a> |
| <span class="sourceLineNo">520</span> balancer.updateStochasticCost(tableName.getNameAsString(), costFunctionName,<a name="line.520"></a> |
| <span class="sourceLineNo">521</span> "The percent of " + costFunctionName, costPercent);<a name="line.521"></a> |
| <span class="sourceLineNo">522</span> }<a name="line.522"></a> |
| <span class="sourceLineNo">523</span> }<a name="line.523"></a> |
| <span class="sourceLineNo">524</span> }<a name="line.524"></a> |
| <span class="sourceLineNo">525</span><a name="line.525"></a> |
| <span class="sourceLineNo">526</span> private String functionCost() {<a name="line.526"></a> |
| <span class="sourceLineNo">527</span> StringBuilder builder = new StringBuilder();<a name="line.527"></a> |
| <span class="sourceLineNo">528</span> for (CostFunction c:costFunctions) {<a name="line.528"></a> |
| <span class="sourceLineNo">529</span> builder.append(c.getClass().getSimpleName());<a name="line.529"></a> |
| <span class="sourceLineNo">530</span> builder.append(" : (");<a name="line.530"></a> |
| <span class="sourceLineNo">531</span> builder.append(c.getMultiplier());<a name="line.531"></a> |
| <span class="sourceLineNo">532</span> builder.append(", ");<a name="line.532"></a> |
| <span class="sourceLineNo">533</span> builder.append(c.cost());<a name="line.533"></a> |
| <span class="sourceLineNo">534</span> builder.append("); ");<a name="line.534"></a> |
| <span class="sourceLineNo">535</span> }<a name="line.535"></a> |
| <span class="sourceLineNo">536</span> return builder.toString();<a name="line.536"></a> |
| <span class="sourceLineNo">537</span> }<a name="line.537"></a> |
| <span class="sourceLineNo">538</span><a name="line.538"></a> |
| <span class="sourceLineNo">539</span> /**<a name="line.539"></a> |
| <span class="sourceLineNo">540</span> * Create all of the RegionPlan's needed to move from the initial cluster state to the desired<a name="line.540"></a> |
| <span class="sourceLineNo">541</span> * state.<a name="line.541"></a> |
| <span class="sourceLineNo">542</span> *<a name="line.542"></a> |
| <span class="sourceLineNo">543</span> * @param cluster The state of the cluster<a name="line.543"></a> |
| <span class="sourceLineNo">544</span> * @return List of RegionPlan's that represent the moves needed to get to desired final state.<a name="line.544"></a> |
| <span class="sourceLineNo">545</span> */<a name="line.545"></a> |
| <span class="sourceLineNo">546</span> private List<RegionPlan> createRegionPlans(Cluster cluster) {<a name="line.546"></a> |
| <span class="sourceLineNo">547</span> List<RegionPlan> plans = new LinkedList<>();<a name="line.547"></a> |
| <span class="sourceLineNo">548</span> for (int regionIndex = 0;<a name="line.548"></a> |
| <span class="sourceLineNo">549</span> regionIndex < cluster.regionIndexToServerIndex.length; regionIndex++) {<a name="line.549"></a> |
| <span class="sourceLineNo">550</span> int initialServerIndex = cluster.initialRegionIndexToServerIndex[regionIndex];<a name="line.550"></a> |
| <span class="sourceLineNo">551</span> int newServerIndex = cluster.regionIndexToServerIndex[regionIndex];<a name="line.551"></a> |
| <span class="sourceLineNo">552</span><a name="line.552"></a> |
| <span class="sourceLineNo">553</span> if (initialServerIndex != newServerIndex) {<a name="line.553"></a> |
| <span class="sourceLineNo">554</span> RegionInfo region = cluster.regions[regionIndex];<a name="line.554"></a> |
| <span class="sourceLineNo">555</span> ServerName initialServer = cluster.servers[initialServerIndex];<a name="line.555"></a> |
| <span class="sourceLineNo">556</span> ServerName newServer = cluster.servers[newServerIndex];<a name="line.556"></a> |
| <span class="sourceLineNo">557</span><a name="line.557"></a> |
| <span class="sourceLineNo">558</span> if (LOG.isTraceEnabled()) {<a name="line.558"></a> |
| <span class="sourceLineNo">559</span> LOG.trace("Moving Region " + region.getEncodedName() + " from server "<a name="line.559"></a> |
| <span class="sourceLineNo">560</span> + initialServer.getHostname() + " to " + newServer.getHostname());<a name="line.560"></a> |
| <span class="sourceLineNo">561</span> }<a name="line.561"></a> |
| <span class="sourceLineNo">562</span> RegionPlan rp = new RegionPlan(region, initialServer, newServer);<a name="line.562"></a> |
| <span class="sourceLineNo">563</span> plans.add(rp);<a name="line.563"></a> |
| <span class="sourceLineNo">564</span> }<a name="line.564"></a> |
| <span class="sourceLineNo">565</span> }<a name="line.565"></a> |
| <span class="sourceLineNo">566</span> return plans;<a name="line.566"></a> |
| <span class="sourceLineNo">567</span> }<a name="line.567"></a> |
| <span class="sourceLineNo">568</span><a name="line.568"></a> |
| <span class="sourceLineNo">569</span> /**<a name="line.569"></a> |
| <span class="sourceLineNo">570</span> * Store the current region loads.<a name="line.570"></a> |
| <span class="sourceLineNo">571</span> */<a name="line.571"></a> |
| <span class="sourceLineNo">572</span> private synchronized void updateRegionLoad() {<a name="line.572"></a> |
| <span class="sourceLineNo">573</span> // We create a new hashmap so that regions that are no longer there are removed.<a name="line.573"></a> |
| <span class="sourceLineNo">574</span> // However we temporarily need the old loads so we can use them to keep the rolling average.<a name="line.574"></a> |
| <span class="sourceLineNo">575</span> Map<String, Deque<BalancerRegionLoad>> oldLoads = loads;<a name="line.575"></a> |
| <span class="sourceLineNo">576</span> loads = new HashMap<>();<a name="line.576"></a> |
| <span class="sourceLineNo">577</span><a name="line.577"></a> |
| <span class="sourceLineNo">578</span> clusterStatus.getLiveServerMetrics().forEach((ServerName sn, ServerMetrics sm) -> {<a name="line.578"></a> |
| <span class="sourceLineNo">579</span> sm.getRegionMetrics().forEach((byte[] regionName, RegionMetrics rm) -> {<a name="line.579"></a> |
| <span class="sourceLineNo">580</span> String regionNameAsString = RegionInfo.getRegionNameAsString(regionName);<a name="line.580"></a> |
| <span class="sourceLineNo">581</span> Deque<BalancerRegionLoad> rLoads = oldLoads.get(regionNameAsString);<a name="line.581"></a> |
| <span class="sourceLineNo">582</span> if (rLoads == null) {<a name="line.582"></a> |
| <span class="sourceLineNo">583</span> rLoads = new ArrayDeque<>(numRegionLoadsToRemember + 1);<a name="line.583"></a> |
| <span class="sourceLineNo">584</span> } else if (rLoads.size() >= numRegionLoadsToRemember) {<a name="line.584"></a> |
| <span class="sourceLineNo">585</span> rLoads.remove();<a name="line.585"></a> |
| <span class="sourceLineNo">586</span> }<a name="line.586"></a> |
| <span class="sourceLineNo">587</span> rLoads.add(new BalancerRegionLoad(rm));<a name="line.587"></a> |
| <span class="sourceLineNo">588</span> loads.put(regionNameAsString, rLoads);<a name="line.588"></a> |
| <span class="sourceLineNo">589</span> });<a name="line.589"></a> |
| <span class="sourceLineNo">590</span> });<a name="line.590"></a> |
| <span class="sourceLineNo">591</span><a name="line.591"></a> |
| <span class="sourceLineNo">592</span> for(CostFromRegionLoadFunction cost : regionLoadFunctions) {<a name="line.592"></a> |
| <span class="sourceLineNo">593</span> cost.setLoads(loads);<a name="line.593"></a> |
| <span class="sourceLineNo">594</span> }<a name="line.594"></a> |
| <span class="sourceLineNo">595</span> }<a name="line.595"></a> |
| <span class="sourceLineNo">596</span><a name="line.596"></a> |
| <span class="sourceLineNo">597</span> protected void initCosts(Cluster cluster) {<a name="line.597"></a> |
| <span class="sourceLineNo">598</span> for (CostFunction c:costFunctions) {<a name="line.598"></a> |
| <span class="sourceLineNo">599</span> c.init(cluster);<a name="line.599"></a> |
| <span class="sourceLineNo">600</span> }<a name="line.600"></a> |
| <span class="sourceLineNo">601</span> }<a name="line.601"></a> |
| <span class="sourceLineNo">602</span><a name="line.602"></a> |
| <span class="sourceLineNo">603</span> protected void updateCostsWithAction(Cluster cluster, Action action) {<a name="line.603"></a> |
| <span class="sourceLineNo">604</span> for (CostFunction c : costFunctions) {<a name="line.604"></a> |
| <span class="sourceLineNo">605</span> c.postAction(action);<a name="line.605"></a> |
| <span class="sourceLineNo">606</span> }<a name="line.606"></a> |
| <span class="sourceLineNo">607</span> }<a name="line.607"></a> |
| <span class="sourceLineNo">608</span><a name="line.608"></a> |
| <span class="sourceLineNo">609</span> /**<a name="line.609"></a> |
| <span class="sourceLineNo">610</span> * Get the names of the cost functions<a name="line.610"></a> |
| <span class="sourceLineNo">611</span> */<a name="line.611"></a> |
| <span class="sourceLineNo">612</span> public String[] getCostFunctionNames() {<a name="line.612"></a> |
| <span class="sourceLineNo">613</span> if (costFunctions == null) return null;<a name="line.613"></a> |
| <span class="sourceLineNo">614</span> String[] ret = new String[costFunctions.size()];<a name="line.614"></a> |
| <span class="sourceLineNo">615</span> for (int i = 0; i < costFunctions.size(); i++) {<a name="line.615"></a> |
| <span class="sourceLineNo">616</span> CostFunction c = costFunctions.get(i);<a name="line.616"></a> |
| <span class="sourceLineNo">617</span> ret[i] = c.getClass().getSimpleName();<a name="line.617"></a> |
| <span class="sourceLineNo">618</span> }<a name="line.618"></a> |
| <span class="sourceLineNo">619</span><a name="line.619"></a> |
| <span class="sourceLineNo">620</span> return ret;<a name="line.620"></a> |
| <span class="sourceLineNo">621</span> }<a name="line.621"></a> |
| <span class="sourceLineNo">622</span><a name="line.622"></a> |
| <span class="sourceLineNo">623</span> /**<a name="line.623"></a> |
| <span class="sourceLineNo">624</span> * This is the main cost function. It will compute a cost associated with a proposed cluster<a name="line.624"></a> |
| <span class="sourceLineNo">625</span> * state. All different costs will be combined with their multipliers to produce a double cost.<a name="line.625"></a> |
| <span class="sourceLineNo">626</span> *<a name="line.626"></a> |
| <span class="sourceLineNo">627</span> * @param cluster The state of the cluster<a name="line.627"></a> |
| <span class="sourceLineNo">628</span> * @param previousCost the previous cost. This is used as an early out.<a name="line.628"></a> |
| <span class="sourceLineNo">629</span> * @return a double of a cost associated with the proposed cluster state. This cost is an<a name="line.629"></a> |
| <span class="sourceLineNo">630</span> * aggregate of all individual cost functions.<a name="line.630"></a> |
| <span class="sourceLineNo">631</span> */<a name="line.631"></a> |
| <span class="sourceLineNo">632</span> protected double computeCost(Cluster cluster, double previousCost) {<a name="line.632"></a> |
| <span class="sourceLineNo">633</span> double total = 0;<a name="line.633"></a> |
| <span class="sourceLineNo">634</span><a name="line.634"></a> |
| <span class="sourceLineNo">635</span> for (int i = 0; i < costFunctions.size(); i++) {<a name="line.635"></a> |
| <span class="sourceLineNo">636</span> CostFunction c = costFunctions.get(i);<a name="line.636"></a> |
| <span class="sourceLineNo">637</span> this.tempFunctionCosts[i] = 0.0;<a name="line.637"></a> |
| <span class="sourceLineNo">638</span><a name="line.638"></a> |
| <span class="sourceLineNo">639</span> if (c.getMultiplier() <= 0) {<a name="line.639"></a> |
| <span class="sourceLineNo">640</span> continue;<a name="line.640"></a> |
| <span class="sourceLineNo">641</span> }<a name="line.641"></a> |
| <span class="sourceLineNo">642</span><a name="line.642"></a> |
| <span class="sourceLineNo">643</span> Float multiplier = c.getMultiplier();<a name="line.643"></a> |
| <span class="sourceLineNo">644</span> Double cost = c.cost();<a name="line.644"></a> |
| <span class="sourceLineNo">645</span><a name="line.645"></a> |
| <span class="sourceLineNo">646</span> this.tempFunctionCosts[i] = multiplier*cost;<a name="line.646"></a> |
| <span class="sourceLineNo">647</span> total += this.tempFunctionCosts[i];<a name="line.647"></a> |
| <span class="sourceLineNo">648</span><a name="line.648"></a> |
| <span class="sourceLineNo">649</span> if (total > previousCost) {<a name="line.649"></a> |
| <span class="sourceLineNo">650</span> break;<a name="line.650"></a> |
| <span class="sourceLineNo">651</span> }<a name="line.651"></a> |
| <span class="sourceLineNo">652</span> }<a name="line.652"></a> |
| <span class="sourceLineNo">653</span><a name="line.653"></a> |
| <span class="sourceLineNo">654</span> return total;<a name="line.654"></a> |
| <span class="sourceLineNo">655</span> }<a name="line.655"></a> |
| <span class="sourceLineNo">656</span><a name="line.656"></a> |
| <span class="sourceLineNo">657</span> /** Generates a candidate action to be applied to the cluster for cost function search */<a name="line.657"></a> |
| <span class="sourceLineNo">658</span> abstract static class CandidateGenerator {<a name="line.658"></a> |
| <span class="sourceLineNo">659</span> abstract Cluster.Action generate(Cluster cluster);<a name="line.659"></a> |
| <span class="sourceLineNo">660</span><a name="line.660"></a> |
| <span class="sourceLineNo">661</span> /**<a name="line.661"></a> |
| <span class="sourceLineNo">662</span> * From a list of regions pick a random one. Null can be returned which<a name="line.662"></a> |
| <span class="sourceLineNo">663</span> * {@link StochasticLoadBalancer#balanceCluster(Map)} recognize as signal to try a region move<a name="line.663"></a> |
| <span class="sourceLineNo">664</span> * rather than swap.<a name="line.664"></a> |
| <span class="sourceLineNo">665</span> *<a name="line.665"></a> |
| <span class="sourceLineNo">666</span> * @param cluster The state of the cluster<a name="line.666"></a> |
| <span class="sourceLineNo">667</span> * @param server index of the server<a name="line.667"></a> |
| <span class="sourceLineNo">668</span> * @param chanceOfNoSwap Chance that this will decide to try a move rather<a name="line.668"></a> |
| <span class="sourceLineNo">669</span> * than a swap.<a name="line.669"></a> |
| <span class="sourceLineNo">670</span> * @return a random {@link RegionInfo} or null if an asymmetrical move is<a name="line.670"></a> |
| <span class="sourceLineNo">671</span> * suggested.<a name="line.671"></a> |
| <span class="sourceLineNo">672</span> */<a name="line.672"></a> |
| <span class="sourceLineNo">673</span> protected int pickRandomRegion(Cluster cluster, int server, double chanceOfNoSwap) {<a name="line.673"></a> |
| <span class="sourceLineNo">674</span> // Check to see if this is just a move.<a name="line.674"></a> |
| <span class="sourceLineNo">675</span> if (cluster.regionsPerServer[server].length == 0 || RANDOM.nextFloat() < chanceOfNoSwap) {<a name="line.675"></a> |
| <span class="sourceLineNo">676</span> // signal a move only.<a name="line.676"></a> |
| <span class="sourceLineNo">677</span> return -1;<a name="line.677"></a> |
| <span class="sourceLineNo">678</span> }<a name="line.678"></a> |
| <span class="sourceLineNo">679</span> int rand = RANDOM.nextInt(cluster.regionsPerServer[server].length);<a name="line.679"></a> |
| <span class="sourceLineNo">680</span> return cluster.regionsPerServer[server][rand];<a name="line.680"></a> |
| <span class="sourceLineNo">681</span><a name="line.681"></a> |
| <span class="sourceLineNo">682</span> }<a name="line.682"></a> |
| <span class="sourceLineNo">683</span> protected int pickRandomServer(Cluster cluster) {<a name="line.683"></a> |
| <span class="sourceLineNo">684</span> if (cluster.numServers < 1) {<a name="line.684"></a> |
| <span class="sourceLineNo">685</span> return -1;<a name="line.685"></a> |
| <span class="sourceLineNo">686</span> }<a name="line.686"></a> |
| <span class="sourceLineNo">687</span><a name="line.687"></a> |
| <span class="sourceLineNo">688</span> return RANDOM.nextInt(cluster.numServers);<a name="line.688"></a> |
| <span class="sourceLineNo">689</span> }<a name="line.689"></a> |
| <span class="sourceLineNo">690</span><a name="line.690"></a> |
| <span class="sourceLineNo">691</span> protected int pickRandomRack(Cluster cluster) {<a name="line.691"></a> |
| <span class="sourceLineNo">692</span> if (cluster.numRacks < 1) {<a name="line.692"></a> |
| <span class="sourceLineNo">693</span> return -1;<a name="line.693"></a> |
| <span class="sourceLineNo">694</span> }<a name="line.694"></a> |
| <span class="sourceLineNo">695</span><a name="line.695"></a> |
| <span class="sourceLineNo">696</span> return RANDOM.nextInt(cluster.numRacks);<a name="line.696"></a> |
| <span class="sourceLineNo">697</span> }<a name="line.697"></a> |
| <span class="sourceLineNo">698</span><a name="line.698"></a> |
| <span class="sourceLineNo">699</span> protected int pickOtherRandomServer(Cluster cluster, int serverIndex) {<a name="line.699"></a> |
| <span class="sourceLineNo">700</span> if (cluster.numServers < 2) {<a name="line.700"></a> |
| <span class="sourceLineNo">701</span> return -1;<a name="line.701"></a> |
| <span class="sourceLineNo">702</span> }<a name="line.702"></a> |
| <span class="sourceLineNo">703</span> while (true) {<a name="line.703"></a> |
| <span class="sourceLineNo">704</span> int otherServerIndex = pickRandomServer(cluster);<a name="line.704"></a> |
| <span class="sourceLineNo">705</span> if (otherServerIndex != serverIndex) {<a name="line.705"></a> |
| <span class="sourceLineNo">706</span> return otherServerIndex;<a name="line.706"></a> |
| <span class="sourceLineNo">707</span> }<a name="line.707"></a> |
| <span class="sourceLineNo">708</span> }<a name="line.708"></a> |
| <span class="sourceLineNo">709</span> }<a name="line.709"></a> |
| <span class="sourceLineNo">710</span><a name="line.710"></a> |
| <span class="sourceLineNo">711</span> protected int pickOtherRandomRack(Cluster cluster, int rackIndex) {<a name="line.711"></a> |
| <span class="sourceLineNo">712</span> if (cluster.numRacks < 2) {<a name="line.712"></a> |
| <span class="sourceLineNo">713</span> return -1;<a name="line.713"></a> |
| <span class="sourceLineNo">714</span> }<a name="line.714"></a> |
| <span class="sourceLineNo">715</span> while (true) {<a name="line.715"></a> |
| <span class="sourceLineNo">716</span> int otherRackIndex = pickRandomRack(cluster);<a name="line.716"></a> |
| <span class="sourceLineNo">717</span> if (otherRackIndex != rackIndex) {<a name="line.717"></a> |
| <span class="sourceLineNo">718</span> return otherRackIndex;<a name="line.718"></a> |
| <span class="sourceLineNo">719</span> }<a name="line.719"></a> |
| <span class="sourceLineNo">720</span> }<a name="line.720"></a> |
| <span class="sourceLineNo">721</span> }<a name="line.721"></a> |
| <span class="sourceLineNo">722</span><a name="line.722"></a> |
| <span class="sourceLineNo">723</span> protected Cluster.Action pickRandomRegions(Cluster cluster,<a name="line.723"></a> |
| <span class="sourceLineNo">724</span> int thisServer,<a name="line.724"></a> |
| <span class="sourceLineNo">725</span> int otherServer) {<a name="line.725"></a> |
| <span class="sourceLineNo">726</span> if (thisServer < 0 || otherServer < 0) {<a name="line.726"></a> |
| <span class="sourceLineNo">727</span> return Cluster.NullAction;<a name="line.727"></a> |
| <span class="sourceLineNo">728</span> }<a name="line.728"></a> |
| <span class="sourceLineNo">729</span><a name="line.729"></a> |
| <span class="sourceLineNo">730</span> // Decide who is most likely to need another region<a name="line.730"></a> |
| <span class="sourceLineNo">731</span> int thisRegionCount = cluster.getNumRegions(thisServer);<a name="line.731"></a> |
| <span class="sourceLineNo">732</span> int otherRegionCount = cluster.getNumRegions(otherServer);<a name="line.732"></a> |
| <span class="sourceLineNo">733</span><a name="line.733"></a> |
| <span class="sourceLineNo">734</span> // Assign the chance based upon the above<a name="line.734"></a> |
| <span class="sourceLineNo">735</span> double thisChance = (thisRegionCount > otherRegionCount) ? 0 : 0.5;<a name="line.735"></a> |
| <span class="sourceLineNo">736</span> double otherChance = (thisRegionCount <= otherRegionCount) ? 0 : 0.5;<a name="line.736"></a> |
| <span class="sourceLineNo">737</span><a name="line.737"></a> |
| <span class="sourceLineNo">738</span> int thisRegion = pickRandomRegion(cluster, thisServer, thisChance);<a name="line.738"></a> |
| <span class="sourceLineNo">739</span> int otherRegion = pickRandomRegion(cluster, otherServer, otherChance);<a name="line.739"></a> |
| <span class="sourceLineNo">740</span><a name="line.740"></a> |
| <span class="sourceLineNo">741</span> return getAction(thisServer, thisRegion, otherServer, otherRegion);<a name="line.741"></a> |
| <span class="sourceLineNo">742</span> }<a name="line.742"></a> |
| <span class="sourceLineNo">743</span><a name="line.743"></a> |
| <span class="sourceLineNo">744</span> protected Cluster.Action getAction(int fromServer, int fromRegion,<a name="line.744"></a> |
| <span class="sourceLineNo">745</span> int toServer, int toRegion) {<a name="line.745"></a> |
| <span class="sourceLineNo">746</span> if (fromServer < 0 || toServer < 0) {<a name="line.746"></a> |
| <span class="sourceLineNo">747</span> return Cluster.NullAction;<a name="line.747"></a> |
| <span class="sourceLineNo">748</span> }<a name="line.748"></a> |
| <span class="sourceLineNo">749</span> if (fromRegion > 0 && toRegion > 0) {<a name="line.749"></a> |
| <span class="sourceLineNo">750</span> return new Cluster.SwapRegionsAction(fromServer, fromRegion,<a name="line.750"></a> |
| <span class="sourceLineNo">751</span> toServer, toRegion);<a name="line.751"></a> |
| <span class="sourceLineNo">752</span> } else if (fromRegion > 0) {<a name="line.752"></a> |
| <span class="sourceLineNo">753</span> return new Cluster.MoveRegionAction(fromRegion, fromServer, toServer);<a name="line.753"></a> |
| <span class="sourceLineNo">754</span> } else if (toRegion > 0) {<a name="line.754"></a> |
| <span class="sourceLineNo">755</span> return new Cluster.MoveRegionAction(toRegion, toServer, fromServer);<a name="line.755"></a> |
| <span class="sourceLineNo">756</span> } else {<a name="line.756"></a> |
| <span class="sourceLineNo">757</span> return Cluster.NullAction;<a name="line.757"></a> |
| <span class="sourceLineNo">758</span> }<a name="line.758"></a> |
| <span class="sourceLineNo">759</span> }<a name="line.759"></a> |
| <span class="sourceLineNo">760</span><a name="line.760"></a> |
| <span class="sourceLineNo">761</span> /**<a name="line.761"></a> |
| <span class="sourceLineNo">762</span> * Returns a random iteration order of indexes of an array with size length<a name="line.762"></a> |
| <span class="sourceLineNo">763</span> */<a name="line.763"></a> |
| <span class="sourceLineNo">764</span> protected List<Integer> getRandomIterationOrder(int length) {<a name="line.764"></a> |
| <span class="sourceLineNo">765</span> ArrayList<Integer> order = new ArrayList<>(length);<a name="line.765"></a> |
| <span class="sourceLineNo">766</span> for (int i = 0; i < length; i++) {<a name="line.766"></a> |
| <span class="sourceLineNo">767</span> order.add(i);<a name="line.767"></a> |
| <span class="sourceLineNo">768</span> }<a name="line.768"></a> |
| <span class="sourceLineNo">769</span> Collections.shuffle(order);<a name="line.769"></a> |
| <span class="sourceLineNo">770</span> return order;<a name="line.770"></a> |
| <span class="sourceLineNo">771</span> }<a name="line.771"></a> |
| <span class="sourceLineNo">772</span> }<a name="line.772"></a> |
| <span class="sourceLineNo">773</span><a name="line.773"></a> |
| <span class="sourceLineNo">774</span> static class RandomCandidateGenerator extends CandidateGenerator {<a name="line.774"></a> |
| <span class="sourceLineNo">775</span><a name="line.775"></a> |
| <span class="sourceLineNo">776</span> @Override<a name="line.776"></a> |
| <span class="sourceLineNo">777</span> Cluster.Action generate(Cluster cluster) {<a name="line.777"></a> |
| <span class="sourceLineNo">778</span><a name="line.778"></a> |
| <span class="sourceLineNo">779</span> int thisServer = pickRandomServer(cluster);<a name="line.779"></a> |
| <span class="sourceLineNo">780</span><a name="line.780"></a> |
| <span class="sourceLineNo">781</span> // Pick the other server<a name="line.781"></a> |
| <span class="sourceLineNo">782</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.782"></a> |
| <span class="sourceLineNo">783</span><a name="line.783"></a> |
| <span class="sourceLineNo">784</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.784"></a> |
| <span class="sourceLineNo">785</span> }<a name="line.785"></a> |
| <span class="sourceLineNo">786</span> }<a name="line.786"></a> |
| <span class="sourceLineNo">787</span><a name="line.787"></a> |
| <span class="sourceLineNo">788</span> static class LoadCandidateGenerator extends CandidateGenerator {<a name="line.788"></a> |
| <span class="sourceLineNo">789</span><a name="line.789"></a> |
| <span class="sourceLineNo">790</span> @Override<a name="line.790"></a> |
| <span class="sourceLineNo">791</span> Cluster.Action generate(Cluster cluster) {<a name="line.791"></a> |
| <span class="sourceLineNo">792</span> cluster.sortServersByRegionCount();<a name="line.792"></a> |
| <span class="sourceLineNo">793</span> int thisServer = pickMostLoadedServer(cluster, -1);<a name="line.793"></a> |
| <span class="sourceLineNo">794</span> int otherServer = pickLeastLoadedServer(cluster, thisServer);<a name="line.794"></a> |
| <span class="sourceLineNo">795</span><a name="line.795"></a> |
| <span class="sourceLineNo">796</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.796"></a> |
| <span class="sourceLineNo">797</span> }<a name="line.797"></a> |
| <span class="sourceLineNo">798</span><a name="line.798"></a> |
| <span class="sourceLineNo">799</span> private int pickLeastLoadedServer(final Cluster cluster, int thisServer) {<a name="line.799"></a> |
| <span class="sourceLineNo">800</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.800"></a> |
| <span class="sourceLineNo">801</span><a name="line.801"></a> |
| <span class="sourceLineNo">802</span> int index = 0;<a name="line.802"></a> |
| <span class="sourceLineNo">803</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.803"></a> |
| <span class="sourceLineNo">804</span> index++;<a name="line.804"></a> |
| <span class="sourceLineNo">805</span> if (index == servers.length) {<a name="line.805"></a> |
| <span class="sourceLineNo">806</span> return -1;<a name="line.806"></a> |
| <span class="sourceLineNo">807</span> }<a name="line.807"></a> |
| <span class="sourceLineNo">808</span> }<a name="line.808"></a> |
| <span class="sourceLineNo">809</span> return servers[index];<a name="line.809"></a> |
| <span class="sourceLineNo">810</span> }<a name="line.810"></a> |
| <span class="sourceLineNo">811</span><a name="line.811"></a> |
| <span class="sourceLineNo">812</span> private int pickMostLoadedServer(final Cluster cluster, int thisServer) {<a name="line.812"></a> |
| <span class="sourceLineNo">813</span> Integer[] servers = cluster.serverIndicesSortedByRegionCount;<a name="line.813"></a> |
| <span class="sourceLineNo">814</span><a name="line.814"></a> |
| <span class="sourceLineNo">815</span> int index = servers.length - 1;<a name="line.815"></a> |
| <span class="sourceLineNo">816</span> while (servers[index] == null || servers[index] == thisServer) {<a name="line.816"></a> |
| <span class="sourceLineNo">817</span> index--;<a name="line.817"></a> |
| <span class="sourceLineNo">818</span> if (index < 0) {<a name="line.818"></a> |
| <span class="sourceLineNo">819</span> return -1;<a name="line.819"></a> |
| <span class="sourceLineNo">820</span> }<a name="line.820"></a> |
| <span class="sourceLineNo">821</span> }<a name="line.821"></a> |
| <span class="sourceLineNo">822</span> return servers[index];<a name="line.822"></a> |
| <span class="sourceLineNo">823</span> }<a name="line.823"></a> |
| <span class="sourceLineNo">824</span> }<a name="line.824"></a> |
| <span class="sourceLineNo">825</span><a name="line.825"></a> |
| <span class="sourceLineNo">826</span> static class LocalityBasedCandidateGenerator extends CandidateGenerator {<a name="line.826"></a> |
| <span class="sourceLineNo">827</span><a name="line.827"></a> |
| <span class="sourceLineNo">828</span> private MasterServices masterServices;<a name="line.828"></a> |
| <span class="sourceLineNo">829</span><a name="line.829"></a> |
| <span class="sourceLineNo">830</span> LocalityBasedCandidateGenerator(MasterServices masterServices) {<a name="line.830"></a> |
| <span class="sourceLineNo">831</span> this.masterServices = masterServices;<a name="line.831"></a> |
| <span class="sourceLineNo">832</span> }<a name="line.832"></a> |
| <span class="sourceLineNo">833</span><a name="line.833"></a> |
| <span class="sourceLineNo">834</span> @Override<a name="line.834"></a> |
| <span class="sourceLineNo">835</span> Cluster.Action generate(Cluster cluster) {<a name="line.835"></a> |
| <span class="sourceLineNo">836</span> if (this.masterServices == null) {<a name="line.836"></a> |
| <span class="sourceLineNo">837</span> int thisServer = pickRandomServer(cluster);<a name="line.837"></a> |
| <span class="sourceLineNo">838</span> // Pick the other server<a name="line.838"></a> |
| <span class="sourceLineNo">839</span> int otherServer = pickOtherRandomServer(cluster, thisServer);<a name="line.839"></a> |
| <span class="sourceLineNo">840</span> return pickRandomRegions(cluster, thisServer, otherServer);<a name="line.840"></a> |
| <span class="sourceLineNo">841</span> }<a name="line.841"></a> |
| <span class="sourceLineNo">842</span><a name="line.842"></a> |
| <span class="sourceLineNo">843</span> // Randomly iterate through regions until you find one that is not on ideal host<a name="line.843"></a> |
| <span class="sourceLineNo">844</span> for (int region : getRandomIterationOrder(cluster.numRegions)) {<a name="line.844"></a> |
| <span class="sourceLineNo">845</span> int currentServer = cluster.regionIndexToServerIndex[region];<a name="line.845"></a> |
| <span class="sourceLineNo">846</span> if (currentServer != cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]) {<a name="line.846"></a> |
| <span class="sourceLineNo">847</span> Optional<Action> potential = tryMoveOrSwap(<a name="line.847"></a> |
| <span class="sourceLineNo">848</span> cluster,<a name="line.848"></a> |
| <span class="sourceLineNo">849</span> currentServer,<a name="line.849"></a> |
| <span class="sourceLineNo">850</span> region,<a name="line.850"></a> |
| <span class="sourceLineNo">851</span> cluster.getOrComputeRegionsToMostLocalEntities(LocalityType.SERVER)[region]<a name="line.851"></a> |
| <span class="sourceLineNo">852</span> );<a name="line.852"></a> |
| <span class="sourceLineNo">853</span> if (potential.isPresent()) {<a name="line.853"></a> |
| <span class="sourceLineNo">854</span> return potential.get();<a name="line.854"></a> |
| <span class="sourceLineNo">855</span> }<a name="line.855"></a> |
| <span class="sourceLineNo">856</span> }<a name="line.856"></a> |
| <span class="sourceLineNo">857</span> }<a name="line.857"></a> |
| <span class="sourceLineNo">858</span> return Cluster.NullAction;<a name="line.858"></a> |
| <span class="sourceLineNo">859</span> }<a name="line.859"></a> |
| <span class="sourceLineNo">860</span><a name="line.860"></a> |
| <span class="sourceLineNo">861</span> /**<a name="line.861"></a> |
| <span class="sourceLineNo">862</span> * Try to generate a move/swap fromRegion between fromServer and toServer such that locality is improved.<a name="line.862"></a> |
| <span class="sourceLineNo">863</span> * Returns empty optional if no move can be found<a name="line.863"></a> |
| <span class="sourceLineNo">864</span> */<a name="line.864"></a> |
| <span class="sourceLineNo">865</span> private Optional<Action> tryMoveOrSwap(Cluster cluster,<a name="line.865"></a> |
| <span class="sourceLineNo">866</span> int fromServer,<a name="line.866"></a> |
| <span class="sourceLineNo">867</span> int fromRegion,<a name="line.867"></a> |
| <span class="sourceLineNo">868</span> int toServer) {<a name="line.868"></a> |
| <span class="sourceLineNo">869</span> // Try move first. We know apriori fromRegion has the highest locality on toServer<a name="line.869"></a> |
| <span class="sourceLineNo">870</span> if (cluster.serverHasTooFewRegions(toServer)) {<a name="line.870"></a> |
| <span class="sourceLineNo">871</span> return Optional.of(getAction(fromServer, fromRegion, toServer, -1));<a name="line.871"></a> |
| <span class="sourceLineNo">872</span> }<a name="line.872"></a> |
| <span class="sourceLineNo">873</span><a name="line.873"></a> |
| <span class="sourceLineNo">874</span> // Compare locality gain/loss from swapping fromRegion with regions on toServer<a name="line.874"></a> |
| <span class="sourceLineNo">875</span> double fromRegionLocalityDelta =<a name="line.875"></a> |
| <span class="sourceLineNo">876</span> getWeightedLocality(cluster, fromRegion, toServer) - getWeightedLocality(cluster, fromRegion, fromServer);<a name="line.876"></a> |
| <span class="sourceLineNo">877</span> for (int toRegionIndex : getRandomIterationOrder(cluster.regionsPerServer[toServer].length)) {<a name="line.877"></a> |
| <span class="sourceLineNo">878</span> int toRegion = cluster.regionsPerServer[toServer][toRegionIndex];<a name="line.878"></a> |
| <span class="sourceLineNo">879</span> double toRegionLocalityDelta =<a name="line.879"></a> |
| <span class="sourceLineNo">880</span> getWeightedLocality(cluster, toRegion, fromServer) - getWeightedLocality(cluster, toRegion, toServer);<a name="line.880"></a> |
| <span class="sourceLineNo">881</span> // If locality would remain neutral or improve, attempt the swap<a name="line.881"></a> |
| <span class="sourceLineNo">882</span> if (fromRegionLocalityDelta + toRegionLocalityDelta >= 0) {<a name="line.882"></a> |
| <span class="sourceLineNo">883</span> return Optional.of(getAction(fromServer, fromRegion, toServer, toRegion));<a name="line.883"></a> |
| <span class="sourceLineNo">884</span> }<a name="line.884"></a> |
| <span class="sourceLineNo">885</span> }<a name="line.885"></a> |
| <span class="sourceLineNo">886</span><a name="line.886"></a> |
| <span class="sourceLineNo">887</span> return Optional.absent();<a name="line.887"></a> |
| <span class="sourceLineNo">888</span> }<a name="line.888"></a> |
| <span class="sourceLineNo">889</span><a name="line.889"></a> |
| <span class="sourceLineNo">890</span> private double getWeightedLocality(Cluster cluster, int region, int server) {<a name="line.890"></a> |
| <span class="sourceLineNo">891</span> return cluster.getOrComputeWeightedLocality(region, server, LocalityType.SERVER);<a name="line.891"></a> |
| <span class="sourceLineNo">892</span> }<a name="line.892"></a> |
| <span class="sourceLineNo">893</span><a name="line.893"></a> |
| <span class="sourceLineNo">894</span> void setServices(MasterServices services) {<a name="line.894"></a> |
| <span class="sourceLineNo">895</span> this.masterServices = services;<a name="line.895"></a> |
| <span class="sourceLineNo">896</span> }<a name="line.896"></a> |
| <span class="sourceLineNo">897</span> }<a name="line.897"></a> |
| <span class="sourceLineNo">898</span><a name="line.898"></a> |
| <span class="sourceLineNo">899</span> /**<a name="line.899"></a> |
| <span class="sourceLineNo">900</span> * Generates candidates which moves the replicas out of the region server for<a name="line.900"></a> |
| <span class="sourceLineNo">901</span> * co-hosted region replicas<a name="line.901"></a> |
| <span class="sourceLineNo">902</span> */<a name="line.902"></a> |
| <span class="sourceLineNo">903</span> static class RegionReplicaCandidateGenerator extends CandidateGenerator {<a name="line.903"></a> |
| <span class="sourceLineNo">904</span><a name="line.904"></a> |
| <span class="sourceLineNo">905</span> RandomCandidateGenerator randomGenerator = new RandomCandidateGenerator();<a name="line.905"></a> |
| <span class="sourceLineNo">906</span><a name="line.906"></a> |
| <span class="sourceLineNo">907</span> /**<a name="line.907"></a> |
| <span class="sourceLineNo">908</span> * Randomly select one regionIndex out of all region replicas co-hosted in the same group<a name="line.908"></a> |
| <span class="sourceLineNo">909</span> * (a group is a server, host or rack)<a name="line.909"></a> |
| <span class="sourceLineNo">910</span> * @param primariesOfRegionsPerGroup either Cluster.primariesOfRegionsPerServer,<a name="line.910"></a> |
| <span class="sourceLineNo">911</span> * primariesOfRegionsPerHost or primariesOfRegionsPerRack<a name="line.911"></a> |
| <span class="sourceLineNo">912</span> * @param regionsPerGroup either Cluster.regionsPerServer, regionsPerHost or regionsPerRack<a name="line.912"></a> |
| <span class="sourceLineNo">913</span> * @param regionIndexToPrimaryIndex Cluster.regionsIndexToPrimaryIndex<a name="line.913"></a> |
| <span class="sourceLineNo">914</span> * @return a regionIndex for the selected primary or -1 if there is no co-locating<a name="line.914"></a> |
| <span class="sourceLineNo">915</span> */<a name="line.915"></a> |
| <span class="sourceLineNo">916</span> int selectCoHostedRegionPerGroup(int[] primariesOfRegionsPerGroup, int[] regionsPerGroup<a name="line.916"></a> |
| <span class="sourceLineNo">917</span> , int[] regionIndexToPrimaryIndex) {<a name="line.917"></a> |
| <span class="sourceLineNo">918</span> int currentPrimary = -1;<a name="line.918"></a> |
| <span class="sourceLineNo">919</span> int currentPrimaryIndex = -1;<a name="line.919"></a> |
| <span class="sourceLineNo">920</span> int selectedPrimaryIndex = -1;<a name="line.920"></a> |
| <span class="sourceLineNo">921</span> double currentLargestRandom = -1;<a name="line.921"></a> |
| <span class="sourceLineNo">922</span> // primariesOfRegionsPerGroup is a sorted array. Since it contains the primary region<a name="line.922"></a> |
| <span class="sourceLineNo">923</span> // ids for the regions hosted in server, a consecutive repetition means that replicas<a name="line.923"></a> |
| <span class="sourceLineNo">924</span> // are co-hosted<a name="line.924"></a> |
| <span class="sourceLineNo">925</span> for (int j = 0; j <= primariesOfRegionsPerGroup.length; j++) {<a name="line.925"></a> |
| <span class="sourceLineNo">926</span> int primary = j < primariesOfRegionsPerGroup.length<a name="line.926"></a> |
| <span class="sourceLineNo">927</span> ? primariesOfRegionsPerGroup[j] : -1;<a name="line.927"></a> |
| <span class="sourceLineNo">928</span> if (primary != currentPrimary) { // check for whether we see a new primary<a name="line.928"></a> |
| <span class="sourceLineNo">929</span> int numReplicas = j - currentPrimaryIndex;<a name="line.929"></a> |
| <span class="sourceLineNo">930</span> if (numReplicas > 1) { // means consecutive primaries, indicating co-location<a name="line.930"></a> |
| <span class="sourceLineNo">931</span> // decide to select this primary region id or not<a name="line.931"></a> |
| <span class="sourceLineNo">932</span> double currentRandom = RANDOM.nextDouble();<a name="line.932"></a> |
| <span class="sourceLineNo">933</span> // we don't know how many region replicas are co-hosted, we will randomly select one<a name="line.933"></a> |
| <span class="sourceLineNo">934</span> // using reservoir sampling (http://gregable.com/2007/10/reservoir-sampling.html)<a name="line.934"></a> |
| <span class="sourceLineNo">935</span> if (currentRandom > currentLargestRandom) {<a name="line.935"></a> |
| <span class="sourceLineNo">936</span> selectedPrimaryIndex = currentPrimary;<a name="line.936"></a> |
| <span class="sourceLineNo">937</span> currentLargestRandom = currentRandom;<a name="line.937"></a> |
| <span class="sourceLineNo">938</span> }<a name="line.938"></a> |
| <span class="sourceLineNo">939</span> }<a name="line.939"></a> |
| <span class="sourceLineNo">940</span> currentPrimary = primary;<a name="line.940"></a> |
| <span class="sourceLineNo">941</span> currentPrimaryIndex = j;<a name="line.941"></a> |
| <span class="sourceLineNo">942</span> }<a name="line.942"></a> |
| <span class="sourceLineNo">943</span> }<a name="line.943"></a> |
| <span class="sourceLineNo">944</span><a name="line.944"></a> |
| <span class="sourceLineNo">945</span> // we have found the primary id for the region to move. Now find the actual regionIndex<a name="line.945"></a> |
| <span class="sourceLineNo">946</span> // with the given primary, prefer to move the secondary region.<a name="line.946"></a> |
| <span class="sourceLineNo">947</span> for (int j = 0; j < regionsPerGroup.length; j++) {<a name="line.947"></a> |
| <span class="sourceLineNo">948</span> int regionIndex = regionsPerGroup[j];<a name="line.948"></a> |
| <span class="sourceLineNo">949</span> if (selectedPrimaryIndex == regionIndexToPrimaryIndex[regionIndex]) {<a name="line.949"></a> |
| <span class="sourceLineNo">950</span> // always move the secondary, not the primary<a name="line.950"></a> |
| <span class="sourceLineNo">951</span> if (selectedPrimaryIndex != regionIndex) {<a name="line.951"></a> |
| <span class="sourceLineNo">952</span> return regionIndex;<a name="line.952"></a> |
| <span class="sourceLineNo">953</span> }<a name="line.953"></a> |
| <span class="sourceLineNo">954</span> }<a name="line.954"></a> |
| <span class="sourceLineNo">955</span> }<a name="line.955"></a> |
| <span class="sourceLineNo">956</span> return -1;<a name="line.956"></a> |
| <span class="sourceLineNo">957</span> }<a name="line.957"></a> |
| <span class="sourceLineNo">958</span><a name="line.958"></a> |
| <span class="sourceLineNo">959</span> @Override<a name="line.959"></a> |
| <span class="sourceLineNo">960</span> Cluster.Action generate(Cluster cluster) {<a name="line.960"></a> |
| <span class="sourceLineNo">961</span> int serverIndex = pickRandomServer(cluster);<a name="line.961"></a> |
| <span class="sourceLineNo">962</span> if (cluster.numServers <= 1 || serverIndex == -1) {<a name="line.962"></a> |
| <span class="sourceLineNo">963</span> return Cluster.NullAction;<a name="line.963"></a> |
| <span class="sourceLineNo">964</span> }<a name="line.964"></a> |
| <span class="sourceLineNo">965</span><a name="line.965"></a> |
| <span class="sourceLineNo">966</span> int regionIndex = selectCoHostedRegionPerGroup(<a name="line.966"></a> |
| <span class="sourceLineNo">967</span> cluster.primariesOfRegionsPerServer[serverIndex],<a name="line.967"></a> |
| <span class="sourceLineNo">968</span> cluster.regionsPerServer[serverIndex],<a name="line.968"></a> |
| <span class="sourceLineNo">969</span> cluster.regionIndexToPrimaryIndex);<a name="line.969"></a> |
| <span class="sourceLineNo">970</span><a name="line.970"></a> |
| <span class="sourceLineNo">971</span> // if there are no pairs of region replicas co-hosted, default to random generator<a name="line.971"></a> |
| <span class="sourceLineNo">972</span> if (regionIndex == -1) {<a name="line.972"></a> |
| <span class="sourceLineNo">973</span> // default to randompicker<a name="line.973"></a> |
| <span class="sourceLineNo">974</span> return randomGenerator.generate(cluster);<a name="line.974"></a> |
| <span class="sourceLineNo">975</span> }<a name="line.975"></a> |
| <span class="sourceLineNo">976</span><a name="line.976"></a> |
| <span class="sourceLineNo">977</span> int toServerIndex = pickOtherRandomServer(cluster, serverIndex);<a name="line.977"></a> |
| <span class="sourceLineNo">978</span> int toRegionIndex = pickRandomRegion(cluster, toServerIndex, 0.9f);<a name="line.978"></a> |
| <span class="sourceLineNo">979</span> return getAction(serverIndex, regionIndex, toServerIndex, toRegionIndex);<a name="line.979"></a> |
| <span class="sourceLineNo">980</span> }<a name="line.980"></a> |
| <span class="sourceLineNo">981</span> }<a name="line.981"></a> |
| <span class="sourceLineNo">982</span><a name="line.982"></a> |
| <span class="sourceLineNo">983</span> /**<a name="line.983"></a> |
| <span class="sourceLineNo">984</span> * Generates candidates which moves the replicas out of the rack for<a name="line.984"></a> |
| <span class="sourceLineNo">985</span> * co-hosted region replicas in the same rack<a name="line.985"></a> |
| <span class="sourceLineNo">986</span> */<a name="line.986"></a> |
| <span class="sourceLineNo">987</span> static class RegionReplicaRackCandidateGenerator extends RegionReplicaCandidateGenerator {<a name="line.987"></a> |
| <span class="sourceLineNo">988</span> @Override<a name="line.988"></a> |
| <span class="sourceLineNo">989</span> Cluster.Action generate(Cluster cluster) {<a name="line.989"></a> |
| <span class="sourceLineNo">990</span> int rackIndex = pickRandomRack(cluster);<a name="line.990"></a> |
| <span class="sourceLineNo">991</span> if (cluster.numRacks <= 1 || rackIndex == -1) {<a name="line.991"></a> |
| <span class="sourceLineNo">992</span> return super.generate(cluster);<a name="line.992"></a> |
| <span class="sourceLineNo">993</span> }<a name="line.993"></a> |
| <span class="sourceLineNo">994</span><a name="line.994"></a> |
| <span class="sourceLineNo">995</span> int regionIndex = selectCoHostedRegionPerGroup(<a name="line.995"></a> |
| <span class="sourceLineNo">996</span> cluster.primariesOfRegionsPerRack[rackIndex],<a name="line.996"></a> |
| <span class="sourceLineNo">997</span> cluster.regionsPerRack[rackIndex],<a name="line.997"></a> |
| <span class="sourceLineNo">998</span> cluster.regionIndexToPrimaryIndex);<a name="line.998"></a> |
| <span class="sourceLineNo">999</span><a name="line.999"></a> |
| <span class="sourceLineNo">1000</span> // if there are no pairs of region replicas co-hosted, default to random generator<a name="line.1000"></a> |
| <span class="sourceLineNo">1001</span> if (regionIndex == -1) {<a name="line.1001"></a> |
| <span class="sourceLineNo">1002</span> // default to randompicker<a name="line.1002"></a> |
| <span class="sourceLineNo">1003</span> return randomGenerator.generate(cluster);<a name="line.1003"></a> |
| <span class="sourceLineNo">1004</span> }<a name="line.1004"></a> |
| <span class="sourceLineNo">1005</span><a name="line.1005"></a> |
| <span class="sourceLineNo">1006</span> int serverIndex = cluster.regionIndexToServerIndex[regionIndex];<a name="line.1006"></a> |
| <span class="sourceLineNo">1007</span> int toRackIndex = pickOtherRandomRack(cluster, rackIndex);<a name="line.1007"></a> |
| <span class="sourceLineNo">1008</span><a name="line.1008"></a> |
| <span class="sourceLineNo">1009</span> int rand = RANDOM.nextInt(cluster.serversPerRack[toRackIndex].length);<a name="line.1009"></a> |
| <span class="sourceLineNo">1010</span> int toServerIndex = cluster.serversPerRack[toRackIndex][rand];<a name="line.1010"></a> |
| <span class="sourceLineNo">1011</span> int toRegionIndex = pickRandomRegion(cluster, toServerIndex, 0.9f);<a name="line.1011"></a> |
| <span class="sourceLineNo">1012</span> return getAction(serverIndex, regionIndex, toServerIndex, toRegionIndex);<a name="line.1012"></a> |
| <span class="sourceLineNo">1013</span> }<a name="line.1013"></a> |
| <span class="sourceLineNo">1014</span> }<a name="line.1014"></a> |
| <span class="sourceLineNo">1015</span><a name="line.1015"></a> |
| <span class="sourceLineNo">1016</span> /**<a name="line.1016"></a> |
| <span class="sourceLineNo">1017</span> * Base class of StochasticLoadBalancer's Cost Functions.<a name="line.1017"></a> |
| <span class="sourceLineNo">1018</span> */<a name="line.1018"></a> |
| <span class="sourceLineNo">1019</span> public abstract static class CostFunction {<a name="line.1019"></a> |
| <span class="sourceLineNo">1020</span><a name="line.1020"></a> |
| <span class="sourceLineNo">1021</span> private float multiplier = 0;<a name="line.1021"></a> |
| <span class="sourceLineNo">1022</span><a name="line.1022"></a> |
| <span class="sourceLineNo">1023</span> protected Cluster cluster;<a name="line.1023"></a> |
| <span class="sourceLineNo">1024</span><a name="line.1024"></a> |
| <span class="sourceLineNo">1025</span> public CostFunction(Configuration c) {<a name="line.1025"></a> |
| <span class="sourceLineNo">1026</span> }<a name="line.1026"></a> |
| <span class="sourceLineNo">1027</span><a name="line.1027"></a> |
| <span class="sourceLineNo">1028</span> boolean isNeeded() {<a name="line.1028"></a> |
| <span class="sourceLineNo">1029</span> return true;<a name="line.1029"></a> |
| <span class="sourceLineNo">1030</span> }<a name="line.1030"></a> |
| <span class="sourceLineNo">1031</span> float getMultiplier() {<a name="line.1031"></a> |
| <span class="sourceLineNo">1032</span> return multiplier;<a name="line.1032"></a> |
| <span class="sourceLineNo">1033</span> }<a name="line.1033"></a> |
| <span class="sourceLineNo">1034</span><a name="line.1034"></a> |
| <span class="sourceLineNo">1035</span> void setMultiplier(float m) {<a name="line.1035"></a> |
| <span class="sourceLineNo">1036</span> this.multiplier = m;<a name="line.1036"></a> |
| <span class="sourceLineNo">1037</span> }<a name="line.1037"></a> |
| <span class="sourceLineNo">1038</span><a name="line.1038"></a> |
| <span class="sourceLineNo">1039</span> /** Called once per LB invocation to give the cost function<a name="line.1039"></a> |
| <span class="sourceLineNo">1040</span> * to initialize it's state, and perform any costly calculation.<a name="line.1040"></a> |
| <span class="sourceLineNo">1041</span> */<a name="line.1041"></a> |
| <span class="sourceLineNo">1042</span> void init(Cluster cluster) {<a name="line.1042"></a> |
| <span class="sourceLineNo">1043</span> this.cluster = cluster;<a name="line.1043"></a> |
| <span class="sourceLineNo">1044</span> }<a name="line.1044"></a> |
| <span class="sourceLineNo">1045</span><a name="line.1045"></a> |
| <span class="sourceLineNo">1046</span> /** Called once per cluster Action to give the cost function<a name="line.1046"></a> |
| <span class="sourceLineNo">1047</span> * an opportunity to update it's state. postAction() is always<a name="line.1047"></a> |
| <span class="sourceLineNo">1048</span> * called at least once before cost() is called with the cluster<a name="line.1048"></a> |
| <span class="sourceLineNo">1049</span> * that this action is performed on. */<a name="line.1049"></a> |
| <span class="sourceLineNo">1050</span> void postAction(Action action) {<a name="line.1050"></a> |
| <span class="sourceLineNo">1051</span> switch (action.type) {<a name="line.1051"></a> |
| <span class="sourceLineNo">1052</span> case NULL: break;<a name="line.1052"></a> |
| <span class="sourceLineNo">1053</span> case ASSIGN_REGION:<a name="line.1053"></a> |
| <span class="sourceLineNo">1054</span> AssignRegionAction ar = (AssignRegionAction) action;<a name="line.1054"></a> |
| <span class="sourceLineNo">1055</span> regionMoved(ar.region, -1, ar.server);<a name="line.1055"></a> |
| <span class="sourceLineNo">1056</span> break;<a name="line.1056"></a> |
| <span class="sourceLineNo">1057</span> case MOVE_REGION:<a name="line.1057"></a> |
| <span class="sourceLineNo">1058</span> MoveRegionAction mra = (MoveRegionAction) action;<a name="line.1058"></a> |
| <span class="sourceLineNo">1059</span> regionMoved(mra.region, mra.fromServer, mra.toServer);<a name="line.1059"></a> |
| <span class="sourceLineNo">1060</span> break;<a name="line.1060"></a> |
| <span class="sourceLineNo">1061</span> case SWAP_REGIONS:<a name="line.1061"></a> |
| <span class="sourceLineNo">1062</span> SwapRegionsAction a = (SwapRegionsAction) action;<a name="line.1062"></a> |
| <span class="sourceLineNo">1063</span> regionMoved(a.fromRegion, a.fromServer, a.toServer);<a name="line.1063"></a> |
| <span class="sourceLineNo">1064</span> regionMoved(a.toRegion, a.toServer, a.fromServer);<a name="line.1064"></a> |
| <span class="sourceLineNo">1065</span> break;<a name="line.1065"></a> |
| <span class="sourceLineNo">1066</span> default:<a name="line.1066"></a> |
| <span class="sourceLineNo">1067</span> throw new RuntimeException("Uknown action:" + action.type);<a name="line.1067"></a> |
| <span class="sourceLineNo">1068</span> }<a name="line.1068"></a> |
| <span class="sourceLineNo">1069</span> }<a name="line.1069"></a> |
| <span class="sourceLineNo">1070</span><a name="line.1070"></a> |
| <span class="sourceLineNo">1071</span> protected void regionMoved(int region, int oldServer, int newServer) {<a name="line.1071"></a> |
| <span class="sourceLineNo">1072</span> }<a name="line.1072"></a> |
| <span class="sourceLineNo">1073</span><a name="line.1073"></a> |
| <span class="sourceLineNo">1074</span> protected abstract double cost();<a name="line.1074"></a> |
| <span class="sourceLineNo">1075</span><a name="line.1075"></a> |
| <span class="sourceLineNo">1076</span> @SuppressWarnings("checkstyle:linelength")<a name="line.1076"></a> |
| <span class="sourceLineNo">1077</span> /**<a name="line.1077"></a> |
| <span class="sourceLineNo">1078</span> * Function to compute a scaled cost using<a name="line.1078"></a> |
| <span class="sourceLineNo">1079</span> * {@link org.apache.commons.math3.stat.descriptive.DescriptiveStatistics#DescriptiveStatistics()}.<a name="line.1079"></a> |
| <span class="sourceLineNo">1080</span> * It assumes that this is a zero sum set of costs. It assumes that the worst case<a name="line.1080"></a> |
| <span class="sourceLineNo">1081</span> * possible is all of the elements in one region server and the rest having 0.<a name="line.1081"></a> |
| <span class="sourceLineNo">1082</span> *<a name="line.1082"></a> |
| <span class="sourceLineNo">1083</span> * @param stats the costs<a name="line.1083"></a> |
| <span class="sourceLineNo">1084</span> * @return a scaled set of costs.<a name="line.1084"></a> |
| <span class="sourceLineNo">1085</span> */<a name="line.1085"></a> |
| <span class="sourceLineNo">1086</span> protected double costFromArray(double[] stats) {<a name="line.1086"></a> |
| <span class="sourceLineNo">1087</span> double totalCost = 0;<a name="line.1087"></a> |
| <span class="sourceLineNo">1088</span> double total = getSum(stats);<a name="line.1088"></a> |
| <span class="sourceLineNo">1089</span><a name="line.1089"></a> |
| <span class="sourceLineNo">1090</span> double count = stats.length;<a name="line.1090"></a> |
| <span class="sourceLineNo">1091</span> double mean = total/count;<a name="line.1091"></a> |
| <span class="sourceLineNo">1092</span><a name="line.1092"></a> |
| <span class="sourceLineNo">1093</span> // Compute max as if all region servers had 0 and one had the sum of all costs. This must be<a name="line.1093"></a> |
| <span class="sourceLineNo">1094</span> // a zero sum cost for this to make sense.<a name="line.1094"></a> |
| <span class="sourceLineNo">1095</span> double max = ((count - 1) * mean) + (total - mean);<a name="line.1095"></a> |
| <span class="sourceLineNo">1096</span><a name="line.1096"></a> |
| <span class="sourceLineNo">1097</span> // It's possible that there aren't enough regions to go around<a name="line.1097"></a> |
| <span class="sourceLineNo">1098</span> double min;<a name="line.1098"></a> |
| <span class="sourceLineNo">1099</span> if (count > total) {<a name="line.1099"></a> |
| <span class="sourceLineNo">1100</span> min = ((count - total) * mean) + ((1 - mean) * total);<a name="line.1100"></a> |
| <span class="sourceLineNo">1101</span> } else {<a name="line.1101"></a> |
| <span class="sourceLineNo">1102</span> // Some will have 1 more than everything else.<a name="line.1102"></a> |
| <span class="sourceLineNo">1103</span> int numHigh = (int) (total - (Math.floor(mean) * count));<a name="line.1103"></a> |
| <span class="sourceLineNo">1104</span> int numLow = (int) (count - numHigh);<a name="line.1104"></a> |
| <span class="sourceLineNo">1105</span><a name="line.1105"></a> |
| <span class="sourceLineNo">1106</span> min = (numHigh * (Math.ceil(mean) - mean)) + (numLow * (mean - Math.floor(mean)));<a name="line.1106"></a> |
| <span class="sourceLineNo">1107</span><a name="line.1107"></a> |
| <span class="sourceLineNo">1108</span> }<a name="line.1108"></a> |
| <span class="sourceLineNo">1109</span> min = Math.max(0, min);<a name="line.1109"></a> |
| <span class="sourceLineNo">1110</span> for (int i=0; i<stats.length; i++) {<a name="line.1110"></a> |
| <span class="sourceLineNo">1111</span> double n = stats[i];<a name="line.1111"></a> |
| <span class="sourceLineNo">1112</span> double diff = Math.abs(mean - n);<a name="line.1112"></a> |
| <span class="sourceLineNo">1113</span> totalCost += diff;<a name="line.1113"></a> |
| <span class="sourceLineNo">1114</span> }<a name="line.1114"></a> |
| <span class="sourceLineNo">1115</span><a name="line.1115"></a> |
| <span class="sourceLineNo">1116</span> double scaled = scale(min, max, totalCost);<a name="line.1116"></a> |
| <span class="sourceLineNo">1117</span> return scaled;<a name="line.1117"></a> |
| <span class="sourceLineNo">1118</span> }<a name="line.1118"></a> |
| <span class="sourceLineNo">1119</span><a name="line.1119"></a> |
| <span class="sourceLineNo">1120</span> private double getSum(double[] stats) {<a name="line.1120"></a> |
| <span class="sourceLineNo">1121</span> double total = 0;<a name="line.1121"></a> |
| <span class="sourceLineNo">1122</span> for(double s:stats) {<a name="line.1122"></a> |
| <span class="sourceLineNo">1123</span> total += s;<a name="line.1123"></a> |
| <span class="sourceLineNo">1124</span> }<a name="line.1124"></a> |
| <span class="sourceLineNo">1125</span> return total;<a name="line.1125"></a> |
| <span class="sourceLineNo">1126</span> }<a name="line.1126"></a> |
| <span class="sourceLineNo">1127</span><a name="line.1127"></a> |
| <span class="sourceLineNo">1128</span> /**<a name="line.1128"></a> |
| <span class="sourceLineNo">1129</span> * Scale the value between 0 and 1.<a name="line.1129"></a> |
| <span class="sourceLineNo">1130</span> *<a name="line.1130"></a> |
| <span class="sourceLineNo">1131</span> * @param min Min value<a name="line.1131"></a> |
| <span class="sourceLineNo">1132</span> * @param max The Max value<a name="line.1132"></a> |
| <span class="sourceLineNo">1133</span> * @param value The value to be scaled.<a name="line.1133"></a> |
| <span class="sourceLineNo">1134</span> * @return The scaled value.<a name="line.1134"></a> |
| <span class="sourceLineNo">1135</span> */<a name="line.1135"></a> |
| <span class="sourceLineNo">1136</span> protected double scale(double min, double max, double value) {<a name="line.1136"></a> |
| <span class="sourceLineNo">1137</span> if (max <= min || value <= min) {<a name="line.1137"></a> |
| <span class="sourceLineNo">1138</span> return 0;<a name="line.1138"></a> |
| <span class="sourceLineNo">1139</span> }<a name="line.1139"></a> |
| <span class="sourceLineNo">1140</span> if ((max - min) == 0) return 0;<a name="line.1140"></a> |
| <span class="sourceLineNo">1141</span><a name="line.1141"></a> |
| <span class="sourceLineNo">1142</span> return Math.max(0d, Math.min(1d, (value - min) / (max - min)));<a name="line.1142"></a> |
| <span class="sourceLineNo">1143</span> }<a name="line.1143"></a> |
| <span class="sourceLineNo">1144</span> }<a name="line.1144"></a> |
| <span class="sourceLineNo">1145</span><a name="line.1145"></a> |
| <span class="sourceLineNo">1146</span> /**<a name="line.1146"></a> |
| <span class="sourceLineNo">1147</span> * Given the starting state of the regions and a potential ending state<a name="line.1147"></a> |
| <span class="sourceLineNo">1148</span> * compute cost based upon the number of regions that have moved.<a name="line.1148"></a> |
| <span class="sourceLineNo">1149</span> */<a name="line.1149"></a> |
| <span class="sourceLineNo">1150</span> static class MoveCostFunction extends CostFunction {<a name="line.1150"></a> |
| <span class="sourceLineNo">1151</span> private static final String MOVE_COST_KEY = "hbase.master.balancer.stochastic.moveCost";<a name="line.1151"></a> |
| <span class="sourceLineNo">1152</span> private static final String MAX_MOVES_PERCENT_KEY =<a name="line.1152"></a> |
| <span class="sourceLineNo">1153</span> "hbase.master.balancer.stochastic.maxMovePercent";<a name="line.1153"></a> |
| <span class="sourceLineNo">1154</span> private static final float DEFAULT_MOVE_COST = 7;<a name="line.1154"></a> |
| <span class="sourceLineNo">1155</span> private static final int DEFAULT_MAX_MOVES = 600;<a name="line.1155"></a> |
| <span class="sourceLineNo">1156</span> private static final float DEFAULT_MAX_MOVE_PERCENT = 0.25f;<a name="line.1156"></a> |
| <span class="sourceLineNo">1157</span><a name="line.1157"></a> |
| <span class="sourceLineNo">1158</span> private final float maxMovesPercent;<a name="line.1158"></a> |
| <span class="sourceLineNo">1159</span><a name="line.1159"></a> |
| <span class="sourceLineNo">1160</span> MoveCostFunction(Configuration conf) {<a name="line.1160"></a> |
| <span class="sourceLineNo">1161</span> super(conf);<a name="line.1161"></a> |
| <span class="sourceLineNo">1162</span><a name="line.1162"></a> |
| <span class="sourceLineNo">1163</span> // Move cost multiplier should be the same cost or higher than the rest of the costs to ensure<a name="line.1163"></a> |
| <span class="sourceLineNo">1164</span> // that large benefits are need to overcome the cost of a move.<a name="line.1164"></a> |
| <span class="sourceLineNo">1165</span> this.setMultiplier(conf.getFloat(MOVE_COST_KEY, DEFAULT_MOVE_COST));<a name="line.1165"></a> |
| <span class="sourceLineNo">1166</span> // What percent of the number of regions a single run of the balancer can move.<a name="line.1166"></a> |
| <span class="sourceLineNo">1167</span> maxMovesPercent = conf.getFloat(MAX_MOVES_PERCENT_KEY, DEFAULT_MAX_MOVE_PERCENT);<a name="line.1167"></a> |
| <span class="sourceLineNo">1168</span> }<a name="line.1168"></a> |
| <span class="sourceLineNo">1169</span><a name="line.1169"></a> |
| <span class="sourceLineNo">1170</span> @Override<a name="line.1170"></a> |
| <span class="sourceLineNo">1171</span> protected double cost() {<a name="line.1171"></a> |
| <span class="sourceLineNo">1172</span> // Try and size the max number of Moves, but always be prepared to move some.<a name="line.1172"></a> |
| <span class="sourceLineNo">1173</span> int maxMoves = Math.max((int) (cluster.numRegions * maxMovesPercent),<a name="line.1173"></a> |
| <span class="sourceLineNo">1174</span> DEFAULT_MAX_MOVES);<a name="line.1174"></a> |
| <span class="sourceLineNo">1175</span><a name="line.1175"></a> |
| <span class="sourceLineNo">1176</span> double moveCost = cluster.numMovedRegions;<a name="line.1176"></a> |
| <span class="sourceLineNo">1177</span><a name="line.1177"></a> |
| <span class="sourceLineNo">1178</span> // Don't let this single balance move more than the max moves.<a name="line.1178"></a> |
| <span class="sourceLineNo">1179</span> // This allows better scaling to accurately represent the actual cost of a move.<a name="line.1179"></a> |
| <span class="sourceLineNo">1180</span> if (moveCost > maxMoves) {<a name="line.1180"></a> |
| <span class="sourceLineNo">1181</span> return 1000000; // return a number much greater than any of the other cost<a name="line.1181"></a> |
| <span class="sourceLineNo">1182</span> }<a name="line.1182"></a> |
| <span class="sourceLineNo">1183</span><a name="line.1183"></a> |
| <span class="sourceLineNo">1184</span> return scale(0, Math.min(cluster.numRegions, maxMoves), moveCost);<a name="line.1184"></a> |
| <span class="sourceLineNo">1185</span> }<a name="line.1185"></a> |
| <span class="sourceLineNo">1186</span> }<a name="line.1186"></a> |
| <span class="sourceLineNo">1187</span><a name="line.1187"></a> |
| <span class="sourceLineNo">1188</span> /**<a name="line.1188"></a> |
| <span class="sourceLineNo">1189</span> * Compute the cost of a potential cluster state from skew in number of<a name="line.1189"></a> |
| <span class="sourceLineNo">1190</span> * regions on a cluster.<a name="line.1190"></a> |
| <span class="sourceLineNo">1191</span> */<a name="line.1191"></a> |
| <span class="sourceLineNo">1192</span> static class RegionCountSkewCostFunction extends CostFunction {<a name="line.1192"></a> |
| <span class="sourceLineNo">1193</span> private static final String REGION_COUNT_SKEW_COST_KEY =<a name="line.1193"></a> |
| <span class="sourceLineNo">1194</span> "hbase.master.balancer.stochastic.regionCountCost";<a name="line.1194"></a> |
| <span class="sourceLineNo">1195</span> private static final float DEFAULT_REGION_COUNT_SKEW_COST = 500;<a name="line.1195"></a> |
| <span class="sourceLineNo">1196</span><a name="line.1196"></a> |
| <span class="sourceLineNo">1197</span> private double[] stats = null;<a name="line.1197"></a> |
| <span class="sourceLineNo">1198</span><a name="line.1198"></a> |
| <span class="sourceLineNo">1199</span> RegionCountSkewCostFunction(Configuration conf) {<a name="line.1199"></a> |
| <span class="sourceLineNo">1200</span> super(conf);<a name="line.1200"></a> |
| <span class="sourceLineNo">1201</span> // Load multiplier should be the greatest as it is the most general way to balance data.<a name="line.1201"></a> |
| <span class="sourceLineNo">1202</span> this.setMultiplier(conf.getFloat(REGION_COUNT_SKEW_COST_KEY, DEFAULT_REGION_COUNT_SKEW_COST));<a name="line.1202"></a> |
| <span class="sourceLineNo">1203</span> }<a name="line.1203"></a> |
| <span class="sourceLineNo">1204</span><a name="line.1204"></a> |
| <span class="sourceLineNo">1205</span> @Override<a name="line.1205"></a> |
| <span class="sourceLineNo">1206</span> protected double cost() {<a name="line.1206"></a> |
| <span class="sourceLineNo">1207</span> if (stats == null || stats.length != cluster.numServers) {<a name="line.1207"></a> |
| <span class="sourceLineNo">1208</span> stats = new double[cluster.numServers];<a name="line.1208"></a> |
| <span class="sourceLineNo">1209</span> }<a name="line.1209"></a> |
| <span class="sourceLineNo">1210</span><a name="line.1210"></a> |
| <span class="sourceLineNo">1211</span> for (int i =0; i < cluster.numServers; i++) {<a name="line.1211"></a> |
| <span class="sourceLineNo">1212</span> stats[i] = cluster.regionsPerServer[i].length;<a name="line.1212"></a> |
| <span class="sourceLineNo">1213</span> }<a name="line.1213"></a> |
| <span class="sourceLineNo">1214</span><a name="line.1214"></a> |
| <span class="sourceLineNo">1215</span> return costFromArray(stats);<a name="line.1215"></a> |
| <span class="sourceLineNo">1216</span> }<a name="line.1216"></a> |
| <span class="sourceLineNo">1217</span> }<a name="line.1217"></a> |
| <span class="sourceLineNo">1218</span><a name="line.1218"></a> |
| <span class="sourceLineNo">1219</span> /**<a name="line.1219"></a> |
| <span class="sourceLineNo">1220</span> * Compute the cost of a potential cluster state from skew in number of<a name="line.1220"></a> |
| <span class="sourceLineNo">1221</span> * primary regions on a cluster.<a name="line.1221"></a> |
| <span class="sourceLineNo">1222</span> */<a name="line.1222"></a> |
| <span class="sourceLineNo">1223</span> static class PrimaryRegionCountSkewCostFunction extends CostFunction {<a name="line.1223"></a> |
| <span class="sourceLineNo">1224</span> private static final String PRIMARY_REGION_COUNT_SKEW_COST_KEY =<a name="line.1224"></a> |
| <span class="sourceLineNo">1225</span> "hbase.master.balancer.stochastic.primaryRegionCountCost";<a name="line.1225"></a> |
| <span class="sourceLineNo">1226</span> private static final float DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST = 500;<a name="line.1226"></a> |
| <span class="sourceLineNo">1227</span><a name="line.1227"></a> |
| <span class="sourceLineNo">1228</span> private double[] stats = null;<a name="line.1228"></a> |
| <span class="sourceLineNo">1229</span><a name="line.1229"></a> |
| <span class="sourceLineNo">1230</span> PrimaryRegionCountSkewCostFunction(Configuration conf) {<a name="line.1230"></a> |
| <span class="sourceLineNo">1231</span> super(conf);<a name="line.1231"></a> |
| <span class="sourceLineNo">1232</span> // Load multiplier should be the greatest as primary regions serve majority of reads/writes.<a name="line.1232"></a> |
| <span class="sourceLineNo">1233</span> this.setMultiplier(conf.getFloat(PRIMARY_REGION_COUNT_SKEW_COST_KEY,<a name="line.1233"></a> |
| <span class="sourceLineNo">1234</span> DEFAULT_PRIMARY_REGION_COUNT_SKEW_COST));<a name="line.1234"></a> |
| <span class="sourceLineNo">1235</span> }<a name="line.1235"></a> |
| <span class="sourceLineNo">1236</span><a name="line.1236"></a> |
| <span class="sourceLineNo">1237</span> @Override<a name="line.1237"></a> |
| <span class="sourceLineNo">1238</span> protected double cost() {<a name="line.1238"></a> |
| <span class="sourceLineNo">1239</span> if (!cluster.hasRegionReplicas) {<a name="line.1239"></a> |
| <span class="sourceLineNo">1240</span> return 0;<a name="line.1240"></a> |
| <span class="sourceLineNo">1241</span> }<a name="line.1241"></a> |
| <span class="sourceLineNo">1242</span> if (stats == null || stats.length != cluster.numServers) {<a name="line.1242"></a> |
| <span class="sourceLineNo">1243</span> stats = new double[cluster.numServers];<a name="line.1243"></a> |
| <span class="sourceLineNo">1244</span> }<a name="line.1244"></a> |
| <span class="sourceLineNo">1245</span><a name="line.1245"></a> |
| <span class="sourceLineNo">1246</span> for (int i = 0; i < cluster.numServers; i++) {<a name="line.1246"></a> |
| <span class="sourceLineNo">1247</span> stats[i] = 0;<a name="line.1247"></a> |
| <span class="sourceLineNo">1248</span> for (int regionIdx : cluster.regionsPerServer[i]) {<a name="line.1248"></a> |
| <span class="sourceLineNo">1249</span> if (regionIdx == cluster.regionIndexToPrimaryIndex[regionIdx]) {<a name="line.1249"></a> |
| <span class="sourceLineNo">1250</span> stats[i]++;<a name="line.1250"></a> |
| <span class="sourceLineNo">1251</span> }<a name="line.1251"></a> |
| <span class="sourceLineNo">1252</span> }<a name="line.1252"></a> |
| <span class="sourceLineNo">1253</span> }<a name="line.1253"></a> |
| <span class="sourceLineNo">1254</span><a name="line.1254"></a> |
| <span class="sourceLineNo">1255</span> return costFromArray(stats);<a name="line.1255"></a> |
| <span class="sourceLineNo">1256</span> }<a name="line.1256"></a> |
| <span class="sourceLineNo">1257</span> }<a name="line.1257"></a> |
| <span class="sourceLineNo">1258</span><a name="line.1258"></a> |
| <span class="sourceLineNo">1259</span> /**<a name="line.1259"></a> |
| <span class="sourceLineNo">1260</span> * Compute the cost of a potential cluster configuration based upon how evenly<a name="line.1260"></a> |
| <span class="sourceLineNo">1261</span> * distributed tables are.<a name="line.1261"></a> |
| <span class="sourceLineNo">1262</span> */<a name="line.1262"></a> |
| <span class="sourceLineNo">1263</span> static class TableSkewCostFunction extends CostFunction {<a name="line.1263"></a> |
| <span class="sourceLineNo">1264</span><a name="line.1264"></a> |
| <span class="sourceLineNo">1265</span> private static final String TABLE_SKEW_COST_KEY =<a name="line.1265"></a> |
| <span class="sourceLineNo">1266</span> "hbase.master.balancer.stochastic.tableSkewCost";<a name="line.1266"></a> |
| <span class="sourceLineNo">1267</span> private static final float DEFAULT_TABLE_SKEW_COST = 35;<a name="line.1267"></a> |
| <span class="sourceLineNo">1268</span><a name="line.1268"></a> |
| <span class="sourceLineNo">1269</span> TableSkewCostFunction(Configuration conf) {<a name="line.1269"></a> |
| <span class="sourceLineNo">1270</span> super(conf);<a name="line.1270"></a> |
| <span class="sourceLineNo">1271</span> this.setMultiplier(conf.getFloat(TABLE_SKEW_COST_KEY, DEFAULT_TABLE_SKEW_COST));<a name="line.1271"></a> |
| <span class="sourceLineNo">1272</span> }<a name="line.1272"></a> |
| <span class="sourceLineNo">1273</span><a name="line.1273"></a> |
| <span class="sourceLineNo">1274</span> @Override<a name="line.1274"></a> |
| <span class="sourceLineNo">1275</span> protected double cost() {<a name="line.1275"></a> |
| <span class="sourceLineNo">1276</span> double max = cluster.numRegions;<a name="line.1276"></a> |
| <span class="sourceLineNo">1277</span> double min = ((double) cluster.numRegions) / cluster.numServers;<a name="line.1277"></a> |
| <span class="sourceLineNo">1278</span> double value = 0;<a name="line.1278"></a> |
| <span class="sourceLineNo">1279</span><a name="line.1279"></a> |
| <span class="sourceLineNo">1280</span> for (int i = 0; i < cluster.numMaxRegionsPerTable.length; i++) {<a name="line.1280"></a> |
| <span class="sourceLineNo">1281</span> value += cluster.numMaxRegionsPerTable[i];<a name="line.1281"></a> |
| <span class="sourceLineNo">1282</span> }<a name="line.1282"></a> |
| <span class="sourceLineNo">1283</span><a name="line.1283"></a> |
| <span class="sourceLineNo">1284</span> return scale(min, max, value);<a name="line.1284"></a> |
| <span class="sourceLineNo">1285</span> }<a name="line.1285"></a> |
| <span class="sourceLineNo">1286</span> }<a name="line.1286"></a> |
| <span class="sourceLineNo">1287</span><a name="line.1287"></a> |
| <span class="sourceLineNo">1288</span> /**<a name="line.1288"></a> |
| <span class="sourceLineNo">1289</span> * Compute a cost of a potential cluster configuration based upon where<a name="line.1289"></a> |
| <span class="sourceLineNo">1290</span> * {@link org.apache.hadoop.hbase.regionserver.HStoreFile}s are located.<a name="line.1290"></a> |
| <span class="sourceLineNo">1291</span> */<a name="line.1291"></a> |
| <span class="sourceLineNo">1292</span> static abstract class LocalityBasedCostFunction extends CostFunction {<a name="line.1292"></a> |
| <span class="sourceLineNo">1293</span><a name="line.1293"></a> |
| <span class="sourceLineNo">1294</span> private final LocalityType type;<a name="line.1294"></a> |
| <span class="sourceLineNo">1295</span><a name="line.1295"></a> |
| <span class="sourceLineNo">1296</span> private double bestLocality; // best case locality across cluster weighted by local data size<a name="line.1296"></a> |
| <span class="sourceLineNo">1297</span> private double locality; // current locality across cluster weighted by local data size<a name="line.1297"></a> |
| <span class="sourceLineNo">1298</span><a name="line.1298"></a> |
| <span class="sourceLineNo">1299</span> private MasterServices services;<a name="line.1299"></a> |
| <span class="sourceLineNo">1300</span><a name="line.1300"></a> |
| <span class="sourceLineNo">1301</span> LocalityBasedCostFunction(Configuration conf,<a name="line.1301"></a> |
| <span class="sourceLineNo">1302</span> MasterServices srv,<a name="line.1302"></a> |
| <span class="sourceLineNo">1303</span> LocalityType type,<a name="line.1303"></a> |
| <span class="sourceLineNo">1304</span> String localityCostKey,<a name="line.1304"></a> |
| <span class="sourceLineNo">1305</span> float defaultLocalityCost) {<a name="line.1305"></a> |
| <span class="sourceLineNo">1306</span> super(conf);<a name="line.1306"></a> |
| <span class="sourceLineNo">1307</span> this.type = type;<a name="line.1307"></a> |
| <span class="sourceLineNo">1308</span> this.setMultiplier(conf.getFloat(localityCostKey, defaultLocalityCost));<a name="line.1308"></a> |
| <span class="sourceLineNo">1309</span> this.services = srv;<a name="line.1309"></a> |
| <span class="sourceLineNo">1310</span> this.locality = 0.0;<a name="line.1310"></a> |
| <span class="sourceLineNo">1311</span> this.bestLocality = 0.0;<a name="line.1311"></a> |
| <span class="sourceLineNo">1312</span> }<a name="line.1312"></a> |
| <span class="sourceLineNo">1313</span><a name="line.1313"></a> |
| <span class="sourceLineNo">1314</span> /**<a name="line.1314"></a> |
| <span class="sourceLineNo">1315</span> * Maps region to the current entity (server or rack) on which it is stored<a name="line.1315"></a> |
| <span class="sourceLineNo">1316</span> */<a name="line.1316"></a> |
| <span class="sourceLineNo">1317</span> abstract int regionIndexToEntityIndex(int region);<a name="line.1317"></a> |
| <span class="sourceLineNo">1318</span><a name="line.1318"></a> |
| <span class="sourceLineNo">1319</span> public void setServices(MasterServices srvc) {<a name="line.1319"></a> |
| <span class="sourceLineNo">1320</span> this.services = srvc;<a name="line.1320"></a> |
| <span class="sourceLineNo">1321</span> }<a name="line.1321"></a> |
| <span class="sourceLineNo">1322</span><a name="line.1322"></a> |
| <span class="sourceLineNo">1323</span> @Override<a name="line.1323"></a> |
| <span class="sourceLineNo">1324</span> void init(Cluster cluster) {<a name="line.1324"></a> |
| <span class="sourceLineNo">1325</span> super.init(cluster);<a name="line.1325"></a> |
| <span class="sourceLineNo">1326</span> locality = 0.0;<a name="line.1326"></a> |
| <span class="sourceLineNo">1327</span> bestLocality = 0.0;<a name="line.1327"></a> |
| <span class="sourceLineNo">1328</span><a name="line.1328"></a> |
| <span class="sourceLineNo">1329</span> // If no master, no computation will work, so assume 0 cost<a name="line.1329"></a> |
| <span class="sourceLineNo">1330</span> if (this.services == null) {<a name="line.1330"></a> |
| <span class="sourceLineNo">1331</span> return;<a name="line.1331"></a> |
| <span class="sourceLineNo">1332</span> }<a name="line.1332"></a> |
| <span class="sourceLineNo">1333</span><a name="line.1333"></a> |
| <span class="sourceLineNo">1334</span> for (int region = 0; region < cluster.numRegions; region++) {<a name="line.1334"></a> |
| <span class="sourceLineNo">1335</span> locality += getWeightedLocality(region, regionIndexToEntityIndex(region));<a name="line.1335"></a> |
| <span class="sourceLineNo">1336</span> bestLocality += getWeightedLocality(region, getMostLocalEntityForRegion(region));<a name="line.1336"></a> |
| <span class="sourceLineNo">1337</span> }<a name="line.1337"></a> |
| <span class="sourceLineNo">1338</span><a name="line.1338"></a> |
| <span class="sourceLineNo">1339</span> // We normalize locality to be a score between 0 and 1.0 representing how good it<a name="line.1339"></a> |
| <span class="sourceLineNo">1340</span> // is compared to how good it could be. If bestLocality is 0, assume locality is 100<a name="line.1340"></a> |
| <span class="sourceLineNo">1341</span> // (and the cost is 0)<a name="line.1341"></a> |
| <span class="sourceLineNo">1342</span> locality = bestLocality == 0 ? 1.0 : locality / bestLocality;<a name="line.1342"></a> |
| <span class="sourceLineNo">1343</span> }<a name="line.1343"></a> |
| <span class="sourceLineNo">1344</span><a name="line.1344"></a> |
| <span class="sourceLineNo">1345</span> @Override<a name="line.1345"></a> |
| <span class="sourceLineNo">1346</span> protected void regionMoved(int region, int oldServer, int newServer) {<a name="line.1346"></a> |
| <span class="sourceLineNo">1347</span> int oldEntity = type == LocalityType.SERVER ? oldServer : cluster.serverIndexToRackIndex[oldServer];<a name="line.1347"></a> |
| <span class="sourceLineNo">1348</span> int newEntity = type == LocalityType.SERVER ? newServer : cluster.serverIndexToRackIndex[newServer];<a name="line.1348"></a> |
| <span class="sourceLineNo">1349</span> if (this.services == null) {<a name="line.1349"></a> |
| <span class="sourceLineNo">1350</span> return;<a name="line.1350"></a> |
| <span class="sourceLineNo">1351</span> }<a name="line.1351"></a> |
| <span class="sourceLineNo">1352</span> double localityDelta = getWeightedLocality(region, newEntity) - getWeightedLocality(region, oldEntity);<a name="line.1352"></a> |
| <span class="sourceLineNo">1353</span> double normalizedDelta = bestLocality == 0 ? 0.0 : localityDelta / bestLocality;<a name="line.1353"></a> |
| <span class="sourceLineNo">1354</span> locality += normalizedDelta;<a name="line.1354"></a> |
| <span class="sourceLineNo">1355</span> }<a name="line.1355"></a> |
| <span class="sourceLineNo">1356</span><a name="line.1356"></a> |
| <span class="sourceLineNo">1357</span> @Override<a name="line.1357"></a> |
| <span class="sourceLineNo">1358</span> protected double cost() {<a name="line.1358"></a> |
| <span class="sourceLineNo">1359</span> return 1 - locality;<a name="line.1359"></a> |
| <span class="sourceLineNo">1360</span> }<a name="line.1360"></a> |
| <span class="sourceLineNo">1361</span><a name="line.1361"></a> |
| <span class="sourceLineNo">1362</span> private int getMostLocalEntityForRegion(int region) {<a name="line.1362"></a> |
| <span class="sourceLineNo">1363</span> return cluster.getOrComputeRegionsToMostLocalEntities(type)[region];<a name="line.1363"></a> |
| <span class="sourceLineNo">1364</span> }<a name="line.1364"></a> |
| <span class="sourceLineNo">1365</span><a name="line.1365"></a> |
| <span class="sourceLineNo">1366</span> private double getWeightedLocality(int region, int entity) {<a name="line.1366"></a> |
| <span class="sourceLineNo">1367</span> return cluster.getOrComputeWeightedLocality(region, entity, type);<a name="line.1367"></a> |
| <span class="sourceLineNo">1368</span> }<a name="line.1368"></a> |
| <span class="sourceLineNo">1369</span><a name="line.1369"></a> |
| <span class="sourceLineNo">1370</span> }<a name="line.1370"></a> |
| <span class="sourceLineNo">1371</span><a name="line.1371"></a> |
| <span class="sourceLineNo">1372</span> static class ServerLocalityCostFunction extends LocalityBasedCostFunction {<a name="line.1372"></a> |
| <span class="sourceLineNo">1373</span><a name="line.1373"></a> |
| <span class="sourceLineNo">1374</span> private static final String LOCALITY_COST_KEY = "hbase.master.balancer.stochastic.localityCost";<a name="line.1374"></a> |
| <span class="sourceLineNo">1375</span> private static final float DEFAULT_LOCALITY_COST = 25;<a name="line.1375"></a> |
| <span class="sourceLineNo">1376</span><a name="line.1376"></a> |
| <span class="sourceLineNo">1377</span> ServerLocalityCostFunction(Configuration conf, MasterServices srv) {<a name="line.1377"></a> |
| <span class="sourceLineNo">1378</span> super(<a name="line.1378"></a> |
| <span class="sourceLineNo">1379</span> conf,<a name="line.1379"></a> |
| <span class="sourceLineNo">1380</span> srv,<a name="line.1380"></a> |
| <span class="sourceLineNo">1381</span> LocalityType.SERVER,<a name="line.1381"></a> |
| <span class="sourceLineNo">1382</span> LOCALITY_COST_KEY,<a name="line.1382"></a> |
| <span class="sourceLineNo">1383</span> DEFAULT_LOCALITY_COST<a name="line.1383"></a> |
| <span class="sourceLineNo">1384</span> );<a name="line.1384"></a> |
| <span class="sourceLineNo">1385</span> }<a name="line.1385"></a> |
| <span class="sourceLineNo">1386</span><a name="line.1386"></a> |
| <span class="sourceLineNo">1387</span> @Override<a name="line.1387"></a> |
| <span class="sourceLineNo">1388</span> int regionIndexToEntityIndex(int region) {<a name="line.1388"></a> |
| <span class="sourceLineNo">1389</span> return cluster.regionIndexToServerIndex[region];<a name="line.1389"></a> |
| <span class="sourceLineNo">1390</span> }<a name="line.1390"></a> |
| <span class="sourceLineNo">1391</span> }<a name="line.1391"></a> |
| <span class="sourceLineNo">1392</span><a name="line.1392"></a> |
| <span class="sourceLineNo">1393</span> static class RackLocalityCostFunction extends LocalityBasedCostFunction {<a name="line.1393"></a> |
| <span class="sourceLineNo">1394</span><a name="line.1394"></a> |
| <span class="sourceLineNo">1395</span> private static final String RACK_LOCALITY_COST_KEY = "hbase.master.balancer.stochastic.rackLocalityCost";<a name="line.1395"></a> |
| <span class="sourceLineNo">1396</span> private static final float DEFAULT_RACK_LOCALITY_COST = 15;<a name="line.1396"></a> |
| <span class="sourceLineNo">1397</span><a name="line.1397"></a> |
| <span class="sourceLineNo">1398</span> public RackLocalityCostFunction(Configuration conf, MasterServices services) {<a name="line.1398"></a> |
| <span class="sourceLineNo">1399</span> super(<a name="line.1399"></a> |
| <span class="sourceLineNo">1400</span> conf,<a name="line.1400"></a> |
| <span class="sourceLineNo">1401</span> services,<a name="line.1401"></a> |
| <span class="sourceLineNo">1402</span> LocalityType.RACK,<a name="line.1402"></a> |
| <span class="sourceLineNo">1403</span> RACK_LOCALITY_COST_KEY,<a name="line.1403"></a> |
| <span class="sourceLineNo">1404</span> DEFAULT_RACK_LOCALITY_COST<a name="line.1404"></a> |
| <span class="sourceLineNo">1405</span> );<a name="line.1405"></a> |
| <span class="sourceLineNo">1406</span> }<a name="line.1406"></a> |
| <span class="sourceLineNo">1407</span><a name="line.1407"></a> |
| <span class="sourceLineNo">1408</span> @Override<a name="line.1408"></a> |
| <span class="sourceLineNo">1409</span> int regionIndexToEntityIndex(int region) {<a name="line.1409"></a> |
| <span class="sourceLineNo">1410</span> return cluster.getRackForRegion(region);<a name="line.1410"></a> |
| <span class="sourceLineNo">1411</span> }<a name="line.1411"></a> |
| <span class="sourceLineNo">1412</span> }<a name="line.1412"></a> |
| <span class="sourceLineNo">1413</span><a name="line.1413"></a> |
| <span class="sourceLineNo">1414</span> /**<a name="line.1414"></a> |
| <span class="sourceLineNo">1415</span> * Base class the allows writing costs functions from rolling average of some<a name="line.1415"></a> |
| <span class="sourceLineNo">1416</span> * number from RegionLoad.<a name="line.1416"></a> |
| <span class="sourceLineNo">1417</span> */<a name="line.1417"></a> |
| <span class="sourceLineNo">1418</span> abstract static class CostFromRegionLoadFunction extends CostFunction {<a name="line.1418"></a> |
| <span class="sourceLineNo">1419</span><a name="line.1419"></a> |
| <span class="sourceLineNo">1420</span> private ClusterMetrics clusterStatus = null;<a name="line.1420"></a> |
| <span class="sourceLineNo">1421</span> private Map<String, Deque<BalancerRegionLoad>> loads = null;<a name="line.1421"></a> |
| <span class="sourceLineNo">1422</span> private double[] stats = null;<a name="line.1422"></a> |
| <span class="sourceLineNo">1423</span> CostFromRegionLoadFunction(Configuration conf) {<a name="line.1423"></a> |
| <span class="sourceLineNo">1424</span> super(conf);<a name="line.1424"></a> |
| <span class="sourceLineNo">1425</span> }<a name="line.1425"></a> |
| <span class="sourceLineNo">1426</span><a name="line.1426"></a> |
| <span class="sourceLineNo">1427</span> void setClusterMetrics(ClusterMetrics status) {<a name="line.1427"></a> |
| <span class="sourceLineNo">1428</span> this.clusterStatus = status;<a name="line.1428"></a> |
| <span class="sourceLineNo">1429</span> }<a name="line.1429"></a> |
| <span class="sourceLineNo">1430</span><a name="line.1430"></a> |
| <span class="sourceLineNo">1431</span> void setLoads(Map<String, Deque<BalancerRegionLoad>> l) {<a name="line.1431"></a> |
| <span class="sourceLineNo">1432</span> this.loads = l;<a name="line.1432"></a> |
| <span class="sourceLineNo">1433</span> }<a name="line.1433"></a> |
| <span class="sourceLineNo">1434</span><a name="line.1434"></a> |
| <span class="sourceLineNo">1435</span> @Override<a name="line.1435"></a> |
| <span class="sourceLineNo">1436</span> protected double cost() {<a name="line.1436"></a> |
| <span class="sourceLineNo">1437</span> if (clusterStatus == null || loads == null) {<a name="line.1437"></a> |
| <span class="sourceLineNo">1438</span> return 0;<a name="line.1438"></a> |
| <span class="sourceLineNo">1439</span> }<a name="line.1439"></a> |
| <span class="sourceLineNo">1440</span><a name="line.1440"></a> |
| <span class="sourceLineNo">1441</span> if (stats == null || stats.length != cluster.numServers) {<a name="line.1441"></a> |
| <span class="sourceLineNo">1442</span> stats = new double[cluster.numServers];<a name="line.1442"></a> |
| <span class="sourceLineNo">1443</span> }<a name="line.1443"></a> |
| <span class="sourceLineNo">1444</span><a name="line.1444"></a> |
| <span class="sourceLineNo">1445</span> for (int i =0; i < stats.length; i++) {<a name="line.1445"></a> |
| <span class="sourceLineNo">1446</span> //Cost this server has from RegionLoad<a name="line.1446"></a> |
| <span class="sourceLineNo">1447</span> long cost = 0;<a name="line.1447"></a> |
| <span class="sourceLineNo">1448</span><a name="line.1448"></a> |
| <span class="sourceLineNo">1449</span> // for every region on this server get the rl<a name="line.1449"></a> |
| <span class="sourceLineNo">1450</span> for(int regionIndex:cluster.regionsPerServer[i]) {<a name="line.1450"></a> |
| <span class="sourceLineNo">1451</span> Collection<BalancerRegionLoad> regionLoadList = cluster.regionLoads[regionIndex];<a name="line.1451"></a> |
| <span class="sourceLineNo">1452</span><a name="line.1452"></a> |
| <span class="sourceLineNo">1453</span> // Now if we found a region load get the type of cost that was requested.<a name="line.1453"></a> |
| <span class="sourceLineNo">1454</span> if (regionLoadList != null) {<a name="line.1454"></a> |
| <span class="sourceLineNo">1455</span> cost = (long) (cost + getRegionLoadCost(regionLoadList));<a name="line.1455"></a> |
| <span class="sourceLineNo">1456</span> }<a name="line.1456"></a> |
| <span class="sourceLineNo">1457</span> }<a name="line.1457"></a> |
| <span class="sourceLineNo">1458</span><a name="line.1458"></a> |
| <span class="sourceLineNo">1459</span> // Add the total cost to the stats.<a name="line.1459"></a> |
| <span class="sourceLineNo">1460</span> stats[i] = cost;<a name="line.1460"></a> |
| <span class="sourceLineNo">1461</span> }<a name="line.1461"></a> |
| <span class="sourceLineNo">1462</span><a name="line.1462"></a> |
| <span class="sourceLineNo">1463</span> // Now return the scaled cost from data held in the stats object.<a name="line.1463"></a> |
| <span class="sourceLineNo">1464</span> return costFromArray(stats);<a name="line.1464"></a> |
| <span class="sourceLineNo">1465</span> }<a name="line.1465"></a> |
| <span class="sourceLineNo">1466</span><a name="line.1466"></a> |
| <span class="sourceLineNo">1467</span> protected double getRegionLoadCost(Collection<BalancerRegionLoad> regionLoadList) {<a name="line.1467"></a> |
| <span class="sourceLineNo">1468</span> double cost = 0;<a name="line.1468"></a> |
| <span class="sourceLineNo">1469</span> for (BalancerRegionLoad rl : regionLoadList) {<a name="line.1469"></a> |
| <span class="sourceLineNo">1470</span> cost += getCostFromRl(rl);<a name="line.1470"></a> |
| <span class="sourceLineNo">1471</span> }<a name="line.1471"></a> |
| <span class="sourceLineNo">1472</span> return cost / regionLoadList.size();<a name="line.1472"></a> |
| <span class="sourceLineNo">1473</span> }<a name="line.1473"></a> |
| <span class="sourceLineNo">1474</span><a name="line.1474"></a> |
| <span class="sourceLineNo">1475</span> protected abstract double getCostFromRl(BalancerRegionLoad rl);<a name="line.1475"></a> |
| <span class="sourceLineNo">1476</span> }<a name="line.1476"></a> |
| <span class="sourceLineNo">1477</span><a name="line.1477"></a> |
| <span class="sourceLineNo">1478</span> /**<a name="line.1478"></a> |
| <span class="sourceLineNo">1479</span> * Class to be used for the subset of RegionLoad costs that should be treated as rates.<a name="line.1479"></a> |
| <span class="sourceLineNo">1480</span> * We do not compare about the actual rate in requests per second but rather the rate relative<a name="line.1480"></a> |
| <span class="sourceLineNo">1481</span> * to the rest of the regions.<a name="line.1481"></a> |
| <span class="sourceLineNo">1482</span> */<a name="line.1482"></a> |
| <span class="sourceLineNo">1483</span> abstract static class CostFromRegionLoadAsRateFunction extends CostFromRegionLoadFunction {<a name="line.1483"></a> |
| <span class="sourceLineNo">1484</span><a name="line.1484"></a> |
| <span class="sourceLineNo">1485</span> CostFromRegionLoadAsRateFunction(Configuration conf) {<a name="line.1485"></a> |
| <span class="sourceLineNo">1486</span> super(conf);<a name="line.1486"></a> |
| <span class="sourceLineNo">1487</span> }<a name="line.1487"></a> |
| <span class="sourceLineNo">1488</span><a name="line.1488"></a> |
| <span class="sourceLineNo">1489</span> @Override<a name="line.1489"></a> |
| <span class="sourceLineNo">1490</span> protected double getRegionLoadCost(Collection<BalancerRegionLoad> regionLoadList) {<a name="line.1490"></a> |
| <span class="sourceLineNo">1491</span> double cost = 0;<a name="line.1491"></a> |
| <span class="sourceLineNo">1492</span> double previous = 0;<a name="line.1492"></a> |
| <span class="sourceLineNo">1493</span> boolean isFirst = true;<a name="line.1493"></a> |
| <span class="sourceLineNo">1494</span> for (BalancerRegionLoad rl : regionLoadList) {<a name="line.1494"></a> |
| <span class="sourceLineNo">1495</span> double current = getCostFromRl(rl);<a name="line.1495"></a> |
| <span class="sourceLineNo">1496</span> if (isFirst) {<a name="line.1496"></a> |
| <span class="sourceLineNo">1497</span> isFirst = false;<a name="line.1497"></a> |
| <span class="sourceLineNo">1498</span> } else {<a name="line.1498"></a> |
| <span class="sourceLineNo">1499</span> cost += current - previous;<a name="line.1499"></a> |
| <span class="sourceLineNo">1500</span> }<a name="line.1500"></a> |
| <span class="sourceLineNo">1501</span> previous = current;<a name="line.1501"></a> |
| <span class="sourceLineNo">1502</span> }<a name="line.1502"></a> |
| <span class="sourceLineNo">1503</span> return Math.max(0, cost / (regionLoadList.size() - 1));<a name="line.1503"></a> |
| <span class="sourceLineNo">1504</span> }<a name="line.1504"></a> |
| <span class="sourceLineNo">1505</span> }<a name="line.1505"></a> |
| <span class="sourceLineNo">1506</span><a name="line.1506"></a> |
| <span class="sourceLineNo">1507</span> /**<a name="line.1507"></a> |
| <span class="sourceLineNo">1508</span> * Compute the cost of total number of read requests The more unbalanced the higher the<a name="line.1508"></a> |
| <span class="sourceLineNo">1509</span> * computed cost will be. This uses a rolling average of regionload.<a name="line.1509"></a> |
| <span class="sourceLineNo">1510</span> */<a name="line.1510"></a> |
| <span class="sourceLineNo">1511</span><a name="line.1511"></a> |
| <span class="sourceLineNo">1512</span> static class ReadRequestCostFunction extends CostFromRegionLoadAsRateFunction {<a name="line.1512"></a> |
| <span class="sourceLineNo">1513</span><a name="line.1513"></a> |
| <span class="sourceLineNo">1514</span> private static final String READ_REQUEST_COST_KEY =<a name="line.1514"></a> |
| <span class="sourceLineNo">1515</span> "hbase.master.balancer.stochastic.readRequestCost";<a name="line.1515"></a> |
| <span class="sourceLineNo">1516</span> private static final float DEFAULT_READ_REQUEST_COST = 5;<a name="line.1516"></a> |
| <span class="sourceLineNo">1517</span><a name="line.1517"></a> |
| <span class="sourceLineNo">1518</span> ReadRequestCostFunction(Configuration conf) {<a name="line.1518"></a> |
| <span class="sourceLineNo">1519</span> super(conf);<a name="line.1519"></a> |
| <span class="sourceLineNo">1520</span> this.setMultiplier(conf.getFloat(READ_REQUEST_COST_KEY, DEFAULT_READ_REQUEST_COST));<a name="line.1520"></a> |
| <span class="sourceLineNo">1521</span> }<a name="line.1521"></a> |
| <span class="sourceLineNo">1522</span><a name="line.1522"></a> |
| <span class="sourceLineNo">1523</span> @Override<a name="line.1523"></a> |
| <span class="sourceLineNo">1524</span> protected double getCostFromRl(BalancerRegionLoad rl) {<a name="line.1524"></a> |
| <span class="sourceLineNo">1525</span> return rl.getReadRequestsCount();<a name="line.1525"></a> |
| <span class="sourceLineNo">1526</span> }<a name="line.1526"></a> |
| <span class="sourceLineNo">1527</span> }<a name="line.1527"></a> |
| <span class="sourceLineNo">1528</span><a name="line.1528"></a> |
| <span class="sourceLineNo">1529</span> /**<a name="line.1529"></a> |
| <span class="sourceLineNo">1530</span> * Compute the cost of total number of coprocessor requests The more unbalanced the higher the<a name="line.1530"></a> |
| <span class="sourceLineNo">1531</span> * computed cost will be. This uses a rolling average of regionload.<a name="line.1531"></a> |
| <span class="sourceLineNo">1532</span> */<a name="line.1532"></a> |
| <span class="sourceLineNo">1533</span><a name="line.1533"></a> |
| <span class="sourceLineNo">1534</span> static class CPRequestCostFunction extends CostFromRegionLoadAsRateFunction {<a name="line.1534"></a> |
| <span class="sourceLineNo">1535</span><a name="line.1535"></a> |
| <span class="sourceLineNo">1536</span> private static final String CP_REQUEST_COST_KEY =<a name="line.1536"></a> |
| <span class="sourceLineNo">1537</span> "hbase.master.balancer.stochastic.cpRequestCost";<a name="line.1537"></a> |
| <span class="sourceLineNo">1538</span> private static final float DEFAULT_CP_REQUEST_COST = 5;<a name="line.1538"></a> |
| <span class="sourceLineNo">1539</span><a name="line.1539"></a> |
| <span class="sourceLineNo">1540</span> CPRequestCostFunction(Configuration conf) {<a name="line.1540"></a> |
| <span class="sourceLineNo">1541</span> super(conf);<a name="line.1541"></a> |
| <span class="sourceLineNo">1542</span> this.setMultiplier(conf.getFloat(CP_REQUEST_COST_KEY, DEFAULT_CP_REQUEST_COST));<a name="line.1542"></a> |
| <span class="sourceLineNo">1543</span> }<a name="line.1543"></a> |
| <span class="sourceLineNo">1544</span><a name="line.1544"></a> |
| <span class="sourceLineNo">1545</span> @Override<a name="line.1545"></a> |
| <span class="sourceLineNo">1546</span> protected double getCostFromRl(BalancerRegionLoad rl) {<a name="line.1546"></a> |
| <span class="sourceLineNo">1547</span> return rl.getCpRequestsCount();<a name="line.1547"></a> |
| <span class="sourceLineNo">1548</span> }<a name="line.1548"></a> |
| <span class="sourceLineNo">1549</span> }<a name="line.1549"></a> |
| <span class="sourceLineNo">1550</span><a name="line.1550"></a> |
| <span class="sourceLineNo">1551</span> /**<a name="line.1551"></a> |
| <span class="sourceLineNo">1552</span> * Compute the cost of total number of write requests. The more unbalanced the higher the<a name="line.1552"></a> |
| <span class="sourceLineNo">1553</span> * computed cost will be. This uses a rolling average of regionload.<a name="line.1553"></a> |
| <span class="sourceLineNo">1554</span> */<a name="line.1554"></a> |
| <span class="sourceLineNo">1555</span> static class WriteRequestCostFunction extends CostFromRegionLoadAsRateFunction {<a name="line.1555"></a> |
| <span class="sourceLineNo">1556</span><a name="line.1556"></a> |
| <span class="sourceLineNo">1557</span> private static final String WRITE_REQUEST_COST_KEY =<a name="line.1557"></a> |
| <span class="sourceLineNo">1558</span> "hbase.master.balancer.stochastic.writeRequestCost";<a name="line.1558"></a> |
| <span class="sourceLineNo">1559</span> private static final float DEFAULT_WRITE_REQUEST_COST = 5;<a name="line.1559"></a> |
| <span class="sourceLineNo">1560</span><a name="line.1560"></a> |
| <span class="sourceLineNo">1561</span> WriteRequestCostFunction(Configuration conf) {<a name="line.1561"></a> |
| <span class="sourceLineNo">1562</span> super(conf);<a name="line.1562"></a> |
| <span class="sourceLineNo">1563</span> this.setMultiplier(conf.getFloat(WRITE_REQUEST_COST_KEY, DEFAULT_WRITE_REQUEST_COST));<a name="line.1563"></a> |
| <span class="sourceLineNo">1564</span> }<a name="line.1564"></a> |
| <span class="sourceLineNo">1565</span><a name="line.1565"></a> |
| <span class="sourceLineNo">1566</span> @Override<a name="line.1566"></a> |
| <span class="sourceLineNo">1567</span> protected double getCostFromRl(BalancerRegionLoad rl) {<a name="line.1567"></a> |
| <span class="sourceLineNo">1568</span> return rl.getWriteRequestsCount();<a name="line.1568"></a> |
| <span class="sourceLineNo">1569</span> }<a name="line.1569"></a> |
| <span class="sourceLineNo">1570</span> }<a name="line.1570"></a> |
| <span class="sourceLineNo">1571</span><a name="line.1571"></a> |
| <span class="sourceLineNo">1572</span> /**<a name="line.1572"></a> |
| <span class="sourceLineNo">1573</span> * A cost function for region replicas. We give a very high cost to hosting<a name="line.1573"></a> |
| <span class="sourceLineNo">1574</span> * replicas of the same region in the same host. We do not prevent the case<a name="line.1574"></a> |
| <span class="sourceLineNo">1575</span> * though, since if numReplicas > numRegionServers, we still want to keep the<a name="line.1575"></a> |
| <span class="sourceLineNo">1576</span> * replica open.<a name="line.1576"></a> |
| <span class="sourceLineNo">1577</span> */<a name="line.1577"></a> |
| <span class="sourceLineNo">1578</span> static class RegionReplicaHostCostFunction extends CostFunction {<a name="line.1578"></a> |
| <span class="sourceLineNo">1579</span> private static final String REGION_REPLICA_HOST_COST_KEY =<a name="line.1579"></a> |
| <span class="sourceLineNo">1580</span> "hbase.master.balancer.stochastic.regionReplicaHostCostKey";<a name="line.1580"></a> |
| <span class="sourceLineNo">1581</span> private static final float DEFAULT_REGION_REPLICA_HOST_COST_KEY = 100000;<a name="line.1581"></a> |
| <span class="sourceLineNo">1582</span><a name="line.1582"></a> |
| <span class="sourceLineNo">1583</span> long maxCost = 0;<a name="line.1583"></a> |
| <span class="sourceLineNo">1584</span> long[] costsPerGroup; // group is either server, host or rack<a name="line.1584"></a> |
| <span class="sourceLineNo">1585</span> int[][] primariesOfRegionsPerGroup;<a name="line.1585"></a> |
| <span class="sourceLineNo">1586</span><a name="line.1586"></a> |
| <span class="sourceLineNo">1587</span> public RegionReplicaHostCostFunction(Configuration conf) {<a name="line.1587"></a> |
| <span class="sourceLineNo">1588</span> super(conf);<a name="line.1588"></a> |
| <span class="sourceLineNo">1589</span> this.setMultiplier(conf.getFloat(REGION_REPLICA_HOST_COST_KEY,<a name="line.1589"></a> |
| <span class="sourceLineNo">1590</span> DEFAULT_REGION_REPLICA_HOST_COST_KEY));<a name="line.1590"></a> |
| <span class="sourceLineNo">1591</span> }<a name="line.1591"></a> |
| <span class="sourceLineNo">1592</span><a name="line.1592"></a> |
| <span class="sourceLineNo">1593</span> @Override<a name="line.1593"></a> |
| <span class="sourceLineNo">1594</span> void init(Cluster cluster) {<a name="line.1594"></a> |
| <span class="sourceLineNo">1595</span> super.init(cluster);<a name="line.1595"></a> |
| <span class="sourceLineNo">1596</span> // max cost is the case where every region replica is hosted together regardless of host<a name="line.1596"></a> |
| <span class="sourceLineNo">1597</span> maxCost = cluster.numHosts > 1 ? getMaxCost(cluster) : 0;<a name="line.1597"></a> |
| <span class="sourceLineNo">1598</span> costsPerGroup = new long[cluster.numHosts];<a name="line.1598"></a> |
| <span class="sourceLineNo">1599</span> primariesOfRegionsPerGroup = cluster.multiServersPerHost // either server based or host based<a name="line.1599"></a> |
| <span class="sourceLineNo">1600</span> ? cluster.primariesOfRegionsPerHost<a name="line.1600"></a> |
| <span class="sourceLineNo">1601</span> : cluster.primariesOfRegionsPerServer;<a name="line.1601"></a> |
| <span class="sourceLineNo">1602</span> for (int i = 0 ; i < primariesOfRegionsPerGroup.length; i++) {<a name="line.1602"></a> |
| <span class="sourceLineNo">1603</span> costsPerGroup[i] = costPerGroup(primariesOfRegionsPerGroup[i]);<a name="line.1603"></a> |
| <span class="sourceLineNo">1604</span> }<a name="line.1604"></a> |
| <span class="sourceLineNo">1605</span> }<a name="line.1605"></a> |
| <span class="sourceLineNo">1606</span><a name="line.1606"></a> |
| <span class="sourceLineNo">1607</span> long getMaxCost(Cluster cluster) {<a name="line.1607"></a> |
| <span class="sourceLineNo">1608</span> if (!cluster.hasRegionReplicas) {<a name="line.1608"></a> |
| <span class="sourceLineNo">1609</span> return 0; // short circuit<a name="line.1609"></a> |
| <span class="sourceLineNo">1610</span> }<a name="line.1610"></a> |
| <span class="sourceLineNo">1611</span> // max cost is the case where every region replica is hosted together regardless of host<a name="line.1611"></a> |
| <span class="sourceLineNo">1612</span> int[] primariesOfRegions = new int[cluster.numRegions];<a name="line.1612"></a> |
| <span class="sourceLineNo">1613</span> System.arraycopy(cluster.regionIndexToPrimaryIndex, 0, primariesOfRegions, 0,<a name="line.1613"></a> |
| <span class="sourceLineNo">1614</span> cluster.regions.length);<a name="line.1614"></a> |
| <span class="sourceLineNo">1615</span><a name="line.1615"></a> |
| <span class="sourceLineNo">1616</span> Arrays.sort(primariesOfRegions);<a name="line.1616"></a> |
| <span class="sourceLineNo">1617</span><a name="line.1617"></a> |
| <span class="sourceLineNo">1618</span> // compute numReplicas from the sorted array<a name="line.1618"></a> |
| <span class="sourceLineNo">1619</span> return costPerGroup(primariesOfRegions);<a name="line.1619"></a> |
| <span class="sourceLineNo">1620</span> }<a name="line.1620"></a> |
| <span class="sourceLineNo">1621</span><a name="line.1621"></a> |
| <span class="sourceLineNo">1622</span> @Override<a name="line.1622"></a> |
| <span class="sourceLineNo">1623</span> boolean isNeeded() {<a name="line.1623"></a> |
| <span class="sourceLineNo">1624</span> return cluster.hasRegionReplicas;<a name="line.1624"></a> |
| <span class="sourceLineNo">1625</span> }<a name="line.1625"></a> |
| <span class="sourceLineNo">1626</span><a name="line.1626"></a> |
| <span class="sourceLineNo">1627</span> @Override<a name="line.1627"></a> |
| <span class="sourceLineNo">1628</span> protected double cost() {<a name="line.1628"></a> |
| <span class="sourceLineNo">1629</span> if (maxCost <= 0) {<a name="line.1629"></a> |
| <span class="sourceLineNo">1630</span> return 0;<a name="line.1630"></a> |
| <span class="sourceLineNo">1631</span> }<a name="line.1631"></a> |
| <span class="sourceLineNo">1632</span><a name="line.1632"></a> |
| <span class="sourceLineNo">1633</span> long totalCost = 0;<a name="line.1633"></a> |
| <span class="sourceLineNo">1634</span> for (int i = 0 ; i < costsPerGroup.length; i++) {<a name="line.1634"></a> |
| <span class="sourceLineNo">1635</span> totalCost += costsPerGroup[i];<a name="line.1635"></a> |
| <span class="sourceLineNo">1636</span> }<a name="line.1636"></a> |
| <span class="sourceLineNo">1637</span> return scale(0, maxCost, totalCost);<a name="line.1637"></a> |
| <span class="sourceLineNo">1638</span> }<a name="line.1638"></a> |
| <span class="sourceLineNo">1639</span><a name="line.1639"></a> |
| <span class="sourceLineNo">1640</span> /**<a name="line.1640"></a> |
| <span class="sourceLineNo">1641</span> * For each primary region, it computes the total number of replicas in the array (numReplicas)<a name="line.1641"></a> |
| <span class="sourceLineNo">1642</span> * and returns a sum of numReplicas-1 squared. For example, if the server hosts<a name="line.1642"></a> |
| <span class="sourceLineNo">1643</span> * regions a, b, c, d, e, f where a and b are same replicas, and c,d,e are same replicas, it<a name="line.1643"></a> |
| <span class="sourceLineNo">1644</span> * returns (2-1) * (2-1) + (3-1) * (3-1) + (1-1) * (1-1).<a name="line.1644"></a> |
| <span class="sourceLineNo">1645</span> * @param primariesOfRegions a sorted array of primary regions ids for the regions hosted<a name="line.1645"></a> |
| <span class="sourceLineNo">1646</span> * @return a sum of numReplicas-1 squared for each primary region in the group.<a name="line.1646"></a> |
| <span class="sourceLineNo">1647</span> */<a name="line.1647"></a> |
| <span class="sourceLineNo">1648</span> protected long costPerGroup(int[] primariesOfRegions) {<a name="line.1648"></a> |
| <span class="sourceLineNo">1649</span> long cost = 0;<a name="line.1649"></a> |
| <span class="sourceLineNo">1650</span> int currentPrimary = -1;<a name="line.1650"></a> |
| <span class="sourceLineNo">1651</span> int currentPrimaryIndex = -1;<a name="line.1651"></a> |
| <span class="sourceLineNo">1652</span> // primariesOfRegions is a sorted array of primary ids of regions. Replicas of regions<a name="line.1652"></a> |
| <span class="sourceLineNo">1653</span> // sharing the same primary will have consecutive numbers in the array.<a name="line.1653"></a> |
| <span class="sourceLineNo">1654</span> for (int j = 0 ; j <= primariesOfRegions.length; j++) {<a name="line.1654"></a> |
| <span class="sourceLineNo">1655</span> int primary = j < primariesOfRegions.length ? primariesOfRegions[j] : -1;<a name="line.1655"></a> |
| <span class="sourceLineNo">1656</span> if (primary != currentPrimary) { // we see a new primary<a name="line.1656"></a> |
| <span class="sourceLineNo">1657</span> int numReplicas = j - currentPrimaryIndex;<a name="line.1657"></a> |
| <span class="sourceLineNo">1658</span> // square the cost<a name="line.1658"></a> |
| <span class="sourceLineNo">1659</span> if (numReplicas > 1) { // means consecutive primaries, indicating co-location<a name="line.1659"></a> |
| <span class="sourceLineNo">1660</span> cost += (numReplicas - 1) * (numReplicas - 1);<a name="line.1660"></a> |
| <span class="sourceLineNo">1661</span> }<a name="line.1661"></a> |
| <span class="sourceLineNo">1662</span> currentPrimary = primary;<a name="line.1662"></a> |
| <span class="sourceLineNo">1663</span> currentPrimaryIndex = j;<a name="line.1663"></a> |
| <span class="sourceLineNo">1664</span> }<a name="line.1664"></a> |
| <span class="sourceLineNo">1665</span> }<a name="line.1665"></a> |
| <span class="sourceLineNo">1666</span><a name="line.1666"></a> |
| <span class="sourceLineNo">1667</span> return cost;<a name="line.1667"></a> |
| <span class="sourceLineNo">1668</span> }<a name="line.1668"></a> |
| <span class="sourceLineNo">1669</span><a name="line.1669"></a> |
| <span class="sourceLineNo">1670</span> @Override<a name="line.1670"></a> |
| <span class="sourceLineNo">1671</span> protected void regionMoved(int region, int oldServer, int newServer) {<a name="line.1671"></a> |
| <span class="sourceLineNo">1672</span> if (maxCost <= 0) {<a name="line.1672"></a> |
| <span class="sourceLineNo">1673</span> return; // no need to compute<a name="line.1673"></a> |
| <span class="sourceLineNo">1674</span> }<a name="line.1674"></a> |
| <span class="sourceLineNo">1675</span> if (cluster.multiServersPerHost) {<a name="line.1675"></a> |
| <span class="sourceLineNo">1676</span> int oldHost = cluster.serverIndexToHostIndex[oldServer];<a name="line.1676"></a> |
| <span class="sourceLineNo">1677</span> int newHost = cluster.serverIndexToHostIndex[newServer];<a name="line.1677"></a> |
| <span class="sourceLineNo">1678</span> if (newHost != oldHost) {<a name="line.1678"></a> |
| <span class="sourceLineNo">1679</span> costsPerGroup[oldHost] = costPerGroup(cluster.primariesOfRegionsPerHost[oldHost]);<a name="line.1679"></a> |
| <span class="sourceLineNo">1680</span> costsPerGroup[newHost] = costPerGroup(cluster.primariesOfRegionsPerHost[newHost]);<a name="line.1680"></a> |
| <span class="sourceLineNo">1681</span> }<a name="line.1681"></a> |
| <span class="sourceLineNo">1682</span> } else {<a name="line.1682"></a> |
| <span class="sourceLineNo">1683</span> costsPerGroup[oldServer] = costPerGroup(cluster.primariesOfRegionsPerServer[oldServer]);<a name="line.1683"></a> |
| <span class="sourceLineNo">1684</span> costsPerGroup[newServer] = costPerGroup(cluster.primariesOfRegionsPerServer[newServer]);<a name="line.1684"></a> |
| <span class="sourceLineNo">1685</span> }<a name="line.1685"></a> |
| <span class="sourceLineNo">1686</span> }<a name="line.1686"></a> |
| <span class="sourceLineNo">1687</span> }<a name="line.1687"></a> |
| <span class="sourceLineNo">1688</span><a name="line.1688"></a> |
| <span class="sourceLineNo">1689</span> /**<a name="line.1689"></a> |
| <span class="sourceLineNo">1690</span> * A cost function for region replicas for the rack distribution. We give a relatively high<a name="line.1690"></a> |
| <span class="sourceLineNo">1691</span> * cost to hosting replicas of the same region in the same rack. We do not prevent the case<a name="line.1691"></a> |
| <span class="sourceLineNo">1692</span> * though.<a name="line.1692"></a> |
| <span class="sourceLineNo">1693</span> */<a name="line.1693"></a> |
| <span class="sourceLineNo">1694</span> static class RegionReplicaRackCostFunction extends RegionReplicaHostCostFunction {<a name="line.1694"></a> |
| <span class="sourceLineNo">1695</span> private static final String REGION_REPLICA_RACK_COST_KEY =<a name="line.1695"></a> |
| <span class="sourceLineNo">1696</span> "hbase.master.balancer.stochastic.regionReplicaRackCostKey";<a name="line.1696"></a> |
| <span class="sourceLineNo">1697</span> private static final float DEFAULT_REGION_REPLICA_RACK_COST_KEY = 10000;<a name="line.1697"></a> |
| <span class="sourceLineNo">1698</span><a name="line.1698"></a> |
| <span class="sourceLineNo">1699</span> public RegionReplicaRackCostFunction(Configuration conf) {<a name="line.1699"></a> |
| <span class="sourceLineNo">1700</span> super(conf);<a name="line.1700"></a> |
| <span class="sourceLineNo">1701</span> this.setMultiplier(conf.getFloat(REGION_REPLICA_RACK_COST_KEY,<a name="line.1701"></a> |
| <span class="sourceLineNo">1702</span> DEFAULT_REGION_REPLICA_RACK_COST_KEY));<a name="line.1702"></a> |
| <span class="sourceLineNo">1703</span> }<a name="line.1703"></a> |
| <span class="sourceLineNo">1704</span><a name="line.1704"></a> |
| <span class="sourceLineNo">1705</span> @Override<a name="line.1705"></a> |
| <span class="sourceLineNo">1706</span> void init(Cluster cluster) {<a name="line.1706"></a> |
| <span class="sourceLineNo">1707</span> this.cluster = cluster;<a name="line.1707"></a> |
| <span class="sourceLineNo">1708</span> if (cluster.numRacks <= 1) {<a name="line.1708"></a> |
| <span class="sourceLineNo">1709</span> maxCost = 0;<a name="line.1709"></a> |
| <span class="sourceLineNo">1710</span> return; // disabled for 1 rack<a name="line.1710"></a> |
| <span class="sourceLineNo">1711</span> }<a name="line.1711"></a> |
| <span class="sourceLineNo">1712</span> // max cost is the case where every region replica is hosted together regardless of rack<a name="line.1712"></a> |
| <span class="sourceLineNo">1713</span> maxCost = getMaxCost(cluster);<a name="line.1713"></a> |
| <span class="sourceLineNo">1714</span> costsPerGroup = new long[cluster.numRacks];<a name="line.1714"></a> |
| <span class="sourceLineNo">1715</span> for (int i = 0 ; i < cluster.primariesOfRegionsPerRack.length; i++) {<a name="line.1715"></a> |
| <span class="sourceLineNo">1716</span> costsPerGroup[i] = costPerGroup(cluster.primariesOfRegionsPerRack[i]);<a name="line.1716"></a> |
| <span class="sourceLineNo">1717</span> }<a name="line.1717"></a> |
| <span class="sourceLineNo">1718</span> }<a name="line.1718"></a> |
| <span class="sourceLineNo">1719</span><a name="line.1719"></a> |
| <span class="sourceLineNo">1720</span> @Override<a name="line.1720"></a> |
| <span class="sourceLineNo">1721</span> protected void regionMoved(int region, int oldServer, int newServer) {<a name="line.1721"></a> |
| <span class="sourceLineNo">1722</span> if (maxCost <= 0) {<a name="line.1722"></a> |
| <span class="sourceLineNo">1723</span> return; // no need to compute<a name="line.1723"></a> |
| <span class="sourceLineNo">1724</span> }<a name="line.1724"></a> |
| <span class="sourceLineNo">1725</span> int oldRack = cluster.serverIndexToRackIndex[oldServer];<a name="line.1725"></a> |
| <span class="sourceLineNo">1726</span> int newRack = cluster.serverIndexToRackIndex[newServer];<a name="line.1726"></a> |
| <span class="sourceLineNo">1727</span> if (newRack != oldRack) {<a name="line.1727"></a> |
| <span class="sourceLineNo">1728</span> costsPerGroup[oldRack] = costPerGroup(cluster.primariesOfRegionsPerRack[oldRack]);<a name="line.1728"></a> |
| <span class="sourceLineNo">1729</span> costsPerGroup[newRack] = costPerGroup(cluster.primariesOfRegionsPerRack[newRack]);<a name="line.1729"></a> |
| <span class="sourceLineNo">1730</span> }<a name="line.1730"></a> |
| <span class="sourceLineNo">1731</span> }<a name="line.1731"></a> |
| <span class="sourceLineNo">1732</span> }<a name="line.1732"></a> |
| <span class="sourceLineNo">1733</span><a name="line.1733"></a> |
| <span class="sourceLineNo">1734</span> /**<a name="line.1734"></a> |
| <span class="sourceLineNo">1735</span> * Compute the cost of total memstore size. The more unbalanced the higher the<a name="line.1735"></a> |
| <span class="sourceLineNo">1736</span> * computed cost will be. This uses a rolling average of regionload.<a name="line.1736"></a> |
| <span class="sourceLineNo">1737</span> */<a name="line.1737"></a> |
| <span class="sourceLineNo">1738</span> static class MemStoreSizeCostFunction extends CostFromRegionLoadAsRateFunction {<a name="line.1738"></a> |
| <span class="sourceLineNo">1739</span><a name="line.1739"></a> |
| <span class="sourceLineNo">1740</span> private static final String MEMSTORE_SIZE_COST_KEY =<a name="line.1740"></a> |
| <span class="sourceLineNo">1741</span> "hbase.master.balancer.stochastic.memstoreSizeCost";<a name="line.1741"></a> |
| <span class="sourceLineNo">1742</span> private static final float DEFAULT_MEMSTORE_SIZE_COST = 5;<a name="line.1742"></a> |
| <span class="sourceLineNo">1743</span><a name="line.1743"></a> |
| <span class="sourceLineNo">1744</span> MemStoreSizeCostFunction(Configuration conf) {<a name="line.1744"></a> |
| <span class="sourceLineNo">1745</span> super(conf);<a name="line.1745"></a> |
| <span class="sourceLineNo">1746</span> this.setMultiplier(conf.getFloat(MEMSTORE_SIZE_COST_KEY, DEFAULT_MEMSTORE_SIZE_COST));<a name="line.1746"></a> |
| <span class="sourceLineNo">1747</span> }<a name="line.1747"></a> |
| <span class="sourceLineNo">1748</span><a name="line.1748"></a> |
| <span class="sourceLineNo">1749</span> @Override<a name="line.1749"></a> |
| <span class="sourceLineNo">1750</span> protected double getCostFromRl(BalancerRegionLoad rl) {<a name="line.1750"></a> |
| <span class="sourceLineNo">1751</span> return rl.getMemStoreSizeMB();<a name="line.1751"></a> |
| <span class="sourceLineNo">1752</span> }<a name="line.1752"></a> |
| <span class="sourceLineNo">1753</span> }<a name="line.1753"></a> |
| <span class="sourceLineNo">1754</span><a name="line.1754"></a> |
| <span class="sourceLineNo">1755</span> /**<a name="line.1755"></a> |
| <span class="sourceLineNo">1756</span> * Compute the cost of total open storefiles size. The more unbalanced the higher the<a name="line.1756"></a> |
| <span class="sourceLineNo">1757</span> * computed cost will be. This uses a rolling average of regionload.<a name="line.1757"></a> |
| <span class="sourceLineNo">1758</span> */<a name="line.1758"></a> |
| <span class="sourceLineNo">1759</span> static class StoreFileCostFunction extends CostFromRegionLoadFunction {<a name="line.1759"></a> |
| <span class="sourceLineNo">1760</span><a name="line.1760"></a> |
| <span class="sourceLineNo">1761</span> private static final String STOREFILE_SIZE_COST_KEY =<a name="line.1761"></a> |
| <span class="sourceLineNo">1762</span> "hbase.master.balancer.stochastic.storefileSizeCost";<a name="line.1762"></a> |
| <span class="sourceLineNo">1763</span> private static final float DEFAULT_STOREFILE_SIZE_COST = 5;<a name="line.1763"></a> |
| <span class="sourceLineNo">1764</span><a name="line.1764"></a> |
| <span class="sourceLineNo">1765</span> StoreFileCostFunction(Configuration conf) {<a name="line.1765"></a> |
| <span class="sourceLineNo">1766</span> super(conf);<a name="line.1766"></a> |
| <span class="sourceLineNo">1767</span> this.setMultiplier(conf.getFloat(STOREFILE_SIZE_COST_KEY, DEFAULT_STOREFILE_SIZE_COST));<a name="line.1767"></a> |
| <span class="sourceLineNo">1768</span> }<a name="line.1768"></a> |
| <span class="sourceLineNo">1769</span><a name="line.1769"></a> |
| <span class="sourceLineNo">1770</span> @Override<a name="line.1770"></a> |
| <span class="sourceLineNo">1771</span> protected double getCostFromRl(BalancerRegionLoad rl) {<a name="line.1771"></a> |
| <span class="sourceLineNo">1772</span> return rl.getStorefileSizeMB();<a name="line.1772"></a> |
| <span class="sourceLineNo">1773</span> }<a name="line.1773"></a> |
| <span class="sourceLineNo">1774</span> }<a name="line.1774"></a> |
| <span class="sourceLineNo">1775</span><a name="line.1775"></a> |
| <span class="sourceLineNo">1776</span> /**<a name="line.1776"></a> |
| <span class="sourceLineNo">1777</span> * A helper function to compose the attribute name from tablename and costfunction name<a name="line.1777"></a> |
| <span class="sourceLineNo">1778</span> */<a name="line.1778"></a> |
| <span class="sourceLineNo">1779</span> public static String composeAttributeName(String tableName, String costFunctionName) {<a name="line.1779"></a> |
| <span class="sourceLineNo">1780</span> return tableName + TABLE_FUNCTION_SEP + costFunctionName;<a name="line.1780"></a> |
| <span class="sourceLineNo">1781</span> }<a name="line.1781"></a> |
| <span class="sourceLineNo">1782</span>}<a name="line.1782"></a> |
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| </div> |
| </body> |
| </html> |
