http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.StatisticsThread.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.StatisticsThread.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.StatisticsThread.html new file mode 100644 index 0000000..092287e --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.StatisticsThread.html @@ -0,0 +1,337 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html lang="en"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<div class="sourceContainer"> +<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> +<span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a> +<span class="sourceLineNo">003</span> *<a name="line.3"></a> +<span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a> +<span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a> +<span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a> +<span class="sourceLineNo">007</span> * licenses this file 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 with the License.<a name="line.8"></a> +<span class="sourceLineNo">009</span> * 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, WITHOUT<a name="line.14"></a> +<span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a> +<span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a> +<span class="sourceLineNo">017</span> * 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 java.util.concurrent.BlockingQueue;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import java.util.concurrent.Executors;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.util.concurrent.TimeUnit;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.26"></a> +<span class="sourceLineNo">027</span><a name="line.27"></a> +<span class="sourceLineNo">028</span>import org.apache.commons.logging.Log;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import org.apache.commons.logging.LogFactory;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.HeapMemoryTuneObserver;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.hadoop.util.StringUtils;<a name="line.32"></a> +<span class="sourceLineNo">033</span><a name="line.33"></a> +<span class="sourceLineNo">034</span>import com.google.common.annotations.VisibleForTesting;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import com.google.common.util.concurrent.ThreadFactoryBuilder;<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> * A pool of {@link Chunk} instances.<a name="line.38"></a> +<span class="sourceLineNo">039</span> * <a name="line.39"></a> +<span class="sourceLineNo">040</span> * MemStoreChunkPool caches a number of retired chunks for reusing, it could<a name="line.40"></a> +<span class="sourceLineNo">041</span> * decrease allocating bytes when writing, thereby optimizing the garbage<a name="line.41"></a> +<span class="sourceLineNo">042</span> * collection on JVM.<a name="line.42"></a> +<span class="sourceLineNo">043</span> * <a name="line.43"></a> +<span class="sourceLineNo">044</span> * The pool instance is globally unique and could be obtained through<a name="line.44"></a> +<span class="sourceLineNo">045</span> * {@link MemStoreChunkPool#initialize(long, float, float, int, boolean)}<a name="line.45"></a> +<span class="sourceLineNo">046</span> * <a name="line.46"></a> +<span class="sourceLineNo">047</span> * {@link MemStoreChunkPool#getChunk()} is called when MemStoreLAB allocating<a name="line.47"></a> +<span class="sourceLineNo">048</span> * bytes, and {@link MemStoreChunkPool#putbackChunks(BlockingQueue)} is called<a name="line.48"></a> +<span class="sourceLineNo">049</span> * when MemStore clearing snapshot for flush<a name="line.49"></a> +<span class="sourceLineNo">050</span> */<a name="line.50"></a> +<span class="sourceLineNo">051</span>@SuppressWarnings("javadoc")<a name="line.51"></a> +<span class="sourceLineNo">052</span>@InterfaceAudience.Private<a name="line.52"></a> +<span class="sourceLineNo">053</span>public class MemStoreChunkPool implements HeapMemoryTuneObserver {<a name="line.53"></a> +<span class="sourceLineNo">054</span> private static final Log LOG = LogFactory.getLog(MemStoreChunkPool.class);<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span> // Static reference to the MemStoreChunkPool<a name="line.56"></a> +<span class="sourceLineNo">057</span> static MemStoreChunkPool GLOBAL_INSTANCE;<a name="line.57"></a> +<span class="sourceLineNo">058</span> /** Boolean whether we have disabled the memstore chunk pool entirely. */<a name="line.58"></a> +<span class="sourceLineNo">059</span> static boolean chunkPoolDisabled = false;<a name="line.59"></a> +<span class="sourceLineNo">060</span><a name="line.60"></a> +<span class="sourceLineNo">061</span> private int maxCount;<a name="line.61"></a> +<span class="sourceLineNo">062</span><a name="line.62"></a> +<span class="sourceLineNo">063</span> // A queue of reclaimed chunks<a name="line.63"></a> +<span class="sourceLineNo">064</span> private final BlockingQueue<Chunk> reclaimedChunks;<a name="line.64"></a> +<span class="sourceLineNo">065</span> private final int chunkSize;<a name="line.65"></a> +<span class="sourceLineNo">066</span> private final float poolSizePercentage;<a name="line.66"></a> +<span class="sourceLineNo">067</span><a name="line.67"></a> +<span class="sourceLineNo">068</span> /** Statistics thread schedule pool */<a name="line.68"></a> +<span class="sourceLineNo">069</span> private final ScheduledExecutorService scheduleThreadPool;<a name="line.69"></a> +<span class="sourceLineNo">070</span> /** Statistics thread */<a name="line.70"></a> +<span class="sourceLineNo">071</span> private static final int statThreadPeriod = 60 * 5;<a name="line.71"></a> +<span class="sourceLineNo">072</span> private final AtomicLong chunkCount = new AtomicLong();<a name="line.72"></a> +<span class="sourceLineNo">073</span> private final AtomicLong reusedChunkCount = new AtomicLong();<a name="line.73"></a> +<span class="sourceLineNo">074</span> private final boolean offheap;<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> MemStoreChunkPool(int chunkSize, int maxCount, int initialCount, float poolSizePercentage,<a name="line.76"></a> +<span class="sourceLineNo">077</span> boolean offheap) {<a name="line.77"></a> +<span class="sourceLineNo">078</span> this.maxCount = maxCount;<a name="line.78"></a> +<span class="sourceLineNo">079</span> this.chunkSize = chunkSize;<a name="line.79"></a> +<span class="sourceLineNo">080</span> this.poolSizePercentage = poolSizePercentage;<a name="line.80"></a> +<span class="sourceLineNo">081</span> this.offheap = offheap;<a name="line.81"></a> +<span class="sourceLineNo">082</span> this.reclaimedChunks = new LinkedBlockingQueue<>();<a name="line.82"></a> +<span class="sourceLineNo">083</span> for (int i = 0; i < initialCount; i++) {<a name="line.83"></a> +<span class="sourceLineNo">084</span> Chunk chunk = this.offheap ? new OffheapChunk(chunkSize) : new OnheapChunk(chunkSize);<a name="line.84"></a> +<span class="sourceLineNo">085</span> chunk.init();<a name="line.85"></a> +<span class="sourceLineNo">086</span> reclaimedChunks.add(chunk);<a name="line.86"></a> +<span class="sourceLineNo">087</span> }<a name="line.87"></a> +<span class="sourceLineNo">088</span> chunkCount.set(initialCount);<a name="line.88"></a> +<span class="sourceLineNo">089</span> final String n = Thread.currentThread().getName();<a name="line.89"></a> +<span class="sourceLineNo">090</span> scheduleThreadPool = Executors.newScheduledThreadPool(1, new ThreadFactoryBuilder()<a name="line.90"></a> +<span class="sourceLineNo">091</span> .setNameFormat(n + "-MemStoreChunkPool Statistics").setDaemon(true).build());<a name="line.91"></a> +<span class="sourceLineNo">092</span> this.scheduleThreadPool.scheduleAtFixedRate(new StatisticsThread(), statThreadPeriod,<a name="line.92"></a> +<span class="sourceLineNo">093</span> statThreadPeriod, TimeUnit.SECONDS);<a name="line.93"></a> +<span class="sourceLineNo">094</span> }<a name="line.94"></a> +<span class="sourceLineNo">095</span><a name="line.95"></a> +<span class="sourceLineNo">096</span> /**<a name="line.96"></a> +<span class="sourceLineNo">097</span> * Poll a chunk from the pool, reset it if not null, else create a new chunk to return if we have<a name="line.97"></a> +<span class="sourceLineNo">098</span> * not yet created max allowed chunks count. When we have already created max allowed chunks and<a name="line.98"></a> +<span class="sourceLineNo">099</span> * no free chunks as of now, return null. It is the responsibility of the caller to make a chunk<a name="line.99"></a> +<span class="sourceLineNo">100</span> * then.<a name="line.100"></a> +<span class="sourceLineNo">101</span> * Note: Chunks returned by this pool must be put back to the pool after its use.<a name="line.101"></a> +<span class="sourceLineNo">102</span> * @return a chunk<a name="line.102"></a> +<span class="sourceLineNo">103</span> * @see #putbackChunk(Chunk)<a name="line.103"></a> +<span class="sourceLineNo">104</span> * @see #putbackChunks(BlockingQueue)<a name="line.104"></a> +<span class="sourceLineNo">105</span> */<a name="line.105"></a> +<span class="sourceLineNo">106</span> Chunk getChunk() {<a name="line.106"></a> +<span class="sourceLineNo">107</span> Chunk chunk = reclaimedChunks.poll();<a name="line.107"></a> +<span class="sourceLineNo">108</span> if (chunk != null) {<a name="line.108"></a> +<span class="sourceLineNo">109</span> chunk.reset();<a name="line.109"></a> +<span class="sourceLineNo">110</span> reusedChunkCount.incrementAndGet();<a name="line.110"></a> +<span class="sourceLineNo">111</span> } else {<a name="line.111"></a> +<span class="sourceLineNo">112</span> // Make a chunk iff we have not yet created the maxCount chunks<a name="line.112"></a> +<span class="sourceLineNo">113</span> while (true) {<a name="line.113"></a> +<span class="sourceLineNo">114</span> long created = this.chunkCount.get();<a name="line.114"></a> +<span class="sourceLineNo">115</span> if (created < this.maxCount) {<a name="line.115"></a> +<span class="sourceLineNo">116</span> chunk = this.offheap ? new OffheapChunk(this.chunkSize) : new OnheapChunk(this.chunkSize);<a name="line.116"></a> +<span class="sourceLineNo">117</span> if (this.chunkCount.compareAndSet(created, created + 1)) {<a name="line.117"></a> +<span class="sourceLineNo">118</span> break;<a name="line.118"></a> +<span class="sourceLineNo">119</span> }<a name="line.119"></a> +<span class="sourceLineNo">120</span> } else {<a name="line.120"></a> +<span class="sourceLineNo">121</span> break;<a name="line.121"></a> +<span class="sourceLineNo">122</span> }<a name="line.122"></a> +<span class="sourceLineNo">123</span> }<a name="line.123"></a> +<span class="sourceLineNo">124</span> }<a name="line.124"></a> +<span class="sourceLineNo">125</span> return chunk;<a name="line.125"></a> +<span class="sourceLineNo">126</span> }<a name="line.126"></a> +<span class="sourceLineNo">127</span><a name="line.127"></a> +<span class="sourceLineNo">128</span> /**<a name="line.128"></a> +<span class="sourceLineNo">129</span> * Add the chunks to the pool, when the pool achieves the max size, it will<a name="line.129"></a> +<span class="sourceLineNo">130</span> * skip the remaining chunks<a name="line.130"></a> +<span class="sourceLineNo">131</span> * @param chunks<a name="line.131"></a> +<span class="sourceLineNo">132</span> */<a name="line.132"></a> +<span class="sourceLineNo">133</span> synchronized void putbackChunks(BlockingQueue<Chunk> chunks) {<a name="line.133"></a> +<span class="sourceLineNo">134</span> int toAdd = Math.min(chunks.size(), this.maxCount - reclaimedChunks.size());<a name="line.134"></a> +<span class="sourceLineNo">135</span> Chunk chunk = null;<a name="line.135"></a> +<span class="sourceLineNo">136</span> while ((chunk = chunks.poll()) != null && toAdd > 0) {<a name="line.136"></a> +<span class="sourceLineNo">137</span> reclaimedChunks.add(chunk);<a name="line.137"></a> +<span class="sourceLineNo">138</span> toAdd--;<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><a name="line.141"></a> +<span class="sourceLineNo">142</span> /**<a name="line.142"></a> +<span class="sourceLineNo">143</span> * Add the chunk to the pool, if the pool has achieved the max size, it will<a name="line.143"></a> +<span class="sourceLineNo">144</span> * skip it<a name="line.144"></a> +<span class="sourceLineNo">145</span> * @param chunk<a name="line.145"></a> +<span class="sourceLineNo">146</span> */<a name="line.146"></a> +<span class="sourceLineNo">147</span> synchronized void putbackChunk(Chunk chunk) {<a name="line.147"></a> +<span class="sourceLineNo">148</span> if (reclaimedChunks.size() < this.maxCount) {<a name="line.148"></a> +<span class="sourceLineNo">149</span> reclaimedChunks.add(chunk);<a name="line.149"></a> +<span class="sourceLineNo">150</span> }<a name="line.150"></a> +<span class="sourceLineNo">151</span> }<a name="line.151"></a> +<span class="sourceLineNo">152</span><a name="line.152"></a> +<span class="sourceLineNo">153</span> int getPoolSize() {<a name="line.153"></a> +<span class="sourceLineNo">154</span> return this.reclaimedChunks.size();<a name="line.154"></a> +<span class="sourceLineNo">155</span> }<a name="line.155"></a> +<span class="sourceLineNo">156</span><a name="line.156"></a> +<span class="sourceLineNo">157</span> /*<a name="line.157"></a> +<span class="sourceLineNo">158</span> * Only used in testing<a name="line.158"></a> +<span class="sourceLineNo">159</span> */<a name="line.159"></a> +<span class="sourceLineNo">160</span> void clearChunks() {<a name="line.160"></a> +<span class="sourceLineNo">161</span> this.reclaimedChunks.clear();<a name="line.161"></a> +<span class="sourceLineNo">162</span> }<a name="line.162"></a> +<span class="sourceLineNo">163</span><a name="line.163"></a> +<span class="sourceLineNo">164</span> private class StatisticsThread extends Thread {<a name="line.164"></a> +<span class="sourceLineNo">165</span> StatisticsThread() {<a name="line.165"></a> +<span class="sourceLineNo">166</span> super("MemStoreChunkPool.StatisticsThread");<a name="line.166"></a> +<span class="sourceLineNo">167</span> setDaemon(true);<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> @Override<a name="line.170"></a> +<span class="sourceLineNo">171</span> public void run() {<a name="line.171"></a> +<span class="sourceLineNo">172</span> logStats();<a name="line.172"></a> +<span class="sourceLineNo">173</span> }<a name="line.173"></a> +<span class="sourceLineNo">174</span><a name="line.174"></a> +<span class="sourceLineNo">175</span> private void logStats() {<a name="line.175"></a> +<span class="sourceLineNo">176</span> if (!LOG.isDebugEnabled()) return;<a name="line.176"></a> +<span class="sourceLineNo">177</span> long created = chunkCount.get();<a name="line.177"></a> +<span class="sourceLineNo">178</span> long reused = reusedChunkCount.get();<a name="line.178"></a> +<span class="sourceLineNo">179</span> long total = created + reused;<a name="line.179"></a> +<span class="sourceLineNo">180</span> LOG.debug("Stats: current pool size=" + reclaimedChunks.size()<a name="line.180"></a> +<span class="sourceLineNo">181</span> + ",created chunk count=" + created<a name="line.181"></a> +<span class="sourceLineNo">182</span> + ",reused chunk count=" + reused<a name="line.182"></a> +<span class="sourceLineNo">183</span> + ",reuseRatio=" + (total == 0 ? "0" : StringUtils.formatPercent(<a name="line.183"></a> +<span class="sourceLineNo">184</span> (float) reused / (float) total, 2)));<a name="line.184"></a> +<span class="sourceLineNo">185</span> }<a name="line.185"></a> +<span class="sourceLineNo">186</span> }<a name="line.186"></a> +<span class="sourceLineNo">187</span><a name="line.187"></a> +<span class="sourceLineNo">188</span> /**<a name="line.188"></a> +<span class="sourceLineNo">189</span> * @return the global MemStoreChunkPool instance<a name="line.189"></a> +<span class="sourceLineNo">190</span> */<a name="line.190"></a> +<span class="sourceLineNo">191</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "LI_LAZY_INIT_STATIC",<a name="line.191"></a> +<span class="sourceLineNo">192</span> justification = "Method is called by single thread at the starting of RS")<a name="line.192"></a> +<span class="sourceLineNo">193</span> static MemStoreChunkPool initialize(long globalMemStoreSize, float poolSizePercentage,<a name="line.193"></a> +<span class="sourceLineNo">194</span> float initialCountPercentage, int chunkSize, boolean offheap) {<a name="line.194"></a> +<span class="sourceLineNo">195</span> if (GLOBAL_INSTANCE != null) return GLOBAL_INSTANCE;<a name="line.195"></a> +<span class="sourceLineNo">196</span> if (chunkPoolDisabled) return null;<a name="line.196"></a> +<span class="sourceLineNo">197</span><a name="line.197"></a> +<span class="sourceLineNo">198</span> if (poolSizePercentage <= 0) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> chunkPoolDisabled = true;<a name="line.199"></a> +<span class="sourceLineNo">200</span> return null;<a name="line.200"></a> +<span class="sourceLineNo">201</span> }<a name="line.201"></a> +<span class="sourceLineNo">202</span> if (poolSizePercentage > 1.0) {<a name="line.202"></a> +<span class="sourceLineNo">203</span> throw new IllegalArgumentException(<a name="line.203"></a> +<span class="sourceLineNo">204</span> MemStoreLAB.CHUNK_POOL_MAXSIZE_KEY + " must be between 0.0 and 1.0");<a name="line.204"></a> +<span class="sourceLineNo">205</span> }<a name="line.205"></a> +<span class="sourceLineNo">206</span> int maxCount = (int) (globalMemStoreSize * poolSizePercentage / chunkSize);<a name="line.206"></a> +<span class="sourceLineNo">207</span> if (initialCountPercentage > 1.0 || initialCountPercentage < 0) {<a name="line.207"></a> +<span class="sourceLineNo">208</span> throw new IllegalArgumentException(<a name="line.208"></a> +<span class="sourceLineNo">209</span> MemStoreLAB.CHUNK_POOL_INITIALSIZE_KEY + " must be between 0.0 and 1.0");<a name="line.209"></a> +<span class="sourceLineNo">210</span> }<a name="line.210"></a> +<span class="sourceLineNo">211</span> int initialCount = (int) (initialCountPercentage * maxCount);<a name="line.211"></a> +<span class="sourceLineNo">212</span> LOG.info("Allocating MemStoreChunkPool with chunk size " + StringUtils.byteDesc(chunkSize)<a name="line.212"></a> +<span class="sourceLineNo">213</span> + ", max count " + maxCount + ", initial count " + initialCount);<a name="line.213"></a> +<span class="sourceLineNo">214</span> GLOBAL_INSTANCE = new MemStoreChunkPool(chunkSize, maxCount, initialCount, poolSizePercentage,<a name="line.214"></a> +<span class="sourceLineNo">215</span> offheap);<a name="line.215"></a> +<span class="sourceLineNo">216</span> return GLOBAL_INSTANCE;<a name="line.216"></a> +<span class="sourceLineNo">217</span> }<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> * @return The singleton instance of this pool.<a name="line.220"></a> +<span class="sourceLineNo">221</span> */<a name="line.221"></a> +<span class="sourceLineNo">222</span> static MemStoreChunkPool getPool() {<a name="line.222"></a> +<span class="sourceLineNo">223</span> return GLOBAL_INSTANCE;<a name="line.223"></a> +<span class="sourceLineNo">224</span> }<a name="line.224"></a> +<span class="sourceLineNo">225</span><a name="line.225"></a> +<span class="sourceLineNo">226</span> int getMaxCount() {<a name="line.226"></a> +<span class="sourceLineNo">227</span> return this.maxCount;<a name="line.227"></a> +<span class="sourceLineNo">228</span> }<a name="line.228"></a> +<span class="sourceLineNo">229</span><a name="line.229"></a> +<span class="sourceLineNo">230</span> @VisibleForTesting<a name="line.230"></a> +<span class="sourceLineNo">231</span> static void clearDisableFlag() {<a name="line.231"></a> +<span class="sourceLineNo">232</span> chunkPoolDisabled = false;<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> @Override<a name="line.235"></a> +<span class="sourceLineNo">236</span> public void onHeapMemoryTune(long newMemstoreSize, long newBlockCacheSize) {<a name="line.236"></a> +<span class="sourceLineNo">237</span> // don't do any tuning in case of offheap memstore<a name="line.237"></a> +<span class="sourceLineNo">238</span> if (this.offheap) {<a name="line.238"></a> +<span class="sourceLineNo">239</span> LOG.warn("Not tuning the chunk pool as it is offheap");<a name="line.239"></a> +<span class="sourceLineNo">240</span> return;<a name="line.240"></a> +<span class="sourceLineNo">241</span> }<a name="line.241"></a> +<span class="sourceLineNo">242</span> int newMaxCount = (int) (newMemstoreSize * poolSizePercentage / chunkSize);<a name="line.242"></a> +<span class="sourceLineNo">243</span> if (newMaxCount != this.maxCount) {<a name="line.243"></a> +<span class="sourceLineNo">244</span> // We need an adjustment in the chunks numbers<a name="line.244"></a> +<span class="sourceLineNo">245</span> if (newMaxCount > this.maxCount) {<a name="line.245"></a> +<span class="sourceLineNo">246</span> // Max chunks getting increased. Just change the variable. Later calls to getChunk() would<a name="line.246"></a> +<span class="sourceLineNo">247</span> // create and add them to Q<a name="line.247"></a> +<span class="sourceLineNo">248</span> LOG.info("Max count for chunks increased from " + this.maxCount + " to " + newMaxCount);<a name="line.248"></a> +<span class="sourceLineNo">249</span> this.maxCount = newMaxCount;<a name="line.249"></a> +<span class="sourceLineNo">250</span> } else {<a name="line.250"></a> +<span class="sourceLineNo">251</span> // Max chunks getting decreased. We may need to clear off some of the pooled chunks now<a name="line.251"></a> +<span class="sourceLineNo">252</span> // itself. If the extra chunks are serving already, do not pool those when we get them back<a name="line.252"></a> +<span class="sourceLineNo">253</span> LOG.info("Max count for chunks decreased from " + this.maxCount + " to " + newMaxCount);<a name="line.253"></a> +<span class="sourceLineNo">254</span> this.maxCount = newMaxCount;<a name="line.254"></a> +<span class="sourceLineNo">255</span> if (this.reclaimedChunks.size() > newMaxCount) {<a name="line.255"></a> +<span class="sourceLineNo">256</span> synchronized (this) {<a name="line.256"></a> +<span class="sourceLineNo">257</span> while (this.reclaimedChunks.size() > newMaxCount) {<a name="line.257"></a> +<span class="sourceLineNo">258</span> this.reclaimedChunks.poll();<a name="line.258"></a> +<span class="sourceLineNo">259</span> }<a name="line.259"></a> +<span class="sourceLineNo">260</span> }<a name="line.260"></a> +<span class="sourceLineNo">261</span> }<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> }<a name="line.264"></a> +<span class="sourceLineNo">265</span>}<a name="line.265"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.html new file mode 100644 index 0000000..092287e --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.html @@ -0,0 +1,337 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html lang="en"> +<head> +<title>Source code</title> +<link rel="stylesheet" type="text/css" href="../../../../../../stylesheet.css" title="Style"> +</head> +<body> +<div class="sourceContainer"> +<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> +<span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a> +<span class="sourceLineNo">003</span> *<a name="line.3"></a> +<span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a> +<span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a> +<span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a> +<span class="sourceLineNo">007</span> * licenses this file 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 with the License.<a name="line.8"></a> +<span class="sourceLineNo">009</span> * 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, WITHOUT<a name="line.14"></a> +<span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a> +<span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a> +<span class="sourceLineNo">017</span> * 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 java.util.concurrent.BlockingQueue;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import java.util.concurrent.Executors;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.util.concurrent.TimeUnit;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.26"></a> +<span class="sourceLineNo">027</span><a name="line.27"></a> +<span class="sourceLineNo">028</span>import org.apache.commons.logging.Log;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import org.apache.commons.logging.LogFactory;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.HeapMemoryTuneObserver;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.hadoop.util.StringUtils;<a name="line.32"></a> +<span class="sourceLineNo">033</span><a name="line.33"></a> +<span class="sourceLineNo">034</span>import com.google.common.annotations.VisibleForTesting;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import com.google.common.util.concurrent.ThreadFactoryBuilder;<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> * A pool of {@link Chunk} instances.<a name="line.38"></a> +<span class="sourceLineNo">039</span> * <a name="line.39"></a> +<span class="sourceLineNo">040</span> * MemStoreChunkPool caches a number of retired chunks for reusing, it could<a name="line.40"></a> +<span class="sourceLineNo">041</span> * decrease allocating bytes when writing, thereby optimizing the garbage<a name="line.41"></a> +<span class="sourceLineNo">042</span> * collection on JVM.<a name="line.42"></a> +<span class="sourceLineNo">043</span> * <a name="line.43"></a> +<span class="sourceLineNo">044</span> * The pool instance is globally unique and could be obtained through<a name="line.44"></a> +<span class="sourceLineNo">045</span> * {@link MemStoreChunkPool#initialize(long, float, float, int, boolean)}<a name="line.45"></a> +<span class="sourceLineNo">046</span> * <a name="line.46"></a> +<span class="sourceLineNo">047</span> * {@link MemStoreChunkPool#getChunk()} is called when MemStoreLAB allocating<a name="line.47"></a> +<span class="sourceLineNo">048</span> * bytes, and {@link MemStoreChunkPool#putbackChunks(BlockingQueue)} is called<a name="line.48"></a> +<span class="sourceLineNo">049</span> * when MemStore clearing snapshot for flush<a name="line.49"></a> +<span class="sourceLineNo">050</span> */<a name="line.50"></a> +<span class="sourceLineNo">051</span>@SuppressWarnings("javadoc")<a name="line.51"></a> +<span class="sourceLineNo">052</span>@InterfaceAudience.Private<a name="line.52"></a> +<span class="sourceLineNo">053</span>public class MemStoreChunkPool implements HeapMemoryTuneObserver {<a name="line.53"></a> +<span class="sourceLineNo">054</span> private static final Log LOG = LogFactory.getLog(MemStoreChunkPool.class);<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span> // Static reference to the MemStoreChunkPool<a name="line.56"></a> +<span class="sourceLineNo">057</span> static MemStoreChunkPool GLOBAL_INSTANCE;<a name="line.57"></a> +<span class="sourceLineNo">058</span> /** Boolean whether we have disabled the memstore chunk pool entirely. */<a name="line.58"></a> +<span class="sourceLineNo">059</span> static boolean chunkPoolDisabled = false;<a name="line.59"></a> +<span class="sourceLineNo">060</span><a name="line.60"></a> +<span class="sourceLineNo">061</span> private int maxCount;<a name="line.61"></a> +<span class="sourceLineNo">062</span><a name="line.62"></a> +<span class="sourceLineNo">063</span> // A queue of reclaimed chunks<a name="line.63"></a> +<span class="sourceLineNo">064</span> private final BlockingQueue<Chunk> reclaimedChunks;<a name="line.64"></a> +<span class="sourceLineNo">065</span> private final int chunkSize;<a name="line.65"></a> +<span class="sourceLineNo">066</span> private final float poolSizePercentage;<a name="line.66"></a> +<span class="sourceLineNo">067</span><a name="line.67"></a> +<span class="sourceLineNo">068</span> /** Statistics thread schedule pool */<a name="line.68"></a> +<span class="sourceLineNo">069</span> private final ScheduledExecutorService scheduleThreadPool;<a name="line.69"></a> +<span class="sourceLineNo">070</span> /** Statistics thread */<a name="line.70"></a> +<span class="sourceLineNo">071</span> private static final int statThreadPeriod = 60 * 5;<a name="line.71"></a> +<span class="sourceLineNo">072</span> private final AtomicLong chunkCount = new AtomicLong();<a name="line.72"></a> +<span class="sourceLineNo">073</span> private final AtomicLong reusedChunkCount = new AtomicLong();<a name="line.73"></a> +<span class="sourceLineNo">074</span> private final boolean offheap;<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> MemStoreChunkPool(int chunkSize, int maxCount, int initialCount, float poolSizePercentage,<a name="line.76"></a> +<span class="sourceLineNo">077</span> boolean offheap) {<a name="line.77"></a> +<span class="sourceLineNo">078</span> this.maxCount = maxCount;<a name="line.78"></a> +<span class="sourceLineNo">079</span> this.chunkSize = chunkSize;<a name="line.79"></a> +<span class="sourceLineNo">080</span> this.poolSizePercentage = poolSizePercentage;<a name="line.80"></a> +<span class="sourceLineNo">081</span> this.offheap = offheap;<a name="line.81"></a> +<span class="sourceLineNo">082</span> this.reclaimedChunks = new LinkedBlockingQueue<>();<a name="line.82"></a> +<span class="sourceLineNo">083</span> for (int i = 0; i < initialCount; i++) {<a name="line.83"></a> +<span class="sourceLineNo">084</span> Chunk chunk = this.offheap ? new OffheapChunk(chunkSize) : new OnheapChunk(chunkSize);<a name="line.84"></a> +<span class="sourceLineNo">085</span> chunk.init();<a name="line.85"></a> +<span class="sourceLineNo">086</span> reclaimedChunks.add(chunk);<a name="line.86"></a> +<span class="sourceLineNo">087</span> }<a name="line.87"></a> +<span class="sourceLineNo">088</span> chunkCount.set(initialCount);<a name="line.88"></a> +<span class="sourceLineNo">089</span> final String n = Thread.currentThread().getName();<a name="line.89"></a> +<span class="sourceLineNo">090</span> scheduleThreadPool = Executors.newScheduledThreadPool(1, new ThreadFactoryBuilder()<a name="line.90"></a> +<span class="sourceLineNo">091</span> .setNameFormat(n + "-MemStoreChunkPool Statistics").setDaemon(true).build());<a name="line.91"></a> +<span class="sourceLineNo">092</span> this.scheduleThreadPool.scheduleAtFixedRate(new StatisticsThread(), statThreadPeriod,<a name="line.92"></a> +<span class="sourceLineNo">093</span> statThreadPeriod, TimeUnit.SECONDS);<a name="line.93"></a> +<span class="sourceLineNo">094</span> }<a name="line.94"></a> +<span class="sourceLineNo">095</span><a name="line.95"></a> +<span class="sourceLineNo">096</span> /**<a name="line.96"></a> +<span class="sourceLineNo">097</span> * Poll a chunk from the pool, reset it if not null, else create a new chunk to return if we have<a name="line.97"></a> +<span class="sourceLineNo">098</span> * not yet created max allowed chunks count. When we have already created max allowed chunks and<a name="line.98"></a> +<span class="sourceLineNo">099</span> * no free chunks as of now, return null. It is the responsibility of the caller to make a chunk<a name="line.99"></a> +<span class="sourceLineNo">100</span> * then.<a name="line.100"></a> +<span class="sourceLineNo">101</span> * Note: Chunks returned by this pool must be put back to the pool after its use.<a name="line.101"></a> +<span class="sourceLineNo">102</span> * @return a chunk<a name="line.102"></a> +<span class="sourceLineNo">103</span> * @see #putbackChunk(Chunk)<a name="line.103"></a> +<span class="sourceLineNo">104</span> * @see #putbackChunks(BlockingQueue)<a name="line.104"></a> +<span class="sourceLineNo">105</span> */<a name="line.105"></a> +<span class="sourceLineNo">106</span> Chunk getChunk() {<a name="line.106"></a> +<span class="sourceLineNo">107</span> Chunk chunk = reclaimedChunks.poll();<a name="line.107"></a> +<span class="sourceLineNo">108</span> if (chunk != null) {<a name="line.108"></a> +<span class="sourceLineNo">109</span> chunk.reset();<a name="line.109"></a> +<span class="sourceLineNo">110</span> reusedChunkCount.incrementAndGet();<a name="line.110"></a> +<span class="sourceLineNo">111</span> } else {<a name="line.111"></a> +<span class="sourceLineNo">112</span> // Make a chunk iff we have not yet created the maxCount chunks<a name="line.112"></a> +<span class="sourceLineNo">113</span> while (true) {<a name="line.113"></a> +<span class="sourceLineNo">114</span> long created = this.chunkCount.get();<a name="line.114"></a> +<span class="sourceLineNo">115</span> if (created < this.maxCount) {<a name="line.115"></a> +<span class="sourceLineNo">116</span> chunk = this.offheap ? new OffheapChunk(this.chunkSize) : new OnheapChunk(this.chunkSize);<a name="line.116"></a> +<span class="sourceLineNo">117</span> if (this.chunkCount.compareAndSet(created, created + 1)) {<a name="line.117"></a> +<span class="sourceLineNo">118</span> break;<a name="line.118"></a> +<span class="sourceLineNo">119</span> }<a name="line.119"></a> +<span class="sourceLineNo">120</span> } else {<a name="line.120"></a> +<span class="sourceLineNo">121</span> break;<a name="line.121"></a> +<span class="sourceLineNo">122</span> }<a name="line.122"></a> +<span class="sourceLineNo">123</span> }<a name="line.123"></a> +<span class="sourceLineNo">124</span> }<a name="line.124"></a> +<span class="sourceLineNo">125</span> return chunk;<a name="line.125"></a> +<span class="sourceLineNo">126</span> }<a name="line.126"></a> +<span class="sourceLineNo">127</span><a name="line.127"></a> +<span class="sourceLineNo">128</span> /**<a name="line.128"></a> +<span class="sourceLineNo">129</span> * Add the chunks to the pool, when the pool achieves the max size, it will<a name="line.129"></a> +<span class="sourceLineNo">130</span> * skip the remaining chunks<a name="line.130"></a> +<span class="sourceLineNo">131</span> * @param chunks<a name="line.131"></a> +<span class="sourceLineNo">132</span> */<a name="line.132"></a> +<span class="sourceLineNo">133</span> synchronized void putbackChunks(BlockingQueue<Chunk> chunks) {<a name="line.133"></a> +<span class="sourceLineNo">134</span> int toAdd = Math.min(chunks.size(), this.maxCount - reclaimedChunks.size());<a name="line.134"></a> +<span class="sourceLineNo">135</span> Chunk chunk = null;<a name="line.135"></a> +<span class="sourceLineNo">136</span> while ((chunk = chunks.poll()) != null && toAdd > 0) {<a name="line.136"></a> +<span class="sourceLineNo">137</span> reclaimedChunks.add(chunk);<a name="line.137"></a> +<span class="sourceLineNo">138</span> toAdd--;<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><a name="line.141"></a> +<span class="sourceLineNo">142</span> /**<a name="line.142"></a> +<span class="sourceLineNo">143</span> * Add the chunk to the pool, if the pool has achieved the max size, it will<a name="line.143"></a> +<span class="sourceLineNo">144</span> * skip it<a name="line.144"></a> +<span class="sourceLineNo">145</span> * @param chunk<a name="line.145"></a> +<span class="sourceLineNo">146</span> */<a name="line.146"></a> +<span class="sourceLineNo">147</span> synchronized void putbackChunk(Chunk chunk) {<a name="line.147"></a> +<span class="sourceLineNo">148</span> if (reclaimedChunks.size() < this.maxCount) {<a name="line.148"></a> +<span class="sourceLineNo">149</span> reclaimedChunks.add(chunk);<a name="line.149"></a> +<span class="sourceLineNo">150</span> }<a name="line.150"></a> +<span class="sourceLineNo">151</span> }<a name="line.151"></a> +<span class="sourceLineNo">152</span><a name="line.152"></a> +<span class="sourceLineNo">153</span> int getPoolSize() {<a name="line.153"></a> +<span class="sourceLineNo">154</span> return this.reclaimedChunks.size();<a name="line.154"></a> +<span class="sourceLineNo">155</span> }<a name="line.155"></a> +<span class="sourceLineNo">156</span><a name="line.156"></a> +<span class="sourceLineNo">157</span> /*<a name="line.157"></a> +<span class="sourceLineNo">158</span> * Only used in testing<a name="line.158"></a> +<span class="sourceLineNo">159</span> */<a name="line.159"></a> +<span class="sourceLineNo">160</span> void clearChunks() {<a name="line.160"></a> +<span class="sourceLineNo">161</span> this.reclaimedChunks.clear();<a name="line.161"></a> +<span class="sourceLineNo">162</span> }<a name="line.162"></a> +<span class="sourceLineNo">163</span><a name="line.163"></a> +<span class="sourceLineNo">164</span> private class StatisticsThread extends Thread {<a name="line.164"></a> +<span class="sourceLineNo">165</span> StatisticsThread() {<a name="line.165"></a> +<span class="sourceLineNo">166</span> super("MemStoreChunkPool.StatisticsThread");<a name="line.166"></a> +<span class="sourceLineNo">167</span> setDaemon(true);<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> @Override<a name="line.170"></a> +<span class="sourceLineNo">171</span> public void run() {<a name="line.171"></a> +<span class="sourceLineNo">172</span> logStats();<a name="line.172"></a> +<span class="sourceLineNo">173</span> }<a name="line.173"></a> +<span class="sourceLineNo">174</span><a name="line.174"></a> +<span class="sourceLineNo">175</span> private void logStats() {<a name="line.175"></a> +<span class="sourceLineNo">176</span> if (!LOG.isDebugEnabled()) return;<a name="line.176"></a> +<span class="sourceLineNo">177</span> long created = chunkCount.get();<a name="line.177"></a> +<span class="sourceLineNo">178</span> long reused = reusedChunkCount.get();<a name="line.178"></a> +<span class="sourceLineNo">179</span> long total = created + reused;<a name="line.179"></a> +<span class="sourceLineNo">180</span> LOG.debug("Stats: current pool size=" + reclaimedChunks.size()<a name="line.180"></a> +<span class="sourceLineNo">181</span> + ",created chunk count=" + created<a name="line.181"></a> +<span class="sourceLineNo">182</span> + ",reused chunk count=" + reused<a name="line.182"></a> +<span class="sourceLineNo">183</span> + ",reuseRatio=" + (total == 0 ? "0" : StringUtils.formatPercent(<a name="line.183"></a> +<span class="sourceLineNo">184</span> (float) reused / (float) total, 2)));<a name="line.184"></a> +<span class="sourceLineNo">185</span> }<a name="line.185"></a> +<span class="sourceLineNo">186</span> }<a name="line.186"></a> +<span class="sourceLineNo">187</span><a name="line.187"></a> +<span class="sourceLineNo">188</span> /**<a name="line.188"></a> +<span class="sourceLineNo">189</span> * @return the global MemStoreChunkPool instance<a name="line.189"></a> +<span class="sourceLineNo">190</span> */<a name="line.190"></a> +<span class="sourceLineNo">191</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "LI_LAZY_INIT_STATIC",<a name="line.191"></a> +<span class="sourceLineNo">192</span> justification = "Method is called by single thread at the starting of RS")<a name="line.192"></a> +<span class="sourceLineNo">193</span> static MemStoreChunkPool initialize(long globalMemStoreSize, float poolSizePercentage,<a name="line.193"></a> +<span class="sourceLineNo">194</span> float initialCountPercentage, int chunkSize, boolean offheap) {<a name="line.194"></a> +<span class="sourceLineNo">195</span> if (GLOBAL_INSTANCE != null) return GLOBAL_INSTANCE;<a name="line.195"></a> +<span class="sourceLineNo">196</span> if (chunkPoolDisabled) return null;<a name="line.196"></a> +<span class="sourceLineNo">197</span><a name="line.197"></a> +<span class="sourceLineNo">198</span> if (poolSizePercentage <= 0) {<a name="line.198"></a> +<span class="sourceLineNo">199</span> chunkPoolDisabled = true;<a name="line.199"></a> +<span class="sourceLineNo">200</span> return null;<a name="line.200"></a> +<span class="sourceLineNo">201</span> }<a name="line.201"></a> +<span class="sourceLineNo">202</span> if (poolSizePercentage > 1.0) {<a name="line.202"></a> +<span class="sourceLineNo">203</span> throw new IllegalArgumentException(<a name="line.203"></a> +<span class="sourceLineNo">204</span> MemStoreLAB.CHUNK_POOL_MAXSIZE_KEY + " must be between 0.0 and 1.0");<a name="line.204"></a> +<span class="sourceLineNo">205</span> }<a name="line.205"></a> +<span class="sourceLineNo">206</span> int maxCount = (int) (globalMemStoreSize * poolSizePercentage / chunkSize);<a name="line.206"></a> +<span class="sourceLineNo">207</span> if (initialCountPercentage > 1.0 || initialCountPercentage < 0) {<a name="line.207"></a> +<span class="sourceLineNo">208</span> throw new IllegalArgumentException(<a name="line.208"></a> +<span class="sourceLineNo">209</span> MemStoreLAB.CHUNK_POOL_INITIALSIZE_KEY + " must be between 0.0 and 1.0");<a name="line.209"></a> +<span class="sourceLineNo">210</span> }<a name="line.210"></a> +<span class="sourceLineNo">211</span> int initialCount = (int) (initialCountPercentage * maxCount);<a name="line.211"></a> +<span class="sourceLineNo">212</span> LOG.info("Allocating MemStoreChunkPool with chunk size " + StringUtils.byteDesc(chunkSize)<a name="line.212"></a> +<span class="sourceLineNo">213</span> + ", max count " + maxCount + ", initial count " + initialCount);<a name="line.213"></a> +<span class="sourceLineNo">214</span> GLOBAL_INSTANCE = new MemStoreChunkPool(chunkSize, maxCount, initialCount, poolSizePercentage,<a name="line.214"></a> +<span class="sourceLineNo">215</span> offheap);<a name="line.215"></a> +<span class="sourceLineNo">216</span> return GLOBAL_INSTANCE;<a name="line.216"></a> +<span class="sourceLineNo">217</span> }<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> * @return The singleton instance of this pool.<a name="line.220"></a> +<span class="sourceLineNo">221</span> */<a name="line.221"></a> +<span class="sourceLineNo">222</span> static MemStoreChunkPool getPool() {<a name="line.222"></a> +<span class="sourceLineNo">223</span> return GLOBAL_INSTANCE;<a name="line.223"></a> +<span class="sourceLineNo">224</span> }<a name="line.224"></a> +<span class="sourceLineNo">225</span><a name="line.225"></a> +<span class="sourceLineNo">226</span> int getMaxCount() {<a name="line.226"></a> +<span class="sourceLineNo">227</span> return this.maxCount;<a name="line.227"></a> +<span class="sourceLineNo">228</span> }<a name="line.228"></a> +<span class="sourceLineNo">229</span><a name="line.229"></a> +<span class="sourceLineNo">230</span> @VisibleForTesting<a name="line.230"></a> +<span class="sourceLineNo">231</span> static void clearDisableFlag() {<a name="line.231"></a> +<span class="sourceLineNo">232</span> chunkPoolDisabled = false;<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> @Override<a name="line.235"></a> +<span class="sourceLineNo">236</span> public void onHeapMemoryTune(long newMemstoreSize, long newBlockCacheSize) {<a name="line.236"></a> +<span class="sourceLineNo">237</span> // don't do any tuning in case of offheap memstore<a name="line.237"></a> +<span class="sourceLineNo">238</span> if (this.offheap) {<a name="line.238"></a> +<span class="sourceLineNo">239</span> LOG.warn("Not tuning the chunk pool as it is offheap");<a name="line.239"></a> +<span class="sourceLineNo">240</span> return;<a name="line.240"></a> +<span class="sourceLineNo">241</span> }<a name="line.241"></a> +<span class="sourceLineNo">242</span> int newMaxCount = (int) (newMemstoreSize * poolSizePercentage / chunkSize);<a name="line.242"></a> +<span class="sourceLineNo">243</span> if (newMaxCount != this.maxCount) {<a name="line.243"></a> +<span class="sourceLineNo">244</span> // We need an adjustment in the chunks numbers<a name="line.244"></a> +<span class="sourceLineNo">245</span> if (newMaxCount > this.maxCount) {<a name="line.245"></a> +<span class="sourceLineNo">246</span> // Max chunks getting increased. Just change the variable. Later calls to getChunk() would<a name="line.246"></a> +<span class="sourceLineNo">247</span> // create and add them to Q<a name="line.247"></a> +<span class="sourceLineNo">248</span> LOG.info("Max count for chunks increased from " + this.maxCount + " to " + newMaxCount);<a name="line.248"></a> +<span class="sourceLineNo">249</span> this.maxCount = newMaxCount;<a name="line.249"></a> +<span class="sourceLineNo">250</span> } else {<a name="line.250"></a> +<span class="sourceLineNo">251</span> // Max chunks getting decreased. We may need to clear off some of the pooled chunks now<a name="line.251"></a> +<span class="sourceLineNo">252</span> // itself. If the extra chunks are serving already, do not pool those when we get them back<a name="line.252"></a> +<span class="sourceLineNo">253</span> LOG.info("Max count for chunks decreased from " + this.maxCount + " to " + newMaxCount);<a name="line.253"></a> +<span class="sourceLineNo">254</span> this.maxCount = newMaxCount;<a name="line.254"></a> +<span class="sourceLineNo">255</span> if (this.reclaimedChunks.size() > newMaxCount) {<a name="line.255"></a> +<span class="sourceLineNo">256</span> synchronized (this) {<a name="line.256"></a> +<span class="sourceLineNo">257</span> while (this.reclaimedChunks.size() > newMaxCount) {<a name="line.257"></a> +<span class="sourceLineNo">258</span> this.reclaimedChunks.poll();<a name="line.258"></a> +<span class="sourceLineNo">259</span> }<a name="line.259"></a> +<span class="sourceLineNo">260</span> }<a name="line.260"></a> +<span class="sourceLineNo">261</span> }<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> }<a name="line.264"></a> +<span class="sourceLineNo">265</span>}<a name="line.265"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html> http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html index 6200709..564f9a2 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreLAB.html @@ -35,7 +35,7 @@ <span class="sourceLineNo">027</span> * <p><a name="line.27"></a> <span class="sourceLineNo">028</span> * The MemStoreLAB is basically a bump-the-pointer allocator that allocates big (2MB) chunks from<a name="line.28"></a> <span class="sourceLineNo">029</span> * and then doles it out to threads that request slices into the array. These chunks can get pooled<a name="line.29"></a> -<span class="sourceLineNo">030</span> * as well. See {@link ChunkCreator}.<a name="line.30"></a> +<span class="sourceLineNo">030</span> * as well. See {@link MemStoreChunkPool}.<a name="line.30"></a> <span class="sourceLineNo">031</span> * <p><a name="line.31"></a> <span class="sourceLineNo">032</span> * The purpose of this is to combat heap fragmentation in the regionserver. By ensuring that all<a name="line.32"></a> <span class="sourceLineNo">033</span> * Cells in a given memstore refer only to large chunks of contiguous memory, we ensure that<a name="line.33"></a> @@ -49,7 +49,7 @@ <span class="sourceLineNo">041</span> * {@link #copyCellInto(Cell)} gets called. This allocates enough size in the chunk to hold this<a name="line.41"></a> <span class="sourceLineNo">042</span> * cell's data and copies into this area and then recreate a Cell over this copied data.<a name="line.42"></a> <span class="sourceLineNo">043</span> * <p><a name="line.43"></a> -<span class="sourceLineNo">044</span> * @see ChunkCreator<a name="line.44"></a> +<span class="sourceLineNo">044</span> * @see MemStoreChunkPool<a name="line.44"></a> <span class="sourceLineNo">045</span> */<a name="line.45"></a> <span class="sourceLineNo">046</span>@InterfaceAudience.Private<a name="line.46"></a> <span class="sourceLineNo">047</span>public interface MemStoreLAB {<a name="line.47"></a>