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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import static org.apache.hadoop.hbase.regionserver.HeapMemoryManager.BLOCK_CACHE_SIZE_MAX_RANGE_KEY;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import static org.apache.hadoop.hbase.regionserver.HeapMemoryManager.BLOCK_CACHE_SIZE_MIN_RANGE_KEY;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import static org.apache.hadoop.hbase.HConstants.HFILE_BLOCK_CACHE_SIZE_KEY;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import static org.apache.hadoop.hbase.regionserver.HeapMemoryManager.MEMSTORE_SIZE_MAX_RANGE_KEY;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import static org.apache.hadoop.hbase.regionserver.HeapMemoryManager.MEMSTORE_SIZE_MIN_RANGE_KEY;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span><a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.slf4j.Logger;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.slf4j.LoggerFactory;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.conf.Configuration;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.HConstants;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.io.util.MemorySizeUtil;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.TunerContext;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.TunerResult;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.RollingStatCalculator;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span>/**<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * The default implementation for the HeapMemoryTuner. This will do statistical checks on<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * number of evictions, cache misses and flushes to decide whether there should be changes<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * in the heap size of memstore/block cache. During each tuner operation tuner takes a step<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * which can either be INCREASE_BLOCK_CACHE_SIZE (increase block cache size),<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> * INCREASE_MEMSTORE_SIZE (increase memstore size) and by default it is NEUTRAL (no change).<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * We say block cache is sufficient when there is no block cache eviction at all or major amount of<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> * memory allocated to block cache is empty, similarly we say memory allocated for memstore is<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> * sufficient when there is no memstore flushes because of heap pressure or major amount of<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> * memory allocated to memstore is empty. If both are sufficient we do nothing, if exactly one of<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * them is found to be sufficient we decrease its size by <i>step</i> and increase the other by<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> * same amount. If none of them is sufficient we do statistical analysis on number of cache misses<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> * and flushes to determine tuner direction. Based on these statistics we decide the tuner<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> * direction. If we are not confident about which step direction to take we do nothing and wait for<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> * next iteration. On expectation we will be tuning for at least 10% tuner calls. The number of<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * past periods to consider for statistics calculation can be specified in config by<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * <i>hbase.regionserver.heapmemory.autotuner.lookup.periods</i>. Also these many initial calls to<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * tuner will be ignored (cache is warming up and we leave the system to reach steady state).<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * After the tuner takes a step, in next call we insure that last call was indeed helpful and did<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> * not do us any harm. If not then we revert the previous step. The step size is dynamic and it<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> * changes based on current and past few tuning directions and their step sizes. We maintain a<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * parameter <i>decayingAvgTunerStepSize</i> which is sum of past tuner steps with<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * sign(positive for increase in memstore and negative for increase in block cache). But rather<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * than simple sum it is calculated by giving more priority to the recent tuning steps.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> * When last few tuner steps were NETURAL then we assume we are restarting the tuning process and<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * step size is updated to maximum allowed size which can be specified in config by<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * <i>hbase.regionserver.heapmemory.autotuner.step.max</i>. If in a particular tuning operation<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * the step direction is opposite to what indicated by <i>decayingTunerStepSizeSum</i><a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * we decrease the step size by half. Step size does not change in other tuning operations.<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * When step size gets below a certain threshold then the following tuner operations are<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * considered to be neutral. The minimum step size can be specified in config by<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * <i>hbase.regionserver.heapmemory.autotuner.step.min</i>.<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span>@InterfaceAudience.Private<a name="line.70"></a> |
| <span class="sourceLineNo">071</span>class DefaultHeapMemoryTuner implements HeapMemoryTuner {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> public static final String MAX_STEP_KEY = "hbase.regionserver.heapmemory.autotuner.step.max";<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> public static final String MIN_STEP_KEY = "hbase.regionserver.heapmemory.autotuner.step.min";<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> public static final String SUFFICIENT_MEMORY_LEVEL_KEY =<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> "hbase.regionserver.heapmemory.autotuner.sufficient.memory.level";<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> public static final String LOOKUP_PERIODS_KEY =<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> "hbase.regionserver.heapmemory.autotuner.lookup.periods";<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> public static final String NUM_PERIODS_TO_IGNORE =<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> "hbase.regionserver.heapmemory.autotuner.ignored.periods";<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> // Maximum step size that the tuner can take<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> public static final float DEFAULT_MAX_STEP_VALUE = 0.04f; // 4%<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> // Minimum step size that the tuner can take<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> public static final float DEFAULT_MIN_STEP_VALUE = 0.00125f; // 0.125%<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> // If current block cache size or memstore size in use is below this level relative to memory<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> // provided to it then corresponding component will be considered to have sufficient memory<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> public static final float DEFAULT_SUFFICIENT_MEMORY_LEVEL_VALUE = 0.5f; // 50%<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> // Number of tuner periods that will be considered while calculating mean and deviation<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> // If set to zero, all stats will be calculated from the start<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> public static final int DEFAULT_LOOKUP_PERIODS = 60;<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> public static final int DEFAULT_NUM_PERIODS_IGNORED = 60;<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> private static final TunerResult NO_OP_TUNER_RESULT = new TunerResult(false);<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> // If deviation of tuner step size gets below this value then it means past few periods were<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> // NEUTRAL(given that last tuner period was also NEUTRAL).<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> private static final double TUNER_STEP_EPS = 1e-6;<a name="line.94"></a> |
| <span class="sourceLineNo">095</span><a name="line.95"></a> |
| <span class="sourceLineNo">096</span> private Logger LOG = LoggerFactory.getLogger(DefaultHeapMemoryTuner.class);<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> private TunerResult TUNER_RESULT = new TunerResult(true);<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> private Configuration conf;<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> private float sufficientMemoryLevel = DEFAULT_SUFFICIENT_MEMORY_LEVEL_VALUE;<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> private float maximumStepSize = DEFAULT_MAX_STEP_VALUE;<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> private float minimumStepSize = DEFAULT_MIN_STEP_VALUE;<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> private int tunerLookupPeriods = DEFAULT_LOOKUP_PERIODS;<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> private int numPeriodsToIgnore = DEFAULT_NUM_PERIODS_IGNORED;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> // Counter to ignore few initial periods while cache is still warming up<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> // Memory tuner will do no operation for the first "tunerLookupPeriods"<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> private int ignoreInitialPeriods = 0;<a name="line.106"></a> |
| <span class="sourceLineNo">107</span><a name="line.107"></a> |
| <span class="sourceLineNo">108</span> private float globalMemStorePercentMinRange;<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> private float globalMemStorePercentMaxRange;<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> private float blockCachePercentMinRange;<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> private float blockCachePercentMaxRange;<a name="line.111"></a> |
| <span class="sourceLineNo">112</span><a name="line.112"></a> |
| <span class="sourceLineNo">113</span> private float globalMemStoreLimitLowMarkPercent;<a name="line.113"></a> |
| <span class="sourceLineNo">114</span><a name="line.114"></a> |
| <span class="sourceLineNo">115</span> // Store statistics about the corresponding parameters for memory tuning<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> private RollingStatCalculator rollingStatsForCacheMisses;<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> private RollingStatCalculator rollingStatsForFlushes;<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> private RollingStatCalculator rollingStatsForEvictions;<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> private RollingStatCalculator rollingStatsForTunerSteps;<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> // Set step size to max value for tuning, this step size will adjust dynamically while tuning<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> private float step = DEFAULT_MAX_STEP_VALUE;<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> private StepDirection prevTuneDirection = StepDirection.NEUTRAL;<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> //positive means memstore's size was increased<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> //It is not just arithmetic sum of past tuner periods. More priority is given to recent<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> //tuning steps.<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> private double decayingTunerStepSizeSum = 0;<a name="line.126"></a> |
| <span class="sourceLineNo">127</span><a name="line.127"></a> |
| <span class="sourceLineNo">128</span> @Override<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> public TunerResult tune(TunerContext context) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> float curMemstoreSize = context.getCurMemStoreSize();<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> float curBlockCacheSize = context.getCurBlockCacheSize();<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> addToRollingStats(context);<a name="line.132"></a> |
| <span class="sourceLineNo">133</span><a name="line.133"></a> |
| <span class="sourceLineNo">134</span> if (ignoreInitialPeriods < numPeriodsToIgnore) {<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> // Ignoring the first few tuner periods<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> ignoreInitialPeriods++;<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> rollingStatsForTunerSteps.insertDataValue(0);<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> return NO_OP_TUNER_RESULT;<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> }<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> StepDirection newTuneDirection = getTuneDirection(context);<a name="line.140"></a> |
| <span class="sourceLineNo">141</span><a name="line.141"></a> |
| <span class="sourceLineNo">142</span> long blockedFlushCount = context.getBlockedFlushCount();<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> long unblockedFlushCount = context.getUnblockedFlushCount();<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> long totalOnheapFlushCount = blockedFlushCount + unblockedFlushCount;<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> boolean offheapMemstore = context.isOffheapMemStore();<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> float newMemstoreSize;<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> float newBlockCacheSize;<a name="line.147"></a> |
| <span class="sourceLineNo">148</span><a name="line.148"></a> |
| <span class="sourceLineNo">149</span> // Adjusting step size for tuning to get to steady state or restart from steady state.<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> // Even if the step size was 4% and 32 GB memory size, we will be shifting 1 GB back and forth<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> // per tuner operation and it can affect the performance of cluster so we keep on decreasing<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> // step size until everything settles.<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> if (prevTuneDirection == StepDirection.NEUTRAL<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> && newTuneDirection != StepDirection.NEUTRAL<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> && rollingStatsForTunerSteps.getDeviation() < TUNER_STEP_EPS) {<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> // Restarting the tuning from steady state and setting step size to maximum.<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> // The deviation cannot be that low if last period was neutral and some recent periods were<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> // not neutral.<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> step = maximumStepSize;<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> } else if ((newTuneDirection == StepDirection.INCREASE_MEMSTORE_SIZE<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> && decayingTunerStepSizeSum < 0) ||<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> (newTuneDirection == StepDirection.INCREASE_BLOCK_CACHE_SIZE<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> && decayingTunerStepSizeSum > 0)) {<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> // Current step is opposite of past tuner actions so decrease the step size to reach steady<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> // state.<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> if (!offheapMemstore && step != minimumStepSize) {<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> // we leave the step to be at minimumStepSize for offheap memstore<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> step = step / 2.00f;<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> }<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> }<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> if (step < minimumStepSize) {<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> // If step size is too small then we do nothing.<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> LOG.debug("Tuner step size is too low; we will not perform any tuning this time.");<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> step = 0.0f;<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> newTuneDirection = StepDirection.NEUTRAL;<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> }<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> // There are no flushes due to onheap pressure and<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> // we have an offheap memstore and we are in need of more block_cache size.<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> if (totalOnheapFlushCount == 0 && offheapMemstore<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> && newTuneDirection == StepDirection.INCREASE_BLOCK_CACHE_SIZE) {<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> // we are sure that there are flushes only due to offheap pressure<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> // So don't do the memstore decrease equal to the step size. Instead do minimum stepSize<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> // decrease. But even if we have some flushes due to heap then it is better we tune<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> // the existing way.<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> step = minimumStepSize;<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> }<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> // Increase / decrease the memstore / block cache sizes depending on new tuner step.<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> // We don't want to exert immediate pressure on memstore. So, we decrease its size gracefully;<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> // we set a minimum bar in the middle of the total memstore size and the lower limit.<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> float minMemstoreSize = ((globalMemStoreLimitLowMarkPercent + 1) * curMemstoreSize) / 2.00f;<a name="line.190"></a> |
| <span class="sourceLineNo">191</span><a name="line.191"></a> |
| <span class="sourceLineNo">192</span> switch (newTuneDirection) {<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> case INCREASE_BLOCK_CACHE_SIZE:<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> if (curMemstoreSize - step < minMemstoreSize) {<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> step = curMemstoreSize - minMemstoreSize;<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> }<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> newMemstoreSize = curMemstoreSize - step;<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> newBlockCacheSize = curBlockCacheSize + step;<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> rollingStatsForTunerSteps.insertDataValue(-(int)(step*100000));<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> decayingTunerStepSizeSum = (decayingTunerStepSizeSum - step)/2.00f;<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> break;<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> case INCREASE_MEMSTORE_SIZE:<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> newBlockCacheSize = curBlockCacheSize - step;<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> newMemstoreSize = curMemstoreSize + step;<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> rollingStatsForTunerSteps.insertDataValue((int)(step*100000));<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> decayingTunerStepSizeSum = (decayingTunerStepSizeSum + step)/2.00f;<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> break;<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> default:<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> prevTuneDirection = StepDirection.NEUTRAL;<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> rollingStatsForTunerSteps.insertDataValue(0);<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> decayingTunerStepSizeSum = (decayingTunerStepSizeSum)/2.00f;<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> return NO_OP_TUNER_RESULT;<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> }<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> // Check we are within max/min bounds.<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> if (newMemstoreSize > globalMemStorePercentMaxRange) {<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> newMemstoreSize = globalMemStorePercentMaxRange;<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> } else if (newMemstoreSize < globalMemStorePercentMinRange) {<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> newMemstoreSize = globalMemStorePercentMinRange;<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> }<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> if (newBlockCacheSize > blockCachePercentMaxRange) {<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> newBlockCacheSize = blockCachePercentMaxRange;<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> } else if (newBlockCacheSize < blockCachePercentMinRange) {<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> newBlockCacheSize = blockCachePercentMinRange;<a name="line.223"></a> |
| <span class="sourceLineNo">224</span> }<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> TUNER_RESULT.setBlockCacheSize(newBlockCacheSize);<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> TUNER_RESULT.setMemStoreSize(newMemstoreSize);<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> prevTuneDirection = newTuneDirection;<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> return TUNER_RESULT;<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> }<a name="line.229"></a> |
| <span class="sourceLineNo">230</span><a name="line.230"></a> |
| <span class="sourceLineNo">231</span> /**<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> * Determine best direction of tuning base on given context.<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> * @param context The tuner context.<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> * @return tuning direction.<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> */<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> private StepDirection getTuneDirection(TunerContext context) {<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> StepDirection newTuneDirection = StepDirection.NEUTRAL;<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> long blockedFlushCount = context.getBlockedFlushCount();<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> long unblockedFlushCount = context.getUnblockedFlushCount();<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> long evictCount = context.getEvictCount();<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> long cacheMissCount = context.getCacheMissCount();<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> long totalFlushCount = blockedFlushCount + unblockedFlushCount;<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> float curMemstoreSize = context.getCurMemStoreSize();<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> float curBlockCacheSize = context.getCurBlockCacheSize();<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> StringBuilder tunerLog = new StringBuilder();<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> // We can consider memstore or block cache to be sufficient if<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> // we are using only a minor fraction of what have been already provided to it.<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> boolean earlyMemstoreSufficientCheck = totalFlushCount == 0<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> || context.getCurMemStoreUsed() < curMemstoreSize * sufficientMemoryLevel;<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> boolean earlyBlockCacheSufficientCheck = evictCount == 0 ||<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> context.getCurBlockCacheUsed() < curBlockCacheSize * sufficientMemoryLevel;<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> if (earlyMemstoreSufficientCheck && earlyBlockCacheSufficientCheck) {<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> // Both memstore and block cache memory seems to be sufficient. No operation required.<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> newTuneDirection = StepDirection.NEUTRAL;<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> } else if (earlyMemstoreSufficientCheck) {<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> // Increase the block cache size and corresponding decrease in memstore size.<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> newTuneDirection = StepDirection.INCREASE_BLOCK_CACHE_SIZE;<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> } else if (earlyBlockCacheSufficientCheck) {<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> // Increase the memstore size and corresponding decrease in block cache size.<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> newTuneDirection = StepDirection.INCREASE_MEMSTORE_SIZE;<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> } else {<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> // Early checks for sufficient memory failed. Tuning memory based on past statistics.<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> // Boolean indicator to show if we need to revert previous step or not.<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> boolean isReverting = false;<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> switch (prevTuneDirection) {<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> // Here we are using number of evictions rather than cache misses because it is more<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> // strong indicator for deficient cache size. Improving caching is what we<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> // would like to optimize for in steady state.<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> case INCREASE_BLOCK_CACHE_SIZE:<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> if ((double)evictCount > rollingStatsForEvictions.getMean() ||<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> (double)totalFlushCount > rollingStatsForFlushes.getMean() +<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> rollingStatsForFlushes.getDeviation()/2.00) {<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> // Reverting previous step as it was not useful.<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> // Tuning failed to decrease evictions or tuning resulted in large number of flushes.<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> newTuneDirection = StepDirection.INCREASE_MEMSTORE_SIZE;<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> tunerLog.append("We will revert previous tuning");<a name="line.276"></a> |
| <span class="sourceLineNo">277</span> if ((double)evictCount > rollingStatsForEvictions.getMean()) {<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> tunerLog.append(" because we could not decrease evictions sufficiently.");<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> } else {<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> tunerLog.append(" because the number of flushes rose significantly.");<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> }<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> isReverting = true;<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> }<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> break;<a name="line.284"></a> |
| <span class="sourceLineNo">285</span> case INCREASE_MEMSTORE_SIZE:<a name="line.285"></a> |
| <span class="sourceLineNo">286</span> if ((double)totalFlushCount > rollingStatsForFlushes.getMean() ||<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> (double)evictCount > rollingStatsForEvictions.getMean() +<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> rollingStatsForEvictions.getDeviation()/2.00) {<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> // Reverting previous step as it was not useful.<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> // Tuning failed to decrease flushes or tuning resulted in large number of evictions.<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> newTuneDirection = StepDirection.INCREASE_BLOCK_CACHE_SIZE;<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> tunerLog.append("We will revert previous tuning");<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> if ((double)totalFlushCount > rollingStatsForFlushes.getMean()) {<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> tunerLog.append(" because we could not decrease flushes sufficiently.");<a name="line.294"></a> |
| <span class="sourceLineNo">295</span> } else {<a name="line.295"></a> |
| <span class="sourceLineNo">296</span> tunerLog.append(" because number of evictions rose significantly.");<a name="line.296"></a> |
| <span class="sourceLineNo">297</span> }<a name="line.297"></a> |
| <span class="sourceLineNo">298</span> isReverting = true;<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> }<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> break;<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> default:<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> // Last step was neutral, revert doesn't not apply here.<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> break;<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> }<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> // If we are not reverting. We try to tune memory sizes by looking at cache misses / flushes.<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> if (!isReverting){<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> // mean +- deviation*0.8 is considered to be normal<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> // below it its consider low and above it is considered high.<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> // We can safely assume that the number cache misses, flushes are normally distributed over<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> // past periods and hence on all the above mentioned classes (normal, high and low)<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> // are likely to occur with probability 56%, 22%, 22% respectively. Hence there is at<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> // least ~10% probability that we will not fall in NEUTRAL step.<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> // This optimization solution is feedback based and we revert when we<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> // dont find our steps helpful. Hence we want to do tuning only when we have clear<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> // indications because too many unnecessary tuning may affect the performance of cluster.<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> if ((double)cacheMissCount < rollingStatsForCacheMisses.getMean() -<a name="line.316"></a> |
| <span class="sourceLineNo">317</span> rollingStatsForCacheMisses.getDeviation()*0.80 &&<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> (double)totalFlushCount < rollingStatsForFlushes.getMean() -<a name="line.318"></a> |
| <span class="sourceLineNo">319</span> rollingStatsForFlushes.getDeviation()*0.80) {<a name="line.319"></a> |
| <span class="sourceLineNo">320</span> // Everything is fine no tuning required<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> newTuneDirection = StepDirection.NEUTRAL;<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> } else if ((double)cacheMissCount > rollingStatsForCacheMisses.getMean() +<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> rollingStatsForCacheMisses.getDeviation()*0.80 &&<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> (double)totalFlushCount < rollingStatsForFlushes.getMean() -<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> rollingStatsForFlushes.getDeviation()*0.80) {<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> // more misses , increasing cache size<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> newTuneDirection = StepDirection.INCREASE_BLOCK_CACHE_SIZE;<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> tunerLog.append(<a name="line.328"></a> |
| <span class="sourceLineNo">329</span> "Going to increase block cache size due to increase in number of cache misses.");<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> } else if ((double)cacheMissCount < rollingStatsForCacheMisses.getMean() -<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> rollingStatsForCacheMisses.getDeviation()*0.80 &&<a name="line.331"></a> |
| <span class="sourceLineNo">332</span> (double)totalFlushCount > rollingStatsForFlushes.getMean() +<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> rollingStatsForFlushes.getDeviation()*0.80) {<a name="line.333"></a> |
| <span class="sourceLineNo">334</span> // more flushes , increasing memstore size<a name="line.334"></a> |
| <span class="sourceLineNo">335</span> newTuneDirection = StepDirection.INCREASE_MEMSTORE_SIZE;<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> tunerLog.append("Going to increase memstore size due to increase in number of flushes.");<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> } else if (blockedFlushCount > 0 && prevTuneDirection == StepDirection.NEUTRAL) {<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> // we do not want blocked flushes<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> newTuneDirection = StepDirection.INCREASE_MEMSTORE_SIZE;<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> tunerLog.append("Going to increase memstore size due to"<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> + blockedFlushCount + " blocked flushes.");<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> } else {<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> // Default. Not enough facts to do tuning.<a name="line.343"></a> |
| <span class="sourceLineNo">344</span> tunerLog.append("Going to do nothing because we "<a name="line.344"></a> |
| <span class="sourceLineNo">345</span> + "could not determine best tuning direction");<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> newTuneDirection = StepDirection.NEUTRAL;<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> }<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> }<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> }<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> if (LOG.isDebugEnabled()) {<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> LOG.debug(tunerLog.toString());<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> }<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> return newTuneDirection;<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> }<a name="line.354"></a> |
| <span class="sourceLineNo">355</span><a name="line.355"></a> |
| <span class="sourceLineNo">356</span> /**<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> * Add the given context to the rolling tuner stats.<a name="line.357"></a> |
| <span class="sourceLineNo">358</span> * @param context The tuner context.<a name="line.358"></a> |
| <span class="sourceLineNo">359</span> */<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> private void addToRollingStats(TunerContext context) {<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> rollingStatsForCacheMisses.insertDataValue(context.getCacheMissCount());<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> rollingStatsForFlushes<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> .insertDataValue(context.getBlockedFlushCount() + context.getUnblockedFlushCount());<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> rollingStatsForEvictions.insertDataValue(context.getEvictCount());<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> @Override<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> public Configuration getConf() {<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> return this.conf;<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> }<a name="line.370"></a> |
| <span class="sourceLineNo">371</span><a name="line.371"></a> |
| <span class="sourceLineNo">372</span> @Override<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> public void setConf(Configuration conf) {<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> this.conf = conf;<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> this.maximumStepSize = conf.getFloat(MAX_STEP_KEY, DEFAULT_MAX_STEP_VALUE);<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> this.minimumStepSize = conf.getFloat(MIN_STEP_KEY, DEFAULT_MIN_STEP_VALUE);<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> this.step = this.maximumStepSize;<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> this.sufficientMemoryLevel = conf.getFloat(SUFFICIENT_MEMORY_LEVEL_KEY,<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> DEFAULT_SUFFICIENT_MEMORY_LEVEL_VALUE);<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> this.tunerLookupPeriods = conf.getInt(LOOKUP_PERIODS_KEY, DEFAULT_LOOKUP_PERIODS);<a name="line.380"></a> |
| <span class="sourceLineNo">381</span> this.blockCachePercentMinRange = conf.getFloat(BLOCK_CACHE_SIZE_MIN_RANGE_KEY,<a name="line.381"></a> |
| <span class="sourceLineNo">382</span> conf.getFloat(HFILE_BLOCK_CACHE_SIZE_KEY, HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT));<a name="line.382"></a> |
| <span class="sourceLineNo">383</span> this.blockCachePercentMaxRange = conf.getFloat(BLOCK_CACHE_SIZE_MAX_RANGE_KEY,<a name="line.383"></a> |
| <span class="sourceLineNo">384</span> conf.getFloat(HFILE_BLOCK_CACHE_SIZE_KEY, HConstants.HFILE_BLOCK_CACHE_SIZE_DEFAULT));<a name="line.384"></a> |
| <span class="sourceLineNo">385</span> this.globalMemStorePercentMinRange = conf.getFloat(MEMSTORE_SIZE_MIN_RANGE_KEY,<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> MemorySizeUtil.getGlobalMemStoreHeapPercent(conf, false));<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> this.globalMemStorePercentMaxRange = conf.getFloat(MEMSTORE_SIZE_MAX_RANGE_KEY,<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> MemorySizeUtil.getGlobalMemStoreHeapPercent(conf, false));<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> this.globalMemStoreLimitLowMarkPercent = MemorySizeUtil.getGlobalMemStoreHeapLowerMark(conf,<a name="line.389"></a> |
| <span class="sourceLineNo">390</span> true);<a name="line.390"></a> |
| <span class="sourceLineNo">391</span> // Default value of periods to ignore is number of lookup periods<a name="line.391"></a> |
| <span class="sourceLineNo">392</span> this.numPeriodsToIgnore = conf.getInt(NUM_PERIODS_TO_IGNORE, this.tunerLookupPeriods);<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> this.rollingStatsForCacheMisses = new RollingStatCalculator(this.tunerLookupPeriods);<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> this.rollingStatsForFlushes = new RollingStatCalculator(this.tunerLookupPeriods);<a name="line.394"></a> |
| <span class="sourceLineNo">395</span> this.rollingStatsForEvictions = new RollingStatCalculator(this.tunerLookupPeriods);<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> this.rollingStatsForTunerSteps = new RollingStatCalculator(this.tunerLookupPeriods);<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> }<a name="line.397"></a> |
| <span class="sourceLineNo">398</span><a name="line.398"></a> |
| <span class="sourceLineNo">399</span> private enum StepDirection{<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> // block cache size was increased<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> INCREASE_BLOCK_CACHE_SIZE,<a name="line.401"></a> |
| <span class="sourceLineNo">402</span> // memstore size was increased<a name="line.402"></a> |
| <span class="sourceLineNo">403</span> INCREASE_MEMSTORE_SIZE,<a name="line.403"></a> |
| <span class="sourceLineNo">404</span> // no operation was performed<a name="line.404"></a> |
| <span class="sourceLineNo">405</span> NEUTRAL<a name="line.405"></a> |
| <span class="sourceLineNo">406</span> }<a name="line.406"></a> |
| <span class="sourceLineNo">407</span>}<a name="line.407"></a> |
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