[14/51] [partial] hbase-site git commit: Published site at 82d554e3783372cc6b05489452c815b57c06f6cd.

Tue, 18 Apr 2017 07:59:00 -0700 

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/MemStoreChunkPool.StatisticsThread.html
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+<!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&lt;Chunk&gt; 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&lt;&gt;();<a name="line.82"></a>
+<span class="sourceLineNo">083</span>    for (int i = 0; i &lt; 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 &lt; 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&lt;Chunk&gt; 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 &amp;&amp; toAdd &gt; 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() &lt; 
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 &lt;= 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 &gt; 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 &gt; 1.0 
|| initialCountPercentage &lt; 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 &gt; 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() 
&gt; 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() &gt; 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>
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+</div>
+</body>
+</html>

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+<!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&lt;Chunk&gt; 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&lt;&gt;();<a name="line.82"></a>
+<span class="sourceLineNo">083</span>    for (int i = 0; i &lt; 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 &lt; 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&lt;Chunk&gt; 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 &amp;&amp; toAdd &gt; 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() &lt; 
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 &lt;= 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 &gt; 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 &gt; 1.0 
|| initialCountPercentage &lt; 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 &gt; 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() 
&gt; 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() &gt; 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>
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+</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> * &lt;p&gt;<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> * &lt;p&gt;<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> * &lt;p&gt;<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>

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