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From git-site-r...@apache.org
Subject [09/51] [partial] hbase-site git commit: Published site at .
Date Sun, 12 Nov 2017 15:17:01 GMT
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/abb69192/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html
index b9ac0db..eb74b5b 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.html
@@ -6,302 +6,303 @@
 </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><a name="line.19"></a>
-<span class="sourceLineNo">020</span>package org.apache.hadoop.hbase.io.hfile;<a name="line.20"></a>
-<span class="sourceLineNo">021</span><a name="line.21"></a>
-<span class="sourceLineNo">022</span>import net.spy.memcached.CachedData;<a name="line.22"></a>
-<span class="sourceLineNo">023</span>import net.spy.memcached.ConnectionFactoryBuilder;<a name="line.23"></a>
-<span class="sourceLineNo">024</span>import net.spy.memcached.FailureMode;<a name="line.24"></a>
-<span class="sourceLineNo">025</span>import net.spy.memcached.MemcachedClient;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import net.spy.memcached.transcoders.Transcoder;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import org.apache.commons.logging.Log;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import org.apache.commons.logging.LogFactory;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.conf.Configuration;<a name="line.29"></a>
-<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.HConstants;<a name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.32"></a>
-<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.htrace.Trace;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.htrace.TraceScope;<a name="line.37"></a>
-<span class="sourceLineNo">038</span><a name="line.38"></a>
-<span class="sourceLineNo">039</span><a name="line.39"></a>
-<span class="sourceLineNo">040</span>import java.io.IOException;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import java.net.InetSocketAddress;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import java.nio.ByteBuffer;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import java.util.ArrayList;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import java.util.Iterator;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import java.util.List;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import java.util.NoSuchElementException;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import java.util.concurrent.ExecutionException;<a name="line.47"></a>
-<span class="sourceLineNo">048</span><a name="line.48"></a>
-<span class="sourceLineNo">049</span>/**<a name="line.49"></a>
-<span class="sourceLineNo">050</span> * Class to store blocks into memcached.<a name="line.50"></a>
-<span class="sourceLineNo">051</span> * This should only be used on a cluster of Memcached daemons that are tuned well and have a<a name="line.51"></a>
-<span class="sourceLineNo">052</span> * good network connection to the HBase regionservers. Any other use will likely slow down HBase<a name="line.52"></a>
-<span class="sourceLineNo">053</span> * greatly.<a name="line.53"></a>
-<span class="sourceLineNo">054</span> */<a name="line.54"></a>
-<span class="sourceLineNo">055</span>@InterfaceAudience.Private<a name="line.55"></a>
-<span class="sourceLineNo">056</span>public class MemcachedBlockCache implements BlockCache {<a name="line.56"></a>
-<span class="sourceLineNo">057</span>  private static final Log LOG = LogFactory.getLog(MemcachedBlockCache.class.getName());<a name="line.57"></a>
-<span class="sourceLineNo">058</span><a name="line.58"></a>
-<span class="sourceLineNo">059</span>  // Some memcache versions won't take more than 1024 * 1024. So set the limit below<a name="line.59"></a>
-<span class="sourceLineNo">060</span>  // that just in case this client is used with those versions.<a name="line.60"></a>
-<span class="sourceLineNo">061</span>  public static final int MAX_SIZE = 1020 * 1024;<a name="line.61"></a>
-<span class="sourceLineNo">062</span><a name="line.62"></a>
-<span class="sourceLineNo">063</span>  // Config key for what memcached servers to use.<a name="line.63"></a>
-<span class="sourceLineNo">064</span>  // They should be specified in a comma sperated list with ports.<a name="line.64"></a>
-<span class="sourceLineNo">065</span>  // like:<a name="line.65"></a>
-<span class="sourceLineNo">066</span>  //<a name="line.66"></a>
-<span class="sourceLineNo">067</span>  // host1:11211,host3:8080,host4:11211<a name="line.67"></a>
-<span class="sourceLineNo">068</span>  public static final String MEMCACHED_CONFIG_KEY = "hbase.cache.memcached.servers";<a name="line.68"></a>
-<span class="sourceLineNo">069</span>  public static final String MEMCACHED_TIMEOUT_KEY = "hbase.cache.memcached.timeout";<a name="line.69"></a>
-<span class="sourceLineNo">070</span>  public static final String MEMCACHED_OPTIMEOUT_KEY = "hbase.cache.memcached.optimeout";<a name="line.70"></a>
-<span class="sourceLineNo">071</span>  public static final String MEMCACHED_OPTIMIZE_KEY = "hbase.cache.memcached.spy.optimze";<a name="line.71"></a>
-<span class="sourceLineNo">072</span>  public static final long MEMCACHED_DEFAULT_TIMEOUT = 500;<a name="line.72"></a>
-<span class="sourceLineNo">073</span>  public static final boolean MEMCACHED_OPTIMIZE_DEFAULT = false;<a name="line.73"></a>
-<span class="sourceLineNo">074</span><a name="line.74"></a>
-<span class="sourceLineNo">075</span>  private final MemcachedClient client;<a name="line.75"></a>
-<span class="sourceLineNo">076</span>  private final HFileBlockTranscoder tc = new HFileBlockTranscoder();<a name="line.76"></a>
-<span class="sourceLineNo">077</span>  private final CacheStats cacheStats = new CacheStats("MemcachedBlockCache");<a name="line.77"></a>
-<span class="sourceLineNo">078</span><a name="line.78"></a>
-<span class="sourceLineNo">079</span>  public MemcachedBlockCache(Configuration c) throws IOException {<a name="line.79"></a>
-<span class="sourceLineNo">080</span>    LOG.info("Creating MemcachedBlockCache");<a name="line.80"></a>
-<span class="sourceLineNo">081</span><a name="line.81"></a>
-<span class="sourceLineNo">082</span>    long opTimeout = c.getLong(MEMCACHED_OPTIMEOUT_KEY, MEMCACHED_DEFAULT_TIMEOUT);<a name="line.82"></a>
-<span class="sourceLineNo">083</span>    long queueTimeout = c.getLong(MEMCACHED_TIMEOUT_KEY, opTimeout + MEMCACHED_DEFAULT_TIMEOUT);<a name="line.83"></a>
-<span class="sourceLineNo">084</span>    boolean optimize = c.getBoolean(MEMCACHED_OPTIMIZE_KEY, MEMCACHED_OPTIMIZE_DEFAULT);<a name="line.84"></a>
-<span class="sourceLineNo">085</span><a name="line.85"></a>
-<span class="sourceLineNo">086</span>    ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder()<a name="line.86"></a>
-<span class="sourceLineNo">087</span>        .setOpTimeout(opTimeout)<a name="line.87"></a>
-<span class="sourceLineNo">088</span>        .setOpQueueMaxBlockTime(queueTimeout) // Cap the max time before anything times out<a name="line.88"></a>
-<span class="sourceLineNo">089</span>        .setFailureMode(FailureMode.Redistribute)<a name="line.89"></a>
-<span class="sourceLineNo">090</span>        .setShouldOptimize(optimize)<a name="line.90"></a>
-<span class="sourceLineNo">091</span>        .setDaemon(true)                      // Don't keep threads around past the end of days.<a name="line.91"></a>
-<span class="sourceLineNo">092</span>        .setUseNagleAlgorithm(false)          // Ain't nobody got time for that<a name="line.92"></a>
-<span class="sourceLineNo">093</span>        .setReadBufferSize(HConstants.DEFAULT_BLOCKSIZE * 4 * 1024); // Much larger just in case<a name="line.93"></a>
-<span class="sourceLineNo">094</span><a name="line.94"></a>
-<span class="sourceLineNo">095</span>    // Assume only the localhost is serving memecached.<a name="line.95"></a>
-<span class="sourceLineNo">096</span>    // A la mcrouter or co-locating memcached with split regionservers.<a name="line.96"></a>
-<span class="sourceLineNo">097</span>    //<a name="line.97"></a>
-<span class="sourceLineNo">098</span>    // If this config is a pool of memecached servers they will all be used according to the<a name="line.98"></a>
-<span class="sourceLineNo">099</span>    // default hashing scheme defined by the memcache client. Spy Memecache client in this<a name="line.99"></a>
-<span class="sourceLineNo">100</span>    // case.<a name="line.100"></a>
-<span class="sourceLineNo">101</span>    String serverListString = c.get(MEMCACHED_CONFIG_KEY,"localhost:11211");<a name="line.101"></a>
-<span class="sourceLineNo">102</span>    String[] servers = serverListString.split(",");<a name="line.102"></a>
-<span class="sourceLineNo">103</span>    List&lt;InetSocketAddress&gt; serverAddresses = new ArrayList&lt;&gt;(servers.length);<a name="line.103"></a>
-<span class="sourceLineNo">104</span>    for (String s:servers) {<a name="line.104"></a>
-<span class="sourceLineNo">105</span>      serverAddresses.add(Addressing.createInetSocketAddressFromHostAndPortStr(s));<a name="line.105"></a>
-<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
-<span class="sourceLineNo">107</span><a name="line.107"></a>
-<span class="sourceLineNo">108</span>    client = new MemcachedClient(builder.build(), serverAddresses);<a name="line.108"></a>
-<span class="sourceLineNo">109</span>  }<a name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span>  @Override<a name="line.111"></a>
-<span class="sourceLineNo">112</span>  public void cacheBlock(BlockCacheKey cacheKey,<a name="line.112"></a>
-<span class="sourceLineNo">113</span>                         Cacheable buf,<a name="line.113"></a>
-<span class="sourceLineNo">114</span>                         boolean inMemory,<a name="line.114"></a>
-<span class="sourceLineNo">115</span>                         boolean cacheDataInL1) {<a name="line.115"></a>
-<span class="sourceLineNo">116</span>    cacheBlock(cacheKey, buf);<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>  @Override<a name="line.119"></a>
-<span class="sourceLineNo">120</span>  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {<a name="line.120"></a>
-<span class="sourceLineNo">121</span>    if (buf instanceof HFileBlock) {<a name="line.121"></a>
-<span class="sourceLineNo">122</span>      client.add(cacheKey.toString(), MAX_SIZE, (HFileBlock) buf, tc);<a name="line.122"></a>
-<span class="sourceLineNo">123</span>    } else {<a name="line.123"></a>
-<span class="sourceLineNo">124</span>      if (LOG.isDebugEnabled()) {<a name="line.124"></a>
-<span class="sourceLineNo">125</span>        LOG.debug("MemcachedBlockCache can not cache Cacheable's of type "<a name="line.125"></a>
-<span class="sourceLineNo">126</span>            + buf.getClass().toString());<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>  }<a name="line.129"></a>
-<span class="sourceLineNo">130</span><a name="line.130"></a>
-<span class="sourceLineNo">131</span>  @Override<a name="line.131"></a>
-<span class="sourceLineNo">132</span>  public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,<a name="line.132"></a>
-<span class="sourceLineNo">133</span>                            boolean repeat, boolean updateCacheMetrics) {<a name="line.133"></a>
-<span class="sourceLineNo">134</span>    // Assume that nothing is the block cache<a name="line.134"></a>
-<span class="sourceLineNo">135</span>    HFileBlock result = null;<a name="line.135"></a>
-<span class="sourceLineNo">136</span><a name="line.136"></a>
-<span class="sourceLineNo">137</span>    try (TraceScope traceScope = Trace.startSpan("MemcachedBlockCache.getBlock")) {<a name="line.137"></a>
-<span class="sourceLineNo">138</span>      result = client.get(cacheKey.toString(), tc);<a name="line.138"></a>
-<span class="sourceLineNo">139</span>    } catch (Exception e) {<a name="line.139"></a>
-<span class="sourceLineNo">140</span>      // Catch a pretty broad set of exceptions to limit any changes in the memecache client<a name="line.140"></a>
-<span class="sourceLineNo">141</span>      // and how it handles failures from leaking into the read path.<a name="line.141"></a>
-<span class="sourceLineNo">142</span>      if (LOG.isDebugEnabled()) {<a name="line.142"></a>
-<span class="sourceLineNo">143</span>        LOG.debug("Exception pulling from memcached [ "<a name="line.143"></a>
-<span class="sourceLineNo">144</span>            + cacheKey.toString()<a name="line.144"></a>
-<span class="sourceLineNo">145</span>            + " ]. Treating as a miss.", e);<a name="line.145"></a>
-<span class="sourceLineNo">146</span>      }<a name="line.146"></a>
-<span class="sourceLineNo">147</span>      result = null;<a name="line.147"></a>
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-<span class="sourceLineNo">149</span>      // Update stats if this request doesn't have it turned off 100% of the time<a name="line.149"></a>
-<span class="sourceLineNo">150</span>      if (updateCacheMetrics) {<a name="line.150"></a>
-<span class="sourceLineNo">151</span>        if (result == null) {<a name="line.151"></a>
-<span class="sourceLineNo">152</span>          cacheStats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.152"></a>
-<span class="sourceLineNo">153</span>        } else {<a name="line.153"></a>
-<span class="sourceLineNo">154</span>          cacheStats.hit(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.154"></a>
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-<span class="sourceLineNo">165</span>      cacheStats.evict();<a name="line.165"></a>
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-<span class="sourceLineNo">168</span>      LOG.warn("Error deleting " + cacheKey.toString(), e);<a name="line.168"></a>
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-<span class="sourceLineNo">296</span>}<a name="line.296"></a>
+<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> * Copyright The Apache Software Foundation<a name="line.3"></a>
+<span class="sourceLineNo">004</span> *<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * work for additional information regarding copyright ownership. The ASF<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.8"></a>
+<span class="sourceLineNo">009</span> * "License"); you may not use this file except in compliance with the License.<a name="line.9"></a>
+<span class="sourceLineNo">010</span> * You may obtain a copy of the License at<a name="line.10"></a>
+<span class="sourceLineNo">011</span> *<a name="line.11"></a>
+<span class="sourceLineNo">012</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.12"></a>
+<span class="sourceLineNo">013</span> *<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * Unless required by applicable law or agreed to in writing, software<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.16"></a>
+<span class="sourceLineNo">017</span> * License for the specific language governing permissions and limitations<a name="line.17"></a>
+<span class="sourceLineNo">018</span> * under the License.<a name="line.18"></a>
+<span class="sourceLineNo">019</span> */<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>package org.apache.hadoop.hbase.io.hfile;<a name="line.21"></a>
+<span class="sourceLineNo">022</span><a name="line.22"></a>
+<span class="sourceLineNo">023</span>import java.io.IOException;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import java.net.InetSocketAddress;<a name="line.24"></a>
+<span class="sourceLineNo">025</span>import java.nio.ByteBuffer;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import java.util.ArrayList;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import java.util.Iterator;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import java.util.NoSuchElementException;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import java.util.concurrent.ExecutionException;<a name="line.30"></a>
+<span class="sourceLineNo">031</span><a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.commons.logging.Log;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.commons.logging.LogFactory;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.conf.Configuration;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.HConstants;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.36"></a>
+<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.37"></a>
+<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.38"></a>
+<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.trace.TraceUtil;<a name="line.39"></a>
+<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.40"></a>
+<span class="sourceLineNo">041</span>import org.apache.htrace.core.TraceScope;<a name="line.41"></a>
+<span class="sourceLineNo">042</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.42"></a>
+<span class="sourceLineNo">043</span><a name="line.43"></a>
+<span class="sourceLineNo">044</span>import net.spy.memcached.CachedData;<a name="line.44"></a>
+<span class="sourceLineNo">045</span>import net.spy.memcached.ConnectionFactoryBuilder;<a name="line.45"></a>
+<span class="sourceLineNo">046</span>import net.spy.memcached.FailureMode;<a name="line.46"></a>
+<span class="sourceLineNo">047</span>import net.spy.memcached.MemcachedClient;<a name="line.47"></a>
+<span class="sourceLineNo">048</span>import net.spy.memcached.transcoders.Transcoder;<a name="line.48"></a>
+<span class="sourceLineNo">049</span><a name="line.49"></a>
+<span class="sourceLineNo">050</span>/**<a name="line.50"></a>
+<span class="sourceLineNo">051</span> * Class to store blocks into memcached.<a name="line.51"></a>
+<span class="sourceLineNo">052</span> * This should only be used on a cluster of Memcached daemons that are tuned well and have a<a name="line.52"></a>
+<span class="sourceLineNo">053</span> * good network connection to the HBase regionservers. Any other use will likely slow down HBase<a name="line.53"></a>
+<span class="sourceLineNo">054</span> * greatly.<a name="line.54"></a>
+<span class="sourceLineNo">055</span> */<a name="line.55"></a>
+<span class="sourceLineNo">056</span>@InterfaceAudience.Private<a name="line.56"></a>
+<span class="sourceLineNo">057</span>public class MemcachedBlockCache implements BlockCache {<a name="line.57"></a>
+<span class="sourceLineNo">058</span>  private static final Log LOG = LogFactory.getLog(MemcachedBlockCache.class.getName());<a name="line.58"></a>
+<span class="sourceLineNo">059</span><a name="line.59"></a>
+<span class="sourceLineNo">060</span>  // Some memcache versions won't take more than 1024 * 1024. So set the limit below<a name="line.60"></a>
+<span class="sourceLineNo">061</span>  // that just in case this client is used with those versions.<a name="line.61"></a>
+<span class="sourceLineNo">062</span>  public static final int MAX_SIZE = 1020 * 1024;<a name="line.62"></a>
+<span class="sourceLineNo">063</span><a name="line.63"></a>
+<span class="sourceLineNo">064</span>  // Config key for what memcached servers to use.<a name="line.64"></a>
+<span class="sourceLineNo">065</span>  // They should be specified in a comma sperated list with ports.<a name="line.65"></a>
+<span class="sourceLineNo">066</span>  // like:<a name="line.66"></a>
+<span class="sourceLineNo">067</span>  //<a name="line.67"></a>
+<span class="sourceLineNo">068</span>  // host1:11211,host3:8080,host4:11211<a name="line.68"></a>
+<span class="sourceLineNo">069</span>  public static final String MEMCACHED_CONFIG_KEY = "hbase.cache.memcached.servers";<a name="line.69"></a>
+<span class="sourceLineNo">070</span>  public static final String MEMCACHED_TIMEOUT_KEY = "hbase.cache.memcached.timeout";<a name="line.70"></a>
+<span class="sourceLineNo">071</span>  public static final String MEMCACHED_OPTIMEOUT_KEY = "hbase.cache.memcached.optimeout";<a name="line.71"></a>
+<span class="sourceLineNo">072</span>  public static final String MEMCACHED_OPTIMIZE_KEY = "hbase.cache.memcached.spy.optimze";<a name="line.72"></a>
+<span class="sourceLineNo">073</span>  public static final long MEMCACHED_DEFAULT_TIMEOUT = 500;<a name="line.73"></a>
+<span class="sourceLineNo">074</span>  public static final boolean MEMCACHED_OPTIMIZE_DEFAULT = false;<a name="line.74"></a>
+<span class="sourceLineNo">075</span><a name="line.75"></a>
+<span class="sourceLineNo">076</span>  private final MemcachedClient client;<a name="line.76"></a>
+<span class="sourceLineNo">077</span>  private final HFileBlockTranscoder tc = new HFileBlockTranscoder();<a name="line.77"></a>
+<span class="sourceLineNo">078</span>  private final CacheStats cacheStats = new CacheStats("MemcachedBlockCache");<a name="line.78"></a>
+<span class="sourceLineNo">079</span><a name="line.79"></a>
+<span class="sourceLineNo">080</span>  public MemcachedBlockCache(Configuration c) throws IOException {<a name="line.80"></a>
+<span class="sourceLineNo">081</span>    LOG.info("Creating MemcachedBlockCache");<a name="line.81"></a>
+<span class="sourceLineNo">082</span><a name="line.82"></a>
+<span class="sourceLineNo">083</span>    long opTimeout = c.getLong(MEMCACHED_OPTIMEOUT_KEY, MEMCACHED_DEFAULT_TIMEOUT);<a name="line.83"></a>
+<span class="sourceLineNo">084</span>    long queueTimeout = c.getLong(MEMCACHED_TIMEOUT_KEY, opTimeout + MEMCACHED_DEFAULT_TIMEOUT);<a name="line.84"></a>
+<span class="sourceLineNo">085</span>    boolean optimize = c.getBoolean(MEMCACHED_OPTIMIZE_KEY, MEMCACHED_OPTIMIZE_DEFAULT);<a name="line.85"></a>
+<span class="sourceLineNo">086</span><a name="line.86"></a>
+<span class="sourceLineNo">087</span>    ConnectionFactoryBuilder builder = new ConnectionFactoryBuilder()<a name="line.87"></a>
+<span class="sourceLineNo">088</span>        .setOpTimeout(opTimeout)<a name="line.88"></a>
+<span class="sourceLineNo">089</span>        .setOpQueueMaxBlockTime(queueTimeout) // Cap the max time before anything times out<a name="line.89"></a>
+<span class="sourceLineNo">090</span>        .setFailureMode(FailureMode.Redistribute)<a name="line.90"></a>
+<span class="sourceLineNo">091</span>        .setShouldOptimize(optimize)<a name="line.91"></a>
+<span class="sourceLineNo">092</span>        .setDaemon(true)                      // Don't keep threads around past the end of days.<a name="line.92"></a>
+<span class="sourceLineNo">093</span>        .setUseNagleAlgorithm(false)          // Ain't nobody got time for that<a name="line.93"></a>
+<span class="sourceLineNo">094</span>        .setReadBufferSize(HConstants.DEFAULT_BLOCKSIZE * 4 * 1024); // Much larger just in case<a name="line.94"></a>
+<span class="sourceLineNo">095</span><a name="line.95"></a>
+<span class="sourceLineNo">096</span>    // Assume only the localhost is serving memecached.<a name="line.96"></a>
+<span class="sourceLineNo">097</span>    // A la mcrouter or co-locating memcached with split regionservers.<a name="line.97"></a>
+<span class="sourceLineNo">098</span>    //<a name="line.98"></a>
+<span class="sourceLineNo">099</span>    // If this config is a pool of memecached servers they will all be used according to the<a name="line.99"></a>
+<span class="sourceLineNo">100</span>    // default hashing scheme defined by the memcache client. Spy Memecache client in this<a name="line.100"></a>
+<span class="sourceLineNo">101</span>    // case.<a name="line.101"></a>
+<span class="sourceLineNo">102</span>    String serverListString = c.get(MEMCACHED_CONFIG_KEY,"localhost:11211");<a name="line.102"></a>
+<span class="sourceLineNo">103</span>    String[] servers = serverListString.split(",");<a name="line.103"></a>
+<span class="sourceLineNo">104</span>    List&lt;InetSocketAddress&gt; serverAddresses = new ArrayList&lt;&gt;(servers.length);<a name="line.104"></a>
+<span class="sourceLineNo">105</span>    for (String s:servers) {<a name="line.105"></a>
+<span class="sourceLineNo">106</span>      serverAddresses.add(Addressing.createInetSocketAddressFromHostAndPortStr(s));<a name="line.106"></a>
+<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
+<span class="sourceLineNo">108</span><a name="line.108"></a>
+<span class="sourceLineNo">109</span>    client = new MemcachedClient(builder.build(), serverAddresses);<a name="line.109"></a>
+<span class="sourceLineNo">110</span>  }<a name="line.110"></a>
+<span class="sourceLineNo">111</span><a name="line.111"></a>
+<span class="sourceLineNo">112</span>  @Override<a name="line.112"></a>
+<span class="sourceLineNo">113</span>  public void cacheBlock(BlockCacheKey cacheKey,<a name="line.113"></a>
+<span class="sourceLineNo">114</span>                         Cacheable buf,<a name="line.114"></a>
+<span class="sourceLineNo">115</span>                         boolean inMemory,<a name="line.115"></a>
+<span class="sourceLineNo">116</span>                         boolean cacheDataInL1) {<a name="line.116"></a>
+<span class="sourceLineNo">117</span>    cacheBlock(cacheKey, buf);<a name="line.117"></a>
+<span class="sourceLineNo">118</span>  }<a name="line.118"></a>
+<span class="sourceLineNo">119</span><a name="line.119"></a>
+<span class="sourceLineNo">120</span>  @Override<a name="line.120"></a>
+<span class="sourceLineNo">121</span>  public void cacheBlock(BlockCacheKey cacheKey, Cacheable buf) {<a name="line.121"></a>
+<span class="sourceLineNo">122</span>    if (buf instanceof HFileBlock) {<a name="line.122"></a>
+<span class="sourceLineNo">123</span>      client.add(cacheKey.toString(), MAX_SIZE, (HFileBlock) buf, tc);<a name="line.123"></a>
+<span class="sourceLineNo">124</span>    } else {<a name="line.124"></a>
+<span class="sourceLineNo">125</span>      if (LOG.isDebugEnabled()) {<a name="line.125"></a>
+<span class="sourceLineNo">126</span>        LOG.debug("MemcachedBlockCache can not cache Cacheable's of type "<a name="line.126"></a>
+<span class="sourceLineNo">127</span>            + buf.getClass().toString());<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>  }<a name="line.130"></a>
+<span class="sourceLineNo">131</span><a name="line.131"></a>
+<span class="sourceLineNo">132</span>  @Override<a name="line.132"></a>
+<span class="sourceLineNo">133</span>  public Cacheable getBlock(BlockCacheKey cacheKey, boolean caching,<a name="line.133"></a>
+<span class="sourceLineNo">134</span>                            boolean repeat, boolean updateCacheMetrics) {<a name="line.134"></a>
+<span class="sourceLineNo">135</span>    // Assume that nothing is the block cache<a name="line.135"></a>
+<span class="sourceLineNo">136</span>    HFileBlock result = null;<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span>    try (TraceScope traceScope = TraceUtil.createTrace("MemcachedBlockCache.getBlock")) {<a name="line.138"></a>
+<span class="sourceLineNo">139</span>      result = client.get(cacheKey.toString(), tc);<a name="line.139"></a>
+<span class="sourceLineNo">140</span>    } catch (Exception e) {<a name="line.140"></a>
+<span class="sourceLineNo">141</span>      // Catch a pretty broad set of exceptions to limit any changes in the memecache client<a name="line.141"></a>
+<span class="sourceLineNo">142</span>      // and how it handles failures from leaking into the read path.<a name="line.142"></a>
+<span class="sourceLineNo">143</span>      if (LOG.isDebugEnabled()) {<a name="line.143"></a>
+<span class="sourceLineNo">144</span>        LOG.debug("Exception pulling from memcached [ "<a name="line.144"></a>
+<span class="sourceLineNo">145</span>            + cacheKey.toString()<a name="line.145"></a>
+<span class="sourceLineNo">146</span>            + " ]. Treating as a miss.", e);<a name="line.146"></a>
+<span class="sourceLineNo">147</span>      }<a name="line.147"></a>
+<span class="sourceLineNo">148</span>      result = null;<a name="line.148"></a>
+<span class="sourceLineNo">149</span>    } finally {<a name="line.149"></a>
+<span class="sourceLineNo">150</span>      // Update stats if this request doesn't have it turned off 100% of the time<a name="line.150"></a>
+<span class="sourceLineNo">151</span>      if (updateCacheMetrics) {<a name="line.151"></a>
+<span class="sourceLineNo">152</span>        if (result == null) {<a name="line.152"></a>
+<span class="sourceLineNo">153</span>          cacheStats.miss(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<a name="line.153"></a>
+<span class="sourceLineNo">154</span>        } else {<a name="line.154"></a>
+<span class="sourceLineNo">155</span>          cacheStats.hit(caching, cacheKey.isPrimary(), cacheKey.getBlockType());<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>    }<a name="line.158"></a>
+<span class="sourceLineNo">159</span><a name="line.159"></a>
+<span class="sourceLineNo">160</span>    return result;<a name="line.160"></a>
+<span class="sourceLineNo">161</span>  }<a name="line.161"></a>
+<span class="sourceLineNo">162</span><a name="line.162"></a>
+<span class="sourceLineNo">163</span>  @Override<a name="line.163"></a>
+<span class="sourceLineNo">164</span>  public boolean evictBlock(BlockCacheKey cacheKey) {<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    try {<a name="line.165"></a>
+<span class="sourceLineNo">166</span>      cacheStats.evict();<a name="line.166"></a>
+<span class="sourceLineNo">167</span>      return client.delete(cacheKey.toString()).get();<a name="line.167"></a>
+<span class="sourceLineNo">168</span>    } catch (InterruptedException e) {<a name="line.168"></a>
+<span class="sourceLineNo">169</span>      LOG.warn("Error deleting " + cacheKey.toString(), e);<a name="line.169"></a>
+<span class="sourceLineNo">170</span>      Thread.currentThread().interrupt();<a name="line.170"></a>
+<span class="sourceLineNo">171</span>    } catch (ExecutionException e) {<a name="line.171"></a>
+<span class="sourceLineNo">172</span>      if (LOG.isDebugEnabled()) {<a name="line.172"></a>
+<span class="sourceLineNo">173</span>        LOG.debug("Error deleting " + cacheKey.toString(), e);<a name="line.173"></a>
+<span class="sourceLineNo">174</span>      }<a name="line.174"></a>
+<span class="sourceLineNo">175</span>    }<a name="line.175"></a>
+<span class="sourceLineNo">176</span>    return false;<a name="line.176"></a>
+<span class="sourceLineNo">177</span>  }<a name="line.177"></a>
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+<span class="sourceLineNo">285</span><a name="line.285"></a>
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+<span class="sourceLineNo">291</span><a name="line.291"></a>
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+<span class="sourceLineNo">293</span>  public void returnBlock(BlockCacheKey cacheKey, Cacheable block) {<a name="line.293"></a>
+<span class="sourceLineNo">294</span>    // Not doing reference counting. All blocks here are EXCLUSIVE<a name="line.294"></a>
+<span class="sourceLineNo">295</span>  }<a name="line.295"></a>
+<span class="sourceLineNo">296</span><a name="line.296"></a>
+<span class="sourceLineNo">297</span>}<a name="line.297"></a>
 
 
 


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