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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 com.google.errorprone.annotations.RestrictedApi;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.ArrayList;<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.HashMap;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.List;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.Map;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.concurrent.Callable;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.concurrent.ExecutionException;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.concurrent.Executors;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.concurrent.TimeUnit;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import org.apache.hadoop.conf.Configured;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.ClusterMetrics;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.HDFSBlocksDistribution;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.ServerName;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.TableName;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.client.RegionInfo;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.client.TableDescriptor;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import org.slf4j.Logger;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.slf4j.LoggerFactory;<a name="line.42"></a>
<span class="sourceLineNo">043</span><a name="line.43"></a>
<span class="sourceLineNo">044</span>import org.apache.hbase.thirdparty.com.google.common.cache.CacheBuilder;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import org.apache.hbase.thirdparty.com.google.common.cache.CacheLoader;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import org.apache.hbase.thirdparty.com.google.common.cache.LoadingCache;<a name="line.46"></a>
<span class="sourceLineNo">047</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.Futures;<a name="line.47"></a>
<span class="sourceLineNo">048</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ListenableFuture;<a name="line.48"></a>
<span class="sourceLineNo">049</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ListeningExecutorService;<a name="line.49"></a>
<span class="sourceLineNo">050</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.MoreExecutors;<a name="line.50"></a>
<span class="sourceLineNo">051</span>import org.apache.hbase.thirdparty.com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>/**<a name="line.53"></a>
<span class="sourceLineNo">054</span> * This will find where data for a region is located in HDFS. It ranks {@link ServerName}'s by the<a name="line.54"></a>
<span class="sourceLineNo">055</span> * size of the store files they are holding for a given region.<a name="line.55"></a>
<span class="sourceLineNo">056</span> */<a name="line.56"></a>
<span class="sourceLineNo">057</span>@InterfaceAudience.Private<a name="line.57"></a>
<span class="sourceLineNo">058</span>class RegionHDFSBlockLocationFinder extends Configured {<a name="line.58"></a>
<span class="sourceLineNo">059</span> private static final Logger LOG = LoggerFactory.getLogger(RegionHDFSBlockLocationFinder.class);<a name="line.59"></a>
<span class="sourceLineNo">060</span> private static final long CACHE_TIME = 240 * 60 * 1000;<a name="line.60"></a>
<span class="sourceLineNo">061</span> private static final HDFSBlocksDistribution EMPTY_BLOCK_DISTRIBUTION =<a name="line.61"></a>
<span class="sourceLineNo">062</span> new HDFSBlocksDistribution();<a name="line.62"></a>
<span class="sourceLineNo">063</span> private volatile ClusterMetrics status;<a name="line.63"></a>
<span class="sourceLineNo">064</span> private volatile ClusterInfoProvider provider;<a name="line.64"></a>
<span class="sourceLineNo">065</span> private final ListeningExecutorService executor;<a name="line.65"></a>
<span class="sourceLineNo">066</span> // Do not scheduleFullRefresh at master startup<a name="line.66"></a>
<span class="sourceLineNo">067</span> private long lastFullRefresh = EnvironmentEdgeManager.currentTime();<a name="line.67"></a>
<span class="sourceLineNo">068</span><a name="line.68"></a>
<span class="sourceLineNo">069</span> private CacheLoader&lt;RegionInfo, HDFSBlocksDistribution&gt; loader =<a name="line.69"></a>
<span class="sourceLineNo">070</span> new CacheLoader&lt;RegionInfo, HDFSBlocksDistribution&gt;() {<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span> @Override<a name="line.72"></a>
<span class="sourceLineNo">073</span> public ListenableFuture&lt;HDFSBlocksDistribution&gt; reload(final RegionInfo hri,<a name="line.73"></a>
<span class="sourceLineNo">074</span> HDFSBlocksDistribution oldValue) throws Exception {<a name="line.74"></a>
<span class="sourceLineNo">075</span> return executor.submit(new Callable&lt;HDFSBlocksDistribution&gt;() {<a name="line.75"></a>
<span class="sourceLineNo">076</span> @Override<a name="line.76"></a>
<span class="sourceLineNo">077</span> public HDFSBlocksDistribution call() throws Exception {<a name="line.77"></a>
<span class="sourceLineNo">078</span> return internalGetTopBlockLocation(hri);<a name="line.78"></a>
<span class="sourceLineNo">079</span> }<a name="line.79"></a>
<span class="sourceLineNo">080</span> });<a name="line.80"></a>
<span class="sourceLineNo">081</span> }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span> @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span> public HDFSBlocksDistribution load(RegionInfo key) throws Exception {<a name="line.84"></a>
<span class="sourceLineNo">085</span> return internalGetTopBlockLocation(key);<a name="line.85"></a>
<span class="sourceLineNo">086</span> }<a name="line.86"></a>
<span class="sourceLineNo">087</span> };<a name="line.87"></a>
<span class="sourceLineNo">088</span><a name="line.88"></a>
<span class="sourceLineNo">089</span> // The cache for where regions are located.<a name="line.89"></a>
<span class="sourceLineNo">090</span> private LoadingCache&lt;RegionInfo, HDFSBlocksDistribution&gt; cache = null;<a name="line.90"></a>
<span class="sourceLineNo">091</span><a name="line.91"></a>
<span class="sourceLineNo">092</span> RegionHDFSBlockLocationFinder() {<a name="line.92"></a>
<span class="sourceLineNo">093</span> this.cache = createCache();<a name="line.93"></a>
<span class="sourceLineNo">094</span> executor = MoreExecutors.listeningDecorator(Executors.newScheduledThreadPool(5,<a name="line.94"></a>
<span class="sourceLineNo">095</span> new ThreadFactoryBuilder().setDaemon(true).setNameFormat("region-location-%d").build()));<a name="line.95"></a>
<span class="sourceLineNo">096</span> }<a name="line.96"></a>
<span class="sourceLineNo">097</span><a name="line.97"></a>
<span class="sourceLineNo">098</span> /**<a name="line.98"></a>
<span class="sourceLineNo">099</span> * Create a cache for region to list of servers<a name="line.99"></a>
<span class="sourceLineNo">100</span> * @return A new Cache.<a name="line.100"></a>
<span class="sourceLineNo">101</span> */<a name="line.101"></a>
<span class="sourceLineNo">102</span> private LoadingCache&lt;RegionInfo, HDFSBlocksDistribution&gt; createCache() {<a name="line.102"></a>
<span class="sourceLineNo">103</span> return CacheBuilder.newBuilder().expireAfterWrite(CACHE_TIME, TimeUnit.MILLISECONDS)<a name="line.103"></a>
<span class="sourceLineNo">104</span> .build(loader);<a name="line.104"></a>
<span class="sourceLineNo">105</span> }<a name="line.105"></a>
<span class="sourceLineNo">106</span><a name="line.106"></a>
<span class="sourceLineNo">107</span> void setClusterInfoProvider(ClusterInfoProvider provider) {<a name="line.107"></a>
<span class="sourceLineNo">108</span> this.provider = provider;<a name="line.108"></a>
<span class="sourceLineNo">109</span> }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span> void setClusterMetrics(ClusterMetrics status) {<a name="line.111"></a>
<span class="sourceLineNo">112</span> long currentTime = EnvironmentEdgeManager.currentTime();<a name="line.112"></a>
<span class="sourceLineNo">113</span> this.status = status;<a name="line.113"></a>
<span class="sourceLineNo">114</span> if (currentTime &gt; lastFullRefresh + (CACHE_TIME / 2)) {<a name="line.114"></a>
<span class="sourceLineNo">115</span> // Only count the refresh if it includes user tables ( eg more than meta and namespace ).<a name="line.115"></a>
<span class="sourceLineNo">116</span> lastFullRefresh = scheduleFullRefresh() ? currentTime : lastFullRefresh;<a name="line.116"></a>
<span class="sourceLineNo">117</span> }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span> }<a name="line.119"></a>
<span class="sourceLineNo">120</span><a name="line.120"></a>
<span class="sourceLineNo">121</span> /**<a name="line.121"></a>
<span class="sourceLineNo">122</span> * Refresh all the region locations.<a name="line.122"></a>
<span class="sourceLineNo">123</span> * @return true if user created regions got refreshed.<a name="line.123"></a>
<span class="sourceLineNo">124</span> */<a name="line.124"></a>
<span class="sourceLineNo">125</span> private boolean scheduleFullRefresh() {<a name="line.125"></a>
<span class="sourceLineNo">126</span> ClusterInfoProvider service = this.provider;<a name="line.126"></a>
<span class="sourceLineNo">127</span> // Protect from anything being null while starting up.<a name="line.127"></a>
<span class="sourceLineNo">128</span> if (service == null) {<a name="line.128"></a>
<span class="sourceLineNo">129</span> return false;<a name="line.129"></a>
<span class="sourceLineNo">130</span> }<a name="line.130"></a>
<span class="sourceLineNo">131</span><a name="line.131"></a>
<span class="sourceLineNo">132</span> // TODO: Should this refresh all the regions or only the ones assigned?<a name="line.132"></a>
<span class="sourceLineNo">133</span> boolean includesUserTables = false;<a name="line.133"></a>
<span class="sourceLineNo">134</span> for (final RegionInfo hri : service.getAssignedRegions()) {<a name="line.134"></a>
<span class="sourceLineNo">135</span> cache.refresh(hri);<a name="line.135"></a>
<span class="sourceLineNo">136</span> includesUserTables |= !hri.getTable().isSystemTable();<a name="line.136"></a>
<span class="sourceLineNo">137</span> }<a name="line.137"></a>
<span class="sourceLineNo">138</span> return includesUserTables;<a name="line.138"></a>
<span class="sourceLineNo">139</span> }<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span> List&lt;ServerName&gt; getTopBlockLocations(RegionInfo region) {<a name="line.141"></a>
<span class="sourceLineNo">142</span> List&lt;String&gt; topHosts = getBlockDistribution(region).getTopHosts();<a name="line.142"></a>
<span class="sourceLineNo">143</span> return mapHostNameToServerName(topHosts);<a name="line.143"></a>
<span class="sourceLineNo">144</span> }<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span> /**<a name="line.146"></a>
<span class="sourceLineNo">147</span> * Returns an ordered list of hosts that are hosting the blocks for this region. The weight of<a name="line.147"></a>
<span class="sourceLineNo">148</span> * each host is the sum of the block lengths of all files on that host, so the first host in the<a name="line.148"></a>
<span class="sourceLineNo">149</span> * list is the server which holds the most bytes of the given region's HFiles.<a name="line.149"></a>
<span class="sourceLineNo">150</span> * @param region region<a name="line.150"></a>
<span class="sourceLineNo">151</span> * @return ordered list of hosts holding blocks of the specified region<a name="line.151"></a>
<span class="sourceLineNo">152</span> */<a name="line.152"></a>
<span class="sourceLineNo">153</span> private HDFSBlocksDistribution internalGetTopBlockLocation(RegionInfo region) {<a name="line.153"></a>
<span class="sourceLineNo">154</span> try {<a name="line.154"></a>
<span class="sourceLineNo">155</span> TableDescriptor tableDescriptor = getDescriptor(region.getTable());<a name="line.155"></a>
<span class="sourceLineNo">156</span> if (tableDescriptor != null) {<a name="line.156"></a>
<span class="sourceLineNo">157</span> HDFSBlocksDistribution blocksDistribution =<a name="line.157"></a>
<span class="sourceLineNo">158</span> provider.computeHDFSBlocksDistribution(getConf(), tableDescriptor, region);<a name="line.158"></a>
<span class="sourceLineNo">159</span> return blocksDistribution;<a name="line.159"></a>
<span class="sourceLineNo">160</span> }<a name="line.160"></a>
<span class="sourceLineNo">161</span> } catch (IOException ioe) {<a name="line.161"></a>
<span class="sourceLineNo">162</span> LOG.warn("IOException during HDFSBlocksDistribution computation. for " + "region = " +<a name="line.162"></a>
<span class="sourceLineNo">163</span> region.getEncodedName(), ioe);<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> return EMPTY_BLOCK_DISTRIBUTION;<a name="line.166"></a>
<span class="sourceLineNo">167</span> }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span> /**<a name="line.169"></a>
<span class="sourceLineNo">170</span> * return TableDescriptor for a given tableName<a name="line.170"></a>
<span class="sourceLineNo">171</span> * @param tableName the table name<a name="line.171"></a>
<span class="sourceLineNo">172</span> */<a name="line.172"></a>
<span class="sourceLineNo">173</span> private TableDescriptor getDescriptor(TableName tableName) throws IOException {<a name="line.173"></a>
<span class="sourceLineNo">174</span> ClusterInfoProvider service = this.provider;<a name="line.174"></a>
<span class="sourceLineNo">175</span> if (service == null) {<a name="line.175"></a>
<span class="sourceLineNo">176</span> return null;<a name="line.176"></a>
<span class="sourceLineNo">177</span> }<a name="line.177"></a>
<span class="sourceLineNo">178</span> return service.getTableDescriptor(tableName);<a name="line.178"></a>
<span class="sourceLineNo">179</span> }<a name="line.179"></a>
<span class="sourceLineNo">180</span><a name="line.180"></a>
<span class="sourceLineNo">181</span> /**<a name="line.181"></a>
<span class="sourceLineNo">182</span> * Map hostname to ServerName, The output ServerName list will have the same order as input hosts.<a name="line.182"></a>
<span class="sourceLineNo">183</span> * @param hosts the list of hosts<a name="line.183"></a>
<span class="sourceLineNo">184</span> * @return ServerName list<a name="line.184"></a>
<span class="sourceLineNo">185</span> */<a name="line.185"></a>
<span class="sourceLineNo">186</span> @RestrictedApi(explanation = "Should only be called in tests", link = "",<a name="line.186"></a>
<span class="sourceLineNo">187</span> allowedOnPath = ".*/src/test/.*|.*/RegionHDFSBlockLocationFinder.java")<a name="line.187"></a>
<span class="sourceLineNo">188</span> List&lt;ServerName&gt; mapHostNameToServerName(List&lt;String&gt; hosts) {<a name="line.188"></a>
<span class="sourceLineNo">189</span> if (hosts == null || status == null) {<a name="line.189"></a>
<span class="sourceLineNo">190</span> if (hosts == null) {<a name="line.190"></a>
<span class="sourceLineNo">191</span> LOG.warn("RegionLocationFinder top hosts is null");<a name="line.191"></a>
<span class="sourceLineNo">192</span> }<a name="line.192"></a>
<span class="sourceLineNo">193</span> return Collections.emptyList();<a name="line.193"></a>
<span class="sourceLineNo">194</span> }<a name="line.194"></a>
<span class="sourceLineNo">195</span><a name="line.195"></a>
<span class="sourceLineNo">196</span> List&lt;ServerName&gt; topServerNames = new ArrayList&lt;&gt;();<a name="line.196"></a>
<span class="sourceLineNo">197</span> Collection&lt;ServerName&gt; regionServers = status.getLiveServerMetrics().keySet();<a name="line.197"></a>
<span class="sourceLineNo">198</span><a name="line.198"></a>
<span class="sourceLineNo">199</span> // create a mapping from hostname to ServerName for fast lookup<a name="line.199"></a>
<span class="sourceLineNo">200</span> Map&lt;String, List&lt;ServerName&gt;&gt; hostToServerName = new HashMap&lt;&gt;();<a name="line.200"></a>
<span class="sourceLineNo">201</span> for (ServerName sn : regionServers) {<a name="line.201"></a>
<span class="sourceLineNo">202</span> String host = sn.getHostname();<a name="line.202"></a>
<span class="sourceLineNo">203</span> if (!hostToServerName.containsKey(host)) {<a name="line.203"></a>
<span class="sourceLineNo">204</span> hostToServerName.put(host, new ArrayList&lt;&gt;());<a name="line.204"></a>
<span class="sourceLineNo">205</span> }<a name="line.205"></a>
<span class="sourceLineNo">206</span> hostToServerName.get(host).add(sn);<a name="line.206"></a>
<span class="sourceLineNo">207</span> }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span> for (String host : hosts) {<a name="line.209"></a>
<span class="sourceLineNo">210</span> if (!hostToServerName.containsKey(host)) {<a name="line.210"></a>
<span class="sourceLineNo">211</span> continue;<a name="line.211"></a>
<span class="sourceLineNo">212</span> }<a name="line.212"></a>
<span class="sourceLineNo">213</span> for (ServerName sn : hostToServerName.get(host)) {<a name="line.213"></a>
<span class="sourceLineNo">214</span> // it is possible that HDFS is up ( thus host is valid ),<a name="line.214"></a>
<span class="sourceLineNo">215</span> // but RS is down ( thus sn is null )<a name="line.215"></a>
<span class="sourceLineNo">216</span> if (sn != null) {<a name="line.216"></a>
<span class="sourceLineNo">217</span> topServerNames.add(sn);<a name="line.217"></a>
<span class="sourceLineNo">218</span> }<a name="line.218"></a>
<span class="sourceLineNo">219</span> }<a name="line.219"></a>
<span class="sourceLineNo">220</span> }<a name="line.220"></a>
<span class="sourceLineNo">221</span> return topServerNames;<a name="line.221"></a>
<span class="sourceLineNo">222</span> }<a name="line.222"></a>
<span class="sourceLineNo">223</span><a name="line.223"></a>
<span class="sourceLineNo">224</span> HDFSBlocksDistribution getBlockDistribution(RegionInfo hri) {<a name="line.224"></a>
<span class="sourceLineNo">225</span> HDFSBlocksDistribution blockDistbn = null;<a name="line.225"></a>
<span class="sourceLineNo">226</span> try {<a name="line.226"></a>
<span class="sourceLineNo">227</span> if (cache.asMap().containsKey(hri)) {<a name="line.227"></a>
<span class="sourceLineNo">228</span> blockDistbn = cache.get(hri);<a name="line.228"></a>
<span class="sourceLineNo">229</span> return blockDistbn;<a name="line.229"></a>
<span class="sourceLineNo">230</span> } else {<a name="line.230"></a>
<span class="sourceLineNo">231</span> LOG.trace("HDFSBlocksDistribution not found in cache for {}", hri.getRegionNameAsString());<a name="line.231"></a>
<span class="sourceLineNo">232</span> blockDistbn = internalGetTopBlockLocation(hri);<a name="line.232"></a>
<span class="sourceLineNo">233</span> cache.put(hri, blockDistbn);<a name="line.233"></a>
<span class="sourceLineNo">234</span> return blockDistbn;<a name="line.234"></a>
<span class="sourceLineNo">235</span> }<a name="line.235"></a>
<span class="sourceLineNo">236</span> } catch (ExecutionException e) {<a name="line.236"></a>
<span class="sourceLineNo">237</span> LOG.warn("Error while fetching cache entry ", e);<a name="line.237"></a>
<span class="sourceLineNo">238</span> blockDistbn = internalGetTopBlockLocation(hri);<a name="line.238"></a>
<span class="sourceLineNo">239</span> cache.put(hri, blockDistbn);<a name="line.239"></a>
<span class="sourceLineNo">240</span> return blockDistbn;<a name="line.240"></a>
<span class="sourceLineNo">241</span> }<a name="line.241"></a>
<span class="sourceLineNo">242</span> }<a name="line.242"></a>
<span class="sourceLineNo">243</span><a name="line.243"></a>
<span class="sourceLineNo">244</span> private ListenableFuture&lt;HDFSBlocksDistribution&gt; asyncGetBlockDistribution(RegionInfo hri) {<a name="line.244"></a>
<span class="sourceLineNo">245</span> try {<a name="line.245"></a>
<span class="sourceLineNo">246</span> return loader.reload(hri, EMPTY_BLOCK_DISTRIBUTION);<a name="line.246"></a>
<span class="sourceLineNo">247</span> } catch (Exception e) {<a name="line.247"></a>
<span class="sourceLineNo">248</span> return Futures.immediateFuture(EMPTY_BLOCK_DISTRIBUTION);<a name="line.248"></a>
<span class="sourceLineNo">249</span> }<a name="line.249"></a>
<span class="sourceLineNo">250</span> }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span> void refreshAndWait(Collection&lt;RegionInfo&gt; hris) {<a name="line.252"></a>
<span class="sourceLineNo">253</span> ArrayList&lt;ListenableFuture&lt;HDFSBlocksDistribution&gt;&gt; regionLocationFutures =<a name="line.253"></a>
<span class="sourceLineNo">254</span> new ArrayList&lt;&gt;(hris.size());<a name="line.254"></a>
<span class="sourceLineNo">255</span> for (RegionInfo hregionInfo : hris) {<a name="line.255"></a>
<span class="sourceLineNo">256</span> regionLocationFutures.add(asyncGetBlockDistribution(hregionInfo));<a name="line.256"></a>
<span class="sourceLineNo">257</span> }<a name="line.257"></a>
<span class="sourceLineNo">258</span> int index = 0;<a name="line.258"></a>
<span class="sourceLineNo">259</span> for (RegionInfo hregionInfo : hris) {<a name="line.259"></a>
<span class="sourceLineNo">260</span> ListenableFuture&lt;HDFSBlocksDistribution&gt; future = regionLocationFutures.get(index);<a name="line.260"></a>
<span class="sourceLineNo">261</span> try {<a name="line.261"></a>
<span class="sourceLineNo">262</span> cache.put(hregionInfo, future.get());<a name="line.262"></a>
<span class="sourceLineNo">263</span> } catch (InterruptedException ite) {<a name="line.263"></a>
<span class="sourceLineNo">264</span> Thread.currentThread().interrupt();<a name="line.264"></a>
<span class="sourceLineNo">265</span> } catch (ExecutionException ee) {<a name="line.265"></a>
<span class="sourceLineNo">266</span> LOG.debug("ExecutionException during HDFSBlocksDistribution computation. for region = " +<a name="line.266"></a>
<span class="sourceLineNo">267</span> hregionInfo.getEncodedName(), ee);<a name="line.267"></a>
<span class="sourceLineNo">268</span> }<a name="line.268"></a>
<span class="sourceLineNo">269</span> index++;<a name="line.269"></a>
<span class="sourceLineNo">270</span> }<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> @RestrictedApi(explanation = "Should only be called in tests", link = "",<a name="line.273"></a>
<span class="sourceLineNo">274</span> allowedOnPath = ".*/src/test/.*")<a name="line.274"></a>
<span class="sourceLineNo">275</span> LoadingCache&lt;RegionInfo, HDFSBlocksDistribution&gt; getCache() {<a name="line.275"></a>
<span class="sourceLineNo">276</span> return cache;<a name="line.276"></a>
<span class="sourceLineNo">277</span> }<a name="line.277"></a>
<span class="sourceLineNo">278</span>}<a name="line.278"></a>
</pre>
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