http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.MemStoreChunkPool.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.MemStoreChunkPool.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.MemStoreChunkPool.html deleted file mode 100644 index ffb6f14..0000000 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.MemStoreChunkPool.html +++ /dev/null @@ -1,476 +0,0 @@ -<!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>/**<a name="line.2"></a> -<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> -<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> -<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> -<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> -<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> -<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> -<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> -<span class="sourceLineNo">010</span> *<a name="line.10"></a> -<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> -<span class="sourceLineNo">012</span> *<a name="line.12"></a> -<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> -<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> -<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> -<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> -<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> -<span class="sourceLineNo">018</span> */<a name="line.18"></a> -<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> -<span class="sourceLineNo">020</span><a name="line.20"></a> -<span class="sourceLineNo">021</span>import java.lang.ref.SoftReference;<a name="line.21"></a> -<span class="sourceLineNo">022</span>import java.util.Iterator;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import java.util.Set;<a name="line.24"></a> -<span class="sourceLineNo">025</span>import java.util.concurrent.BlockingQueue;<a name="line.25"></a> -<span class="sourceLineNo">026</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import java.util.concurrent.Executors;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import java.util.concurrent.TimeUnit;<a name="line.30"></a> -<span class="sourceLineNo">031</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.32"></a> -<span class="sourceLineNo">033</span><a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.commons.logging.Log;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.commons.logging.LogFactory;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.HeapMemoryTuneObserver;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import org.apache.hadoop.util.StringUtils;<a name="line.38"></a> -<span class="sourceLineNo">039</span><a name="line.39"></a> -<span class="sourceLineNo">040</span>import com.google.common.annotations.VisibleForTesting;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.41"></a> -<span class="sourceLineNo">042</span><a name="line.42"></a> -<span class="sourceLineNo">043</span>/**<a name="line.43"></a> -<span class="sourceLineNo">044</span> * Does the management of memstoreLAB chunk creations. A monotonically incrementing id is associated<a name="line.44"></a> -<span class="sourceLineNo">045</span> * with every chunk<a name="line.45"></a> -<span class="sourceLineNo">046</span> */<a name="line.46"></a> -<span class="sourceLineNo">047</span>@InterfaceAudience.Private<a name="line.47"></a> -<span class="sourceLineNo">048</span>public class ChunkCreator {<a name="line.48"></a> -<span class="sourceLineNo">049</span> private final Log LOG = LogFactory.getLog(ChunkCreator.class);<a name="line.49"></a> -<span class="sourceLineNo">050</span> // monotonically increasing chunkid<a name="line.50"></a> -<span class="sourceLineNo">051</span> private AtomicInteger chunkID = new AtomicInteger(1);<a name="line.51"></a> -<span class="sourceLineNo">052</span> // maps the chunk against the monotonically increasing chunk id. We need to preserve the<a name="line.52"></a> -<span class="sourceLineNo">053</span> // natural ordering of the key<a name="line.53"></a> -<span class="sourceLineNo">054</span> // CellChunkMap creation should convert the soft ref to hard reference<a name="line.54"></a> -<span class="sourceLineNo">055</span> private Map<Integer, SoftReference<Chunk>> chunkIdMap =<a name="line.55"></a> -<span class="sourceLineNo">056</span> new ConcurrentHashMap<Integer, SoftReference<Chunk>>();<a name="line.56"></a> -<span class="sourceLineNo">057</span> private final int chunkSize;<a name="line.57"></a> -<span class="sourceLineNo">058</span> private final boolean offheap;<a name="line.58"></a> -<span class="sourceLineNo">059</span> @VisibleForTesting<a name="line.59"></a> -<span class="sourceLineNo">060</span> static ChunkCreator INSTANCE;<a name="line.60"></a> -<span class="sourceLineNo">061</span> @VisibleForTesting<a name="line.61"></a> -<span class="sourceLineNo">062</span> static boolean chunkPoolDisabled = false;<a name="line.62"></a> -<span class="sourceLineNo">063</span> private MemStoreChunkPool pool;<a name="line.63"></a> -<span class="sourceLineNo">064</span><a name="line.64"></a> -<span class="sourceLineNo">065</span> @VisibleForTesting<a name="line.65"></a> -<span class="sourceLineNo">066</span> ChunkCreator(int chunkSize, boolean offheap, long globalMemStoreSize, float poolSizePercentage,<a name="line.66"></a> -<span class="sourceLineNo">067</span> float initialCountPercentage, HeapMemoryManager heapMemoryManager) {<a name="line.67"></a> -<span class="sourceLineNo">068</span> this.chunkSize = chunkSize;<a name="line.68"></a> -<span class="sourceLineNo">069</span> this.offheap = offheap;<a name="line.69"></a> -<span class="sourceLineNo">070</span> this.pool = initializePool(globalMemStoreSize, poolSizePercentage, initialCountPercentage);<a name="line.70"></a> -<span class="sourceLineNo">071</span> if (heapMemoryManager != null && this.pool != null) {<a name="line.71"></a> -<span class="sourceLineNo">072</span> // Register with Heap Memory manager<a name="line.72"></a> -<span class="sourceLineNo">073</span> heapMemoryManager.registerTuneObserver(this.pool);<a name="line.73"></a> -<span class="sourceLineNo">074</span> }<a name="line.74"></a> -<span class="sourceLineNo">075</span> }<a name="line.75"></a> -<span class="sourceLineNo">076</span><a name="line.76"></a> -<span class="sourceLineNo">077</span> /**<a name="line.77"></a> -<span class="sourceLineNo">078</span> * Initializes the instance of MSLABChunkCreator<a name="line.78"></a> -<span class="sourceLineNo">079</span> * @param chunkSize the chunkSize<a name="line.79"></a> -<span class="sourceLineNo">080</span> * @param offheap indicates if the chunk is to be created offheap or not<a name="line.80"></a> -<span class="sourceLineNo">081</span> * @param globalMemStoreSize the global memstore size<a name="line.81"></a> -<span class="sourceLineNo">082</span> * @param poolSizePercentage pool size percentage<a name="line.82"></a> -<span class="sourceLineNo">083</span> * @param initialCountPercentage the initial count of the chunk pool if any<a name="line.83"></a> -<span class="sourceLineNo">084</span> * @param heapMemoryManager the heapmemory manager<a name="line.84"></a> -<span class="sourceLineNo">085</span> * @return singleton MSLABChunkCreator<a name="line.85"></a> -<span class="sourceLineNo">086</span> */<a name="line.86"></a> -<span class="sourceLineNo">087</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "LI_LAZY_INIT_STATIC",<a name="line.87"></a> -<span class="sourceLineNo">088</span> justification = "Method is called by single thread at the starting of RS")<a name="line.88"></a> -<span class="sourceLineNo">089</span> @VisibleForTesting<a name="line.89"></a> -<span class="sourceLineNo">090</span> public static ChunkCreator initialize(int chunkSize, boolean offheap, long globalMemStoreSize,<a name="line.90"></a> -<span class="sourceLineNo">091</span> float poolSizePercentage, float initialCountPercentage, HeapMemoryManager heapMemoryManager) {<a name="line.91"></a> -<span class="sourceLineNo">092</span> if (INSTANCE != null) return INSTANCE;<a name="line.92"></a> -<span class="sourceLineNo">093</span> INSTANCE = new ChunkCreator(chunkSize, offheap, globalMemStoreSize, poolSizePercentage,<a name="line.93"></a> -<span class="sourceLineNo">094</span> initialCountPercentage, heapMemoryManager);<a name="line.94"></a> -<span class="sourceLineNo">095</span> return INSTANCE;<a name="line.95"></a> -<span class="sourceLineNo">096</span> }<a name="line.96"></a> -<span class="sourceLineNo">097</span><a name="line.97"></a> -<span class="sourceLineNo">098</span> static ChunkCreator getInstance() {<a name="line.98"></a> -<span class="sourceLineNo">099</span> return INSTANCE;<a name="line.99"></a> -<span class="sourceLineNo">100</span> }<a name="line.100"></a> -<span class="sourceLineNo">101</span><a name="line.101"></a> -<span class="sourceLineNo">102</span> /**<a name="line.102"></a> -<span class="sourceLineNo">103</span> * Creates and inits a chunk.<a name="line.103"></a> -<span class="sourceLineNo">104</span> * @return the chunk that was initialized<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 = null;<a name="line.107"></a> -<span class="sourceLineNo">108</span> if (pool != null) {<a name="line.108"></a> -<span class="sourceLineNo">109</span> // the pool creates the chunk internally. The chunk#init() call happens here<a name="line.109"></a> -<span class="sourceLineNo">110</span> chunk = this.pool.getChunk();<a name="line.110"></a> -<span class="sourceLineNo">111</span> // the pool has run out of maxCount<a name="line.111"></a> -<span class="sourceLineNo">112</span> if (chunk == null) {<a name="line.112"></a> -<span class="sourceLineNo">113</span> if (LOG.isTraceEnabled()) {<a name="line.113"></a> -<span class="sourceLineNo">114</span> LOG.trace("The chunk pool is full. Reached maxCount= " + this.pool.getMaxCount()<a name="line.114"></a> -<span class="sourceLineNo">115</span> + ". Creating chunk onheap.");<a name="line.115"></a> -<span class="sourceLineNo">116</span> }<a name="line.116"></a> -<span class="sourceLineNo">117</span> }<a name="line.117"></a> -<span class="sourceLineNo">118</span> }<a name="line.118"></a> -<span class="sourceLineNo">119</span> if (chunk == null) {<a name="line.119"></a> -<span class="sourceLineNo">120</span> chunk = createChunk();<a name="line.120"></a> -<span class="sourceLineNo">121</span> }<a name="line.121"></a> -<span class="sourceLineNo">122</span> // put this chunk into the chunkIdMap<a name="line.122"></a> -<span class="sourceLineNo">123</span> this.chunkIdMap.put(chunk.getId(), new SoftReference<>(chunk));<a name="line.123"></a> -<span class="sourceLineNo">124</span> // now we need to actually do the expensive memory allocation step in case of a new chunk,<a name="line.124"></a> -<span class="sourceLineNo">125</span> // else only the offset is set to the beginning of the chunk to accept allocations<a name="line.125"></a> -<span class="sourceLineNo">126</span> chunk.init();<a name="line.126"></a> -<span class="sourceLineNo">127</span> return chunk;<a name="line.127"></a> -<span class="sourceLineNo">128</span> }<a name="line.128"></a> -<span class="sourceLineNo">129</span><a name="line.129"></a> -<span class="sourceLineNo">130</span> private Chunk createChunk() {<a name="line.130"></a> -<span class="sourceLineNo">131</span> return createChunk(false);<a name="line.131"></a> -<span class="sourceLineNo">132</span> }<a name="line.132"></a> -<span class="sourceLineNo">133</span><a name="line.133"></a> -<span class="sourceLineNo">134</span> /**<a name="line.134"></a> -<span class="sourceLineNo">135</span> * Creates the chunk either onheap or offheap<a name="line.135"></a> -<span class="sourceLineNo">136</span> * @param pool indicates if the chunks have to be created which will be used by the Pool<a name="line.136"></a> -<span class="sourceLineNo">137</span> * @return the chunk<a name="line.137"></a> -<span class="sourceLineNo">138</span> */<a name="line.138"></a> -<span class="sourceLineNo">139</span> private Chunk createChunk(boolean pool) {<a name="line.139"></a> -<span class="sourceLineNo">140</span> int id = chunkID.getAndIncrement();<a name="line.140"></a> -<span class="sourceLineNo">141</span> assert id > 0;<a name="line.141"></a> -<span class="sourceLineNo">142</span> // do not create offheap chunk on demand<a name="line.142"></a> -<span class="sourceLineNo">143</span> if (pool && this.offheap) {<a name="line.143"></a> -<span class="sourceLineNo">144</span> return new OffheapChunk(chunkSize, id, pool);<a name="line.144"></a> -<span class="sourceLineNo">145</span> } else {<a name="line.145"></a> -<span class="sourceLineNo">146</span> return new OnheapChunk(chunkSize, id, pool);<a name="line.146"></a> -<span class="sourceLineNo">147</span> }<a name="line.147"></a> -<span class="sourceLineNo">148</span> }<a name="line.148"></a> -<span class="sourceLineNo">149</span><a name="line.149"></a> -<span class="sourceLineNo">150</span> @VisibleForTesting<a name="line.150"></a> -<span class="sourceLineNo">151</span> // TODO : To be used by CellChunkMap<a name="line.151"></a> -<span class="sourceLineNo">152</span> Chunk getChunk(int id) {<a name="line.152"></a> -<span class="sourceLineNo">153</span> SoftReference<Chunk> ref = chunkIdMap.get(id);<a name="line.153"></a> -<span class="sourceLineNo">154</span> if (ref != null) {<a name="line.154"></a> -<span class="sourceLineNo">155</span> return ref.get();<a name="line.155"></a> -<span class="sourceLineNo">156</span> }<a name="line.156"></a> -<span class="sourceLineNo">157</span> return null;<a name="line.157"></a> -<span class="sourceLineNo">158</span> }<a name="line.158"></a> -<span class="sourceLineNo">159</span><a name="line.159"></a> -<span class="sourceLineNo">160</span> int getChunkSize() {<a name="line.160"></a> -<span class="sourceLineNo">161</span> return this.chunkSize;<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> boolean isOffheap() {<a name="line.164"></a> -<span class="sourceLineNo">165</span> return this.offheap;<a name="line.165"></a> -<span class="sourceLineNo">166</span> }<a name="line.166"></a> -<span class="sourceLineNo">167</span><a name="line.167"></a> -<span class="sourceLineNo">168</span> private void removeChunks(Set<Integer> chunkIDs) {<a name="line.168"></a> -<span class="sourceLineNo">169</span> this.chunkIdMap.keySet().removeAll(chunkIDs);<a name="line.169"></a> -<span class="sourceLineNo">170</span> }<a name="line.170"></a> -<span class="sourceLineNo">171</span><a name="line.171"></a> -<span class="sourceLineNo">172</span> Chunk removeChunk(int chunkId) {<a name="line.172"></a> -<span class="sourceLineNo">173</span> SoftReference<Chunk> ref = this.chunkIdMap.remove(chunkId);<a name="line.173"></a> -<span class="sourceLineNo">174</span> if (ref != null) {<a name="line.174"></a> -<span class="sourceLineNo">175</span> return ref.get();<a name="line.175"></a> -<span class="sourceLineNo">176</span> }<a name="line.176"></a> -<span class="sourceLineNo">177</span> return null;<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span><a name="line.179"></a> -<span class="sourceLineNo">180</span> @VisibleForTesting<a name="line.180"></a> -<span class="sourceLineNo">181</span> int size() {<a name="line.181"></a> -<span class="sourceLineNo">182</span> return this.chunkIdMap.size();<a name="line.182"></a> -<span class="sourceLineNo">183</span> }<a name="line.183"></a> -<span class="sourceLineNo">184</span><a name="line.184"></a> -<span class="sourceLineNo">185</span> @VisibleForTesting<a name="line.185"></a> -<span class="sourceLineNo">186</span> void clearChunkIds() {<a name="line.186"></a> -<span class="sourceLineNo">187</span> this.chunkIdMap.clear();<a name="line.187"></a> -<span class="sourceLineNo">188</span> }<a name="line.188"></a> -<span class="sourceLineNo">189</span><a name="line.189"></a> -<span class="sourceLineNo">190</span> /**<a name="line.190"></a> -<span class="sourceLineNo">191</span> * A pool of {@link Chunk} instances.<a name="line.191"></a> -<span class="sourceLineNo">192</span> *<a name="line.192"></a> -<span class="sourceLineNo">193</span> * MemStoreChunkPool caches a number of retired chunks for reusing, it could<a name="line.193"></a> -<span class="sourceLineNo">194</span> * decrease allocating bytes when writing, thereby optimizing the garbage<a name="line.194"></a> -<span class="sourceLineNo">195</span> * collection on JVM.<a name="line.195"></a> -<span class="sourceLineNo">196</span> */<a name="line.196"></a> -<span class="sourceLineNo">197</span> private class MemStoreChunkPool implements HeapMemoryTuneObserver {<a name="line.197"></a> -<span class="sourceLineNo">198</span> private int maxCount;<a name="line.198"></a> -<span class="sourceLineNo">199</span><a name="line.199"></a> -<span class="sourceLineNo">200</span> // A queue of reclaimed chunks<a name="line.200"></a> -<span class="sourceLineNo">201</span> private final BlockingQueue<Chunk> reclaimedChunks;<a name="line.201"></a> -<span class="sourceLineNo">202</span> private final float poolSizePercentage;<a name="line.202"></a> -<span class="sourceLineNo">203</span><a name="line.203"></a> -<span class="sourceLineNo">204</span> /** Statistics thread schedule pool */<a name="line.204"></a> -<span class="sourceLineNo">205</span> private final ScheduledExecutorService scheduleThreadPool;<a name="line.205"></a> -<span class="sourceLineNo">206</span> /** Statistics thread */<a name="line.206"></a> -<span class="sourceLineNo">207</span> private static final int statThreadPeriod = 60 * 5;<a name="line.207"></a> -<span class="sourceLineNo">208</span> private final AtomicLong chunkCount = new AtomicLong();<a name="line.208"></a> -<span class="sourceLineNo">209</span> private final AtomicLong reusedChunkCount = new AtomicLong();<a name="line.209"></a> -<span class="sourceLineNo">210</span><a name="line.210"></a> -<span class="sourceLineNo">211</span> MemStoreChunkPool(int maxCount, int initialCount, float poolSizePercentage) {<a name="line.211"></a> -<span class="sourceLineNo">212</span> this.maxCount = maxCount;<a name="line.212"></a> -<span class="sourceLineNo">213</span> this.poolSizePercentage = poolSizePercentage;<a name="line.213"></a> -<span class="sourceLineNo">214</span> this.reclaimedChunks = new LinkedBlockingQueue<>();<a name="line.214"></a> -<span class="sourceLineNo">215</span> for (int i = 0; i < initialCount; i++) {<a name="line.215"></a> -<span class="sourceLineNo">216</span> Chunk chunk = createChunk(true);<a name="line.216"></a> -<span class="sourceLineNo">217</span> chunk.init();<a name="line.217"></a> -<span class="sourceLineNo">218</span> reclaimedChunks.add(chunk);<a name="line.218"></a> -<span class="sourceLineNo">219</span> }<a name="line.219"></a> -<span class="sourceLineNo">220</span> chunkCount.set(initialCount);<a name="line.220"></a> -<span class="sourceLineNo">221</span> final String n = Thread.currentThread().getName();<a name="line.221"></a> -<span class="sourceLineNo">222</span> scheduleThreadPool = Executors.newScheduledThreadPool(1, new ThreadFactoryBuilder()<a name="line.222"></a> -<span class="sourceLineNo">223</span> .setNameFormat(n + "-MemStoreChunkPool Statistics").setDaemon(true).build());<a name="line.223"></a> -<span class="sourceLineNo">224</span> this.scheduleThreadPool.scheduleAtFixedRate(new StatisticsThread(), statThreadPeriod,<a name="line.224"></a> -<span class="sourceLineNo">225</span> statThreadPeriod, TimeUnit.SECONDS);<a name="line.225"></a> -<span class="sourceLineNo">226</span> }<a name="line.226"></a> -<span class="sourceLineNo">227</span><a name="line.227"></a> -<span class="sourceLineNo">228</span> /**<a name="line.228"></a> -<span class="sourceLineNo">229</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.229"></a> -<span class="sourceLineNo">230</span> * not yet created max allowed chunks count. When we have already created max allowed chunks and<a name="line.230"></a> -<span class="sourceLineNo">231</span> * no free chunks as of now, return null. It is the responsibility of the caller to make a chunk<a name="line.231"></a> -<span class="sourceLineNo">232</span> * then.<a name="line.232"></a> -<span class="sourceLineNo">233</span> * Note: Chunks returned by this pool must be put back to the pool after its use.<a name="line.233"></a> -<span class="sourceLineNo">234</span> * @return a chunk<a name="line.234"></a> -<span class="sourceLineNo">235</span> * @see #putbackChunks(Set)<a name="line.235"></a> -<span class="sourceLineNo">236</span> */<a name="line.236"></a> -<span class="sourceLineNo">237</span> Chunk getChunk() {<a name="line.237"></a> -<span class="sourceLineNo">238</span> Chunk chunk = reclaimedChunks.poll();<a name="line.238"></a> -<span class="sourceLineNo">239</span> if (chunk != null) {<a name="line.239"></a> -<span class="sourceLineNo">240</span> chunk.reset();<a name="line.240"></a> -<span class="sourceLineNo">241</span> reusedChunkCount.incrementAndGet();<a name="line.241"></a> -<span class="sourceLineNo">242</span> } else {<a name="line.242"></a> -<span class="sourceLineNo">243</span> // Make a chunk iff we have not yet created the maxCount chunks<a name="line.243"></a> -<span class="sourceLineNo">244</span> while (true) {<a name="line.244"></a> -<span class="sourceLineNo">245</span> long created = this.chunkCount.get();<a name="line.245"></a> -<span class="sourceLineNo">246</span> if (created < this.maxCount) {<a name="line.246"></a> -<span class="sourceLineNo">247</span> if (this.chunkCount.compareAndSet(created, created + 1)) {<a name="line.247"></a> -<span class="sourceLineNo">248</span> chunk = createChunk(true);<a name="line.248"></a> -<span class="sourceLineNo">249</span> break;<a name="line.249"></a> -<span class="sourceLineNo">250</span> }<a name="line.250"></a> -<span class="sourceLineNo">251</span> } else {<a name="line.251"></a> -<span class="sourceLineNo">252</span> break;<a name="line.252"></a> -<span class="sourceLineNo">253</span> }<a name="line.253"></a> -<span class="sourceLineNo">254</span> }<a name="line.254"></a> -<span class="sourceLineNo">255</span> }<a name="line.255"></a> -<span class="sourceLineNo">256</span> return chunk;<a name="line.256"></a> -<span class="sourceLineNo">257</span> }<a name="line.257"></a> -<span class="sourceLineNo">258</span><a name="line.258"></a> -<span class="sourceLineNo">259</span> /**<a name="line.259"></a> -<span class="sourceLineNo">260</span> * Add the chunks to the pool, when the pool achieves the max size, it will skip the remaining<a name="line.260"></a> -<span class="sourceLineNo">261</span> * chunks<a name="line.261"></a> -<span class="sourceLineNo">262</span> * @param chunks<a name="line.262"></a> -<span class="sourceLineNo">263</span> */<a name="line.263"></a> -<span class="sourceLineNo">264</span> private void putbackChunks(Set<Integer> chunks) {<a name="line.264"></a> -<span class="sourceLineNo">265</span> int toAdd = Math.min(chunks.size(), this.maxCount - reclaimedChunks.size());<a name="line.265"></a> -<span class="sourceLineNo">266</span> Iterator<Integer> iterator = chunks.iterator();<a name="line.266"></a> -<span class="sourceLineNo">267</span> while (iterator.hasNext()) {<a name="line.267"></a> -<span class="sourceLineNo">268</span> Integer chunkId = iterator.next();<a name="line.268"></a> -<span class="sourceLineNo">269</span> // remove the chunks every time though they are from the pool or not<a name="line.269"></a> -<span class="sourceLineNo">270</span> Chunk chunk = ChunkCreator.this.removeChunk(chunkId);<a name="line.270"></a> -<span class="sourceLineNo">271</span> if (chunk != null) {<a name="line.271"></a> -<span class="sourceLineNo">272</span> if (chunk.isFromPool() && toAdd > 0) {<a name="line.272"></a> -<span class="sourceLineNo">273</span> reclaimedChunks.add(chunk);<a name="line.273"></a> -<span class="sourceLineNo">274</span> }<a name="line.274"></a> -<span class="sourceLineNo">275</span> toAdd--;<a name="line.275"></a> -<span class="sourceLineNo">276</span> }<a name="line.276"></a> -<span class="sourceLineNo">277</span> }<a name="line.277"></a> -<span class="sourceLineNo">278</span> }<a name="line.278"></a> -<span class="sourceLineNo">279</span><a name="line.279"></a> -<span class="sourceLineNo">280</span> private class StatisticsThread extends Thread {<a name="line.280"></a> -<span class="sourceLineNo">281</span> StatisticsThread() {<a name="line.281"></a> -<span class="sourceLineNo">282</span> super("MemStoreChunkPool.StatisticsThread");<a name="line.282"></a> -<span class="sourceLineNo">283</span> setDaemon(true);<a name="line.283"></a> -<span class="sourceLineNo">284</span> }<a name="line.284"></a> -<span class="sourceLineNo">285</span><a name="line.285"></a> -<span class="sourceLineNo">286</span> @Override<a name="line.286"></a> -<span class="sourceLineNo">287</span> public void run() {<a name="line.287"></a> -<span class="sourceLineNo">288</span> logStats();<a name="line.288"></a> -<span class="sourceLineNo">289</span> }<a name="line.289"></a> -<span class="sourceLineNo">290</span><a name="line.290"></a> -<span class="sourceLineNo">291</span> private void logStats() {<a name="line.291"></a> -<span class="sourceLineNo">292</span> if (!LOG.isDebugEnabled()) return;<a name="line.292"></a> -<span class="sourceLineNo">293</span> long created = chunkCount.get();<a name="line.293"></a> -<span class="sourceLineNo">294</span> long reused = reusedChunkCount.get();<a name="line.294"></a> -<span class="sourceLineNo">295</span> long total = created + reused;<a name="line.295"></a> -<span class="sourceLineNo">296</span> LOG.debug("Stats: current pool size=" + reclaimedChunks.size()<a name="line.296"></a> -<span class="sourceLineNo">297</span> + ",created chunk count=" + created<a name="line.297"></a> -<span class="sourceLineNo">298</span> + ",reused chunk count=" + reused<a name="line.298"></a> -<span class="sourceLineNo">299</span> + ",reuseRatio=" + (total == 0 ? "0" : StringUtils.formatPercent(<a name="line.299"></a> -<span class="sourceLineNo">300</span> (float) reused / (float) total, 2)));<a name="line.300"></a> -<span class="sourceLineNo">301</span> }<a name="line.301"></a> -<span class="sourceLineNo">302</span> }<a name="line.302"></a> -<span class="sourceLineNo">303</span><a name="line.303"></a> -<span class="sourceLineNo">304</span> private int getMaxCount() {<a name="line.304"></a> -<span class="sourceLineNo">305</span> return this.maxCount;<a name="line.305"></a> -<span class="sourceLineNo">306</span> }<a name="line.306"></a> -<span class="sourceLineNo">307</span><a name="line.307"></a> -<span class="sourceLineNo">308</span> @Override<a name="line.308"></a> -<span class="sourceLineNo">309</span> public void onHeapMemoryTune(long newMemstoreSize, long newBlockCacheSize) {<a name="line.309"></a> -<span class="sourceLineNo">310</span> // don't do any tuning in case of offheap memstore<a name="line.310"></a> -<span class="sourceLineNo">311</span> if (isOffheap()) {<a name="line.311"></a> -<span class="sourceLineNo">312</span> LOG.warn("Not tuning the chunk pool as it is offheap");<a name="line.312"></a> -<span class="sourceLineNo">313</span> return;<a name="line.313"></a> -<span class="sourceLineNo">314</span> }<a name="line.314"></a> -<span class="sourceLineNo">315</span> int newMaxCount =<a name="line.315"></a> -<span class="sourceLineNo">316</span> (int) (newMemstoreSize * poolSizePercentage / getChunkSize());<a name="line.316"></a> -<span class="sourceLineNo">317</span> if (newMaxCount != this.maxCount) {<a name="line.317"></a> -<span class="sourceLineNo">318</span> // We need an adjustment in the chunks numbers<a name="line.318"></a> -<span class="sourceLineNo">319</span> if (newMaxCount > this.maxCount) {<a name="line.319"></a> -<span class="sourceLineNo">320</span> // Max chunks getting increased. Just change the variable. Later calls to getChunk() would<a name="line.320"></a> -<span class="sourceLineNo">321</span> // create and add them to Q<a name="line.321"></a> -<span class="sourceLineNo">322</span> LOG.info("Max count for chunks increased from " + this.maxCount + " to " + newMaxCount);<a name="line.322"></a> -<span class="sourceLineNo">323</span> this.maxCount = newMaxCount;<a name="line.323"></a> -<span class="sourceLineNo">324</span> } else {<a name="line.324"></a> -<span class="sourceLineNo">325</span> // Max chunks getting decreased. We may need to clear off some of the pooled chunks now<a name="line.325"></a> -<span class="sourceLineNo">326</span> // itself. 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http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2fcc2ae0/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.html b/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.html deleted file mode 100644 index ffb6f14..0000000 --- a/devapidocs/src-html/org/apache/hadoop/hbase/regionserver/ChunkCreator.html +++ /dev/null @@ -1,476 +0,0 @@ -<!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>/**<a name="line.2"></a> -<span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> -<span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> -<span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> -<span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> -<span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> -<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> -<span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> -<span class="sourceLineNo">010</span> *<a name="line.10"></a> -<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> -<span class="sourceLineNo">012</span> *<a name="line.12"></a> -<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> -<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> -<span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> -<span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> -<span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> -<span class="sourceLineNo">018</span> */<a name="line.18"></a> -<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> -<span class="sourceLineNo">020</span><a name="line.20"></a> -<span class="sourceLineNo">021</span>import java.lang.ref.SoftReference;<a name="line.21"></a> -<span class="sourceLineNo">022</span>import java.util.Iterator;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import java.util.Set;<a name="line.24"></a> -<span class="sourceLineNo">025</span>import java.util.concurrent.BlockingQueue;<a name="line.25"></a> -<span class="sourceLineNo">026</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import java.util.concurrent.Executors;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import java.util.concurrent.LinkedBlockingQueue;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import java.util.concurrent.ScheduledExecutorService;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import java.util.concurrent.TimeUnit;<a name="line.30"></a> -<span class="sourceLineNo">031</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.32"></a> -<span class="sourceLineNo">033</span><a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.commons.logging.Log;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.commons.logging.LogFactory;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.regionserver.HeapMemoryManager.HeapMemoryTuneObserver;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import org.apache.hadoop.util.StringUtils;<a name="line.38"></a> -<span class="sourceLineNo">039</span><a name="line.39"></a> -<span class="sourceLineNo">040</span>import com.google.common.annotations.VisibleForTesting;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import com.google.common.util.concurrent.ThreadFactoryBuilder;<a name="line.41"></a> -<span class="sourceLineNo">042</span><a name="line.42"></a> -<span class="sourceLineNo">043</span>/**<a name="line.43"></a> -<span class="sourceLineNo">044</span> * Does the management of memstoreLAB chunk creations. A monotonically incrementing id is associated<a name="line.44"></a> -<span class="sourceLineNo">045</span> * with every chunk<a name="line.45"></a> -<span class="sourceLineNo">046</span> */<a name="line.46"></a> -<span class="sourceLineNo">047</span>@InterfaceAudience.Private<a name="line.47"></a> -<span class="sourceLineNo">048</span>public class ChunkCreator {<a name="line.48"></a> -<span class="sourceLineNo">049</span> private final Log LOG = LogFactory.getLog(ChunkCreator.class);<a name="line.49"></a> -<span class="sourceLineNo">050</span> // monotonically increasing chunkid<a name="line.50"></a> -<span class="sourceLineNo">051</span> private AtomicInteger chunkID = new AtomicInteger(1);<a name="line.51"></a> -<span class="sourceLineNo">052</span> // maps the chunk against the monotonically increasing chunk id. We need to preserve the<a name="line.52"></a> -<span class="sourceLineNo">053</span> // natural ordering of the key<a name="line.53"></a> -<span class="sourceLineNo">054</span> // CellChunkMap creation should convert the soft ref to hard reference<a name="line.54"></a> -<span class="sourceLineNo">055</span> private Map<Integer, SoftReference<Chunk>> chunkIdMap =<a name="line.55"></a> -<span class="sourceLineNo">056</span> new ConcurrentHashMap<Integer, SoftReference<Chunk>>();<a name="line.56"></a> -<span class="sourceLineNo">057</span> private final int chunkSize;<a name="line.57"></a> -<span class="sourceLineNo">058</span> private final boolean offheap;<a name="line.58"></a> -<span class="sourceLineNo">059</span> @VisibleForTesting<a name="line.59"></a> -<span class="sourceLineNo">060</span> static ChunkCreator INSTANCE;<a name="line.60"></a> -<span class="sourceLineNo">061</span> @VisibleForTesting<a name="line.61"></a> -<span class="sourceLineNo">062</span> static boolean chunkPoolDisabled = false;<a name="line.62"></a> -<span class="sourceLineNo">063</span> private MemStoreChunkPool pool;<a name="line.63"></a> -<span class="sourceLineNo">064</span><a name="line.64"></a> -<span class="sourceLineNo">065</span> @VisibleForTesting<a name="line.65"></a> -<span class="sourceLineNo">066</span> ChunkCreator(int chunkSize, boolean offheap, long globalMemStoreSize, float poolSizePercentage,<a name="line.66"></a> -<span class="sourceLineNo">067</span> float initialCountPercentage, HeapMemoryManager heapMemoryManager) {<a name="line.67"></a> -<span class="sourceLineNo">068</span> this.chunkSize = chunkSize;<a name="line.68"></a> -<span class="sourceLineNo">069</span> this.offheap = offheap;<a name="line.69"></a> -<span class="sourceLineNo">070</span> this.pool = initializePool(globalMemStoreSize, poolSizePercentage, initialCountPercentage);<a name="line.70"></a> -<span class="sourceLineNo">071</span> if (heapMemoryManager != null && this.pool != null) {<a name="line.71"></a> -<span class="sourceLineNo">072</span> // Register with Heap Memory manager<a name="line.72"></a> -<span class="sourceLineNo">073</span> heapMemoryManager.registerTuneObserver(this.pool);<a name="line.73"></a> -<span class="sourceLineNo">074</span> }<a name="line.74"></a> -<span class="sourceLineNo">075</span> }<a name="line.75"></a> -<span class="sourceLineNo">076</span><a name="line.76"></a> -<span class="sourceLineNo">077</span> /**<a name="line.77"></a> -<span class="sourceLineNo">078</span> * Initializes the instance of MSLABChunkCreator<a name="line.78"></a> -<span class="sourceLineNo">079</span> * @param chunkSize the chunkSize<a name="line.79"></a> -<span class="sourceLineNo">080</span> * @param offheap indicates if the chunk is to be created offheap or not<a name="line.80"></a> -<span class="sourceLineNo">081</span> * @param globalMemStoreSize the global memstore size<a name="line.81"></a> -<span class="sourceLineNo">082</span> * @param poolSizePercentage 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class="sourceLineNo">091</span> float poolSizePercentage, float initialCountPercentage, HeapMemoryManager heapMemoryManager) {<a name="line.91"></a> -<span class="sourceLineNo">092</span> if (INSTANCE != null) return INSTANCE;<a name="line.92"></a> -<span class="sourceLineNo">093</span> INSTANCE = new ChunkCreator(chunkSize, offheap, globalMemStoreSize, poolSizePercentage,<a name="line.93"></a> -<span class="sourceLineNo">094</span> initialCountPercentage, heapMemoryManager);<a name="line.94"></a> -<span class="sourceLineNo">095</span> return INSTANCE;<a name="line.95"></a> -<span class="sourceLineNo">096</span> }<a name="line.96"></a> -<span class="sourceLineNo">097</span><a name="line.97"></a> -<span class="sourceLineNo">098</span> static ChunkCreator getInstance() {<a name="line.98"></a> -<span class="sourceLineNo">099</span> return INSTANCE;<a name="line.99"></a> -<span class="sourceLineNo">100</span> }<a name="line.100"></a> -<span class="sourceLineNo">101</span><a name="line.101"></a> -<span class="sourceLineNo">102</span> /**<a name="line.102"></a> -<span class="sourceLineNo">103</span> * Creates and inits a chunk.<a name="line.103"></a> -<span class="sourceLineNo">104</span> * @return the chunk that was initialized<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 = null;<a name="line.107"></a> -<span class="sourceLineNo">108</span> if (pool != null) {<a name="line.108"></a> -<span class="sourceLineNo">109</span> // the pool creates the chunk internally. The chunk#init() call happens here<a name="line.109"></a> -<span class="sourceLineNo">110</span> chunk = this.pool.getChunk();<a name="line.110"></a> -<span class="sourceLineNo">111</span> // the pool has run out of maxCount<a name="line.111"></a> -<span class="sourceLineNo">112</span> if (chunk == null) {<a name="line.112"></a> -<span class="sourceLineNo">113</span> if (LOG.isTraceEnabled()) {<a name="line.113"></a> -<span class="sourceLineNo">114</span> LOG.trace("The chunk pool is full. Reached maxCount= " + this.pool.getMaxCount()<a name="line.114"></a> -<span class="sourceLineNo">115</span> + ". Creating chunk onheap.");<a name="line.115"></a> -<span class="sourceLineNo">116</span> }<a name="line.116"></a> -<span class="sourceLineNo">117</span> }<a name="line.117"></a> -<span class="sourceLineNo">118</span> }<a name="line.118"></a> -<span class="sourceLineNo">119</span> if (chunk == null) {<a name="line.119"></a> -<span class="sourceLineNo">120</span> chunk = createChunk();<a name="line.120"></a> -<span class="sourceLineNo">121</span> }<a name="line.121"></a> -<span class="sourceLineNo">122</span> // put this chunk into the chunkIdMap<a name="line.122"></a> -<span class="sourceLineNo">123</span> this.chunkIdMap.put(chunk.getId(), new SoftReference<>(chunk));<a name="line.123"></a> -<span class="sourceLineNo">124</span> // now we need to actually do the expensive memory allocation step in case of a new chunk,<a name="line.124"></a> -<span class="sourceLineNo">125</span> // else only the offset is set to the beginning of the chunk to accept allocations<a name="line.125"></a> -<span class="sourceLineNo">126</span> chunk.init();<a name="line.126"></a> -<span class="sourceLineNo">127</span> return chunk;<a name="line.127"></a> -<span class="sourceLineNo">128</span> }<a name="line.128"></a> -<span class="sourceLineNo">129</span><a name="line.129"></a> -<span class="sourceLineNo">130</span> private Chunk createChunk() {<a name="line.130"></a> -<span class="sourceLineNo">131</span> return createChunk(false);<a name="line.131"></a> -<span class="sourceLineNo">132</span> }<a name="line.132"></a> -<span class="sourceLineNo">133</span><a name="line.133"></a> -<span class="sourceLineNo">134</span> /**<a name="line.134"></a> -<span class="sourceLineNo">135</span> * Creates the chunk either onheap or offheap<a name="line.135"></a> -<span class="sourceLineNo">136</span> * @param pool indicates if the chunks have to be created which will be used by the Pool<a name="line.136"></a> -<span class="sourceLineNo">137</span> * @return the chunk<a name="line.137"></a> -<span 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name="line.149"></a> -<span class="sourceLineNo">150</span> @VisibleForTesting<a name="line.150"></a> -<span class="sourceLineNo">151</span> // TODO : To be used by CellChunkMap<a name="line.151"></a> -<span class="sourceLineNo">152</span> Chunk getChunk(int id) {<a name="line.152"></a> -<span class="sourceLineNo">153</span> SoftReference<Chunk> ref = chunkIdMap.get(id);<a name="line.153"></a> -<span class="sourceLineNo">154</span> if (ref != null) {<a name="line.154"></a> -<span class="sourceLineNo">155</span> return ref.get();<a name="line.155"></a> -<span class="sourceLineNo">156</span> }<a name="line.156"></a> -<span class="sourceLineNo">157</span> return null;<a name="line.157"></a> -<span class="sourceLineNo">158</span> }<a name="line.158"></a> -<span class="sourceLineNo">159</span><a name="line.159"></a> -<span class="sourceLineNo">160</span> int getChunkSize() {<a name="line.160"></a> -<span class="sourceLineNo">161</span> return this.chunkSize;<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> boolean isOffheap() {<a name="line.164"></a> -<span class="sourceLineNo">165</span> return this.offheap;<a name="line.165"></a> -<span class="sourceLineNo">166</span> }<a name="line.166"></a> -<span class="sourceLineNo">167</span><a name="line.167"></a> -<span class="sourceLineNo">168</span> private void removeChunks(Set<Integer> chunkIDs) {<a name="line.168"></a> -<span class="sourceLineNo">169</span> this.chunkIdMap.keySet().removeAll(chunkIDs);<a name="line.169"></a> -<span class="sourceLineNo">170</span> }<a name="line.170"></a> -<span class="sourceLineNo">171</span><a name="line.171"></a> -<span class="sourceLineNo">172</span> Chunk removeChunk(int chunkId) {<a name="line.172"></a> -<span class="sourceLineNo">173</span> SoftReference<Chunk> ref = this.chunkIdMap.remove(chunkId);<a name="line.173"></a> -<span class="sourceLineNo">174</span> if (ref != null) {<a name="line.174"></a> -<span class="sourceLineNo">175</span> return ref.get();<a name="line.175"></a> -<span class="sourceLineNo">176</span> }<a name="line.176"></a> -<span class="sourceLineNo">177</span> return null;<a name="line.177"></a> -<span class="sourceLineNo">178</span> }<a name="line.178"></a> -<span class="sourceLineNo">179</span><a name="line.179"></a> -<span class="sourceLineNo">180</span> @VisibleForTesting<a name="line.180"></a> -<span class="sourceLineNo">181</span> int size() {<a name="line.181"></a> -<span class="sourceLineNo">182</span> return this.chunkIdMap.size();<a name="line.182"></a> -<span class="sourceLineNo">183</span> }<a name="line.183"></a> -<span class="sourceLineNo">184</span><a name="line.184"></a> -<span class="sourceLineNo">185</span> @VisibleForTesting<a name="line.185"></a> -<span class="sourceLineNo">186</span> void clearChunkIds() {<a name="line.186"></a> -<span class="sourceLineNo">187</span> this.chunkIdMap.clear();<a name="line.187"></a> -<span class="sourceLineNo">188</span> }<a name="line.188"></a> -<span class="sourceLineNo">189</span><a name="line.189"></a> -<span class="sourceLineNo">190</span> /**<a name="line.190"></a> -<span class="sourceLineNo">191</span> * A pool of {@link Chunk} instances.<a name="line.191"></a> -<span class="sourceLineNo">192</span> *<a name="line.192"></a> -<span class="sourceLineNo">193</span> * MemStoreChunkPool caches a number of retired chunks for reusing, it could<a name="line.193"></a> -<span class="sourceLineNo">194</span> * decrease allocating bytes when writing, thereby optimizing the garbage<a name="line.194"></a> -<span class="sourceLineNo">195</span> * collection on JVM.<a name="line.195"></a> -<span class="sourceLineNo">196</span> */<a name="line.196"></a> -<span class="sourceLineNo">197</span> private class MemStoreChunkPool implements HeapMemoryTuneObserver {<a name="line.197"></a> -<span class="sourceLineNo">198</span> private int maxCount;<a name="line.198"></a> -<span class="sourceLineNo">199</span><a name="line.199"></a> -<span class="sourceLineNo">200</span> // A queue of reclaimed chunks<a name="line.200"></a> -<span class="sourceLineNo">201</span> private final BlockingQueue<Chunk> reclaimedChunks;<a name="line.201"></a> -<span class="sourceLineNo">202</span> private final float poolSizePercentage;<a name="line.202"></a> -<span class="sourceLineNo">203</span><a name="line.203"></a> -<span class="sourceLineNo">204</span> /** Statistics thread schedule pool */<a name="line.204"></a> -<span class="sourceLineNo">205</span> private final ScheduledExecutorService scheduleThreadPool;<a name="line.205"></a> -<span class="sourceLineNo">206</span> /** Statistics thread */<a name="line.206"></a> -<span class="sourceLineNo">207</span> private static final int statThreadPeriod = 60 * 5;<a name="line.207"></a> -<span class="sourceLineNo">208</span> private final AtomicLong chunkCount = new AtomicLong();<a name="line.208"></a> -<span class="sourceLineNo">209</span> private final AtomicLong reusedChunkCount = new AtomicLong();<a name="line.209"></a> -<span class="sourceLineNo">210</span><a name="line.210"></a> -<span class="sourceLineNo">211</span> MemStoreChunkPool(int maxCount, int initialCount, float poolSizePercentage) {<a name="line.211"></a> -<span class="sourceLineNo">212</span> this.maxCount = maxCount;<a name="line.212"></a> -<span class="sourceLineNo">213</span> this.poolSizePercentage = poolSizePercentage;<a name="line.213"></a> -<span class="sourceLineNo">214</span> this.reclaimedChunks = new LinkedBlockingQueue<>();<a name="line.214"></a> -<span class="sourceLineNo">215</span> for (int i = 0; i < initialCount; i++) {<a name="line.215"></a> -<span class="sourceLineNo">216</span> Chunk chunk = createChunk(true);<a name="line.216"></a> -<span class="sourceLineNo">217</span> chunk.init();<a name="line.217"></a> -<span class="sourceLineNo">218</span> reclaimedChunks.add(chunk);<a 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name="line.228"></a> -<span class="sourceLineNo">229</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.229"></a> -<span class="sourceLineNo">230</span> * not yet created max allowed chunks count. When we have already created max allowed chunks and<a name="line.230"></a> -<span class="sourceLineNo">231</span> * no free chunks as of now, return null. It is the responsibility of the caller to make a chunk<a name="line.231"></a> -<span class="sourceLineNo">232</span> * then.<a name="line.232"></a> -<span class="sourceLineNo">233</span> * Note: Chunks returned by this pool must be put back to the pool after its use.<a name="line.233"></a> -<span class="sourceLineNo">234</span> * @return a chunk<a name="line.234"></a> -<span class="sourceLineNo">235</span> * @see #putbackChunks(Set)<a name="line.235"></a> -<span class="sourceLineNo">236</span> */<a name="line.236"></a> -<span class="sourceLineNo">237</span> Chunk getChunk() {<a name="line.237"></a> -<span class="sourceLineNo">238</span> Chunk chunk = reclaimedChunks.poll();<a name="line.238"></a> -<span class="sourceLineNo">239</span> if (chunk != null) {<a name="line.239"></a> -<span class="sourceLineNo">240</span> chunk.reset();<a name="line.240"></a> -<span class="sourceLineNo">241</span> reusedChunkCount.incrementAndGet();<a name="line.241"></a> -<span class="sourceLineNo">242</span> } else {<a name="line.242"></a> -<span class="sourceLineNo">243</span> // Make a chunk iff we have not yet created the maxCount chunks<a name="line.243"></a> -<span class="sourceLineNo">244</span> while (true) {<a name="line.244"></a> -<span class="sourceLineNo">245</span> long created = this.chunkCount.get();<a name="line.245"></a> -<span class="sourceLineNo">246</span> if (created < this.maxCount) {<a name="line.246"></a> -<span class="sourceLineNo">247</span> if (this.chunkCount.compareAndSet(created, created + 1)) {<a name="line.247"></a> -<span class="sourceLineNo">248</span> chunk = createChunk(true);<a name="line.248"></a> -<span class="sourceLineNo">249</span> break;<a name="line.249"></a> -<span class="sourceLineNo">250</span> }<a name="line.250"></a> -<span class="sourceLineNo">251</span> } else {<a name="line.251"></a> -<span class="sourceLineNo">252</span> break;<a name="line.252"></a> -<span class="sourceLineNo">253</span> }<a name="line.253"></a> -<span class="sourceLineNo">254</span> }<a name="line.254"></a> -<span class="sourceLineNo">255</span> }<a name="line.255"></a> -<span class="sourceLineNo">256</span> return chunk;<a name="line.256"></a> -<span class="sourceLineNo">257</span> }<a name="line.257"></a> -<span class="sourceLineNo">258</span><a name="line.258"></a> -<span class="sourceLineNo">259</span> /**<a name="line.259"></a> -<span class="sourceLineNo">260</span> * Add the chunks to the pool, when the pool achieves the max size, it will skip the remaining<a name="line.260"></a> -<span class="sourceLineNo">261</span> * chunks<a name="line.261"></a> -<span class="sourceLineNo">262</span> * @param chunks<a name="line.262"></a> -<span class="sourceLineNo">263</span> */<a name="line.263"></a> -<span class="sourceLineNo">264</span> private void putbackChunks(Set<Integer> chunks) {<a name="line.264"></a> -<span class="sourceLineNo">265</span> int toAdd = Math.min(chunks.size(), this.maxCount - 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