http://git-wip-us.apache.org/repos/asf/hbase-site/blob/4f8b8424/devapidocs/src-html/org/apache/hadoop/hbase/Version.html
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diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/Version.html 
b/devapidocs/src-html/org/apache/hadoop/hbase/Version.html
index 6e51c4e..5a2a23d 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/Version.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/Version.html
@@ -18,9 +18,9 @@
 <span class="sourceLineNo">010</span>  public static final String version = 
"3.0.0-SNAPSHOT";<a name="line.10"></a>
 <span class="sourceLineNo">011</span>  public static final String revision = 
"";<a name="line.11"></a>
 <span class="sourceLineNo">012</span>  public static final String user = 
"jenkins";<a name="line.12"></a>
-<span class="sourceLineNo">013</span>  public static final String date = "Sat 
Dec 15 14:43:55 UTC 2018";<a name="line.13"></a>
+<span class="sourceLineNo">013</span>  public static final String date = "Tue 
Dec 18 14:46:13 UTC 2018";<a name="line.13"></a>
 <span class="sourceLineNo">014</span>  public static final String url = 
"git://jenkins-websites1.apache.org/home/jenkins/jenkins-slave/workspace/hbase_generate_website/hbase";<a
 name="line.14"></a>
-<span class="sourceLineNo">015</span>  public static final String srcChecksum 
= "25dbb3fd216cbc954b8b2ebf17377a47";<a name="line.15"></a>
+<span class="sourceLineNo">015</span>  public static final String srcChecksum 
= "0ff9598693406383f0355b09c8c7ea64";<a name="line.15"></a>
 <span class="sourceLineNo">016</span>}<a name="line.16"></a>
 
 

http://git-wip-us.apache.org/repos/asf/hbase-site/blob/4f8b8424/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.ExternalBlockCaches.html
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diff --git 
a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.ExternalBlockCaches.html
 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.ExternalBlockCaches.html
new file mode 100644
index 0000000..2a70085
--- /dev/null
+++ 
b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/BlockCacheFactory.ExternalBlockCaches.html
@@ -0,0 +1,298 @@
+<!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> * Licensed to the Apache Software 
Foundation (ASF) under one<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * or more contributor license 
agreements.  See the NOTICE file<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * distributed with this work for 
additional information<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * regarding copyright ownership.  The 
ASF licenses this file<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * to you under the Apache License, 
Version 2.0 (the<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * "License"); you may not use this file 
except in compliance<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * with the License.  You may obtain a 
copy of the License at<a name="line.8"></a>
+<span class="sourceLineNo">009</span> *<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *     
http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
+<span class="sourceLineNo">011</span> *<a name="line.11"></a>
+<span class="sourceLineNo">012</span> * Unless required by applicable law or 
agreed to in writing, software<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * distributed under the License is 
distributed on an "AS IS" BASIS,<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF 
ANY KIND, either express or implied.<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * See the License for the specific 
language governing permissions and<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * limitations under the License.<a 
name="line.16"></a>
+<span class="sourceLineNo">017</span> */<a name="line.17"></a>
+<span class="sourceLineNo">018</span>package 
org.apache.hadoop.hbase.io.hfile;<a name="line.18"></a>
+<span class="sourceLineNo">019</span><a name="line.19"></a>
+<span class="sourceLineNo">020</span>import static 
org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_IOENGINE_KEY;<a 
name="line.20"></a>
+<span class="sourceLineNo">021</span>import static 
org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_SIZE_KEY;<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><a name="line.24"></a>
+<span class="sourceLineNo">025</span>import 
org.apache.hadoop.conf.Configuration;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import 
org.apache.hadoop.hbase.HConstants;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import 
org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import 
org.apache.hadoop.hbase.io.util.MemorySizeUtil;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import 
org.apache.hadoop.hbase.util.ReflectionUtils;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import 
org.apache.hadoop.util.StringUtils;<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.slf4j.Logger;<a 
name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.slf4j.LoggerFactory;<a 
name="line.33"></a>
+<span class="sourceLineNo">034</span><a name="line.34"></a>
+<span class="sourceLineNo">035</span>@InterfaceAudience.Private<a 
name="line.35"></a>
+<span class="sourceLineNo">036</span>public final class BlockCacheFactory {<a 
name="line.36"></a>
+<span class="sourceLineNo">037</span><a name="line.37"></a>
+<span class="sourceLineNo">038</span>  private static final Logger LOG = 
LoggerFactory.getLogger(BlockCacheFactory.class.getName());<a 
name="line.38"></a>
+<span class="sourceLineNo">039</span><a name="line.39"></a>
+<span class="sourceLineNo">040</span>  /**<a name="line.40"></a>
+<span class="sourceLineNo">041</span>   * Configuration keys for Bucket 
cache<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>  /**<a name="line.44"></a>
+<span class="sourceLineNo">045</span>   * If the chosen ioengine can persist 
its state across restarts, the path to the file to persist<a name="line.45"></a>
+<span class="sourceLineNo">046</span>   * to. This file is NOT the data file. 
It is a file into which we will serialize the map of<a name="line.46"></a>
+<span class="sourceLineNo">047</span>   * what is in the data file. For 
example, if you pass the following argument as<a name="line.47"></a>
+<span class="sourceLineNo">048</span>   * BUCKET_CACHE_IOENGINE_KEY 
("hbase.bucketcache.ioengine"),<a name="line.48"></a>
+<span class="sourceLineNo">049</span>   * 
&lt;code&gt;file:/tmp/bucketcache.data &lt;/code&gt;, then we will write the 
bucketcache data to the file<a name="line.49"></a>
+<span class="sourceLineNo">050</span>   * 
&lt;code&gt;/tmp/bucketcache.data&lt;/code&gt; but the metadata on where the 
data is in the supplied file<a name="line.50"></a>
+<span class="sourceLineNo">051</span>   * is an in-memory map that needs to be 
persisted across restarts. Where to store this<a name="line.51"></a>
+<span class="sourceLineNo">052</span>   * in-memory state is what you supply 
here: e.g. &lt;code&gt;/tmp/bucketcache.map&lt;/code&gt;.<a name="line.52"></a>
+<span class="sourceLineNo">053</span>   */<a name="line.53"></a>
+<span class="sourceLineNo">054</span>  public static final String 
BUCKET_CACHE_PERSISTENT_PATH_KEY = "hbase.bucketcache.persistent.path";<a 
name="line.54"></a>
+<span class="sourceLineNo">055</span><a name="line.55"></a>
+<span class="sourceLineNo">056</span>  public static final String 
BUCKET_CACHE_WRITER_THREADS_KEY = "hbase.bucketcache.writer.threads";<a 
name="line.56"></a>
+<span class="sourceLineNo">057</span><a name="line.57"></a>
+<span class="sourceLineNo">058</span>  public static final String 
BUCKET_CACHE_WRITER_QUEUE_KEY = "hbase.bucketcache.writer.queuelength";<a 
name="line.58"></a>
+<span class="sourceLineNo">059</span><a name="line.59"></a>
+<span class="sourceLineNo">060</span>  /**<a name="line.60"></a>
+<span class="sourceLineNo">061</span>   * A comma-delimited array of values 
for use as bucket sizes.<a name="line.61"></a>
+<span class="sourceLineNo">062</span>   */<a name="line.62"></a>
+<span class="sourceLineNo">063</span>  public static final String 
BUCKET_CACHE_BUCKETS_KEY = "hbase.bucketcache.bucket.sizes";<a 
name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span>  /**<a name="line.65"></a>
+<span class="sourceLineNo">066</span>   * Defaults for Bucket cache<a 
name="line.66"></a>
+<span class="sourceLineNo">067</span>   */<a name="line.67"></a>
+<span class="sourceLineNo">068</span>  public static final int 
DEFAULT_BUCKET_CACHE_WRITER_THREADS = 3;<a name="line.68"></a>
+<span class="sourceLineNo">069</span>  public static final int 
DEFAULT_BUCKET_CACHE_WRITER_QUEUE = 64;<a name="line.69"></a>
+<span class="sourceLineNo">070</span><a name="line.70"></a>
+<span class="sourceLineNo">071</span>  /**<a name="line.71"></a>
+<span class="sourceLineNo">072</span>   * The target block size used by 
blockcache instances. Defaults to<a name="line.72"></a>
+<span class="sourceLineNo">073</span>   * {@link 
HConstants#DEFAULT_BLOCKSIZE}.<a name="line.73"></a>
+<span class="sourceLineNo">074</span>   * TODO: this config point is 
completely wrong, as it's used to determine the<a name="line.74"></a>
+<span class="sourceLineNo">075</span>   * target block size of BlockCache 
instances. Rename.<a name="line.75"></a>
+<span class="sourceLineNo">076</span>   */<a name="line.76"></a>
+<span class="sourceLineNo">077</span>  public static final String 
BLOCKCACHE_BLOCKSIZE_KEY = "hbase.offheapcache.minblocksize";<a 
name="line.77"></a>
+<span class="sourceLineNo">078</span><a name="line.78"></a>
+<span class="sourceLineNo">079</span>  private static final String 
EXTERNAL_BLOCKCACHE_KEY = "hbase.blockcache.use.external";<a name="line.79"></a>
+<span class="sourceLineNo">080</span>  private static final boolean 
EXTERNAL_BLOCKCACHE_DEFAULT = false;<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span>  private static final String 
EXTERNAL_BLOCKCACHE_CLASS_KEY = "hbase.blockcache.external.class";<a 
name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span>  private BlockCacheFactory() {<a 
name="line.84"></a>
+<span class="sourceLineNo">085</span>  }<a name="line.85"></a>
+<span class="sourceLineNo">086</span><a name="line.86"></a>
+<span class="sourceLineNo">087</span>  public static BlockCache 
createBlockCache(Configuration conf) {<a name="line.87"></a>
+<span class="sourceLineNo">088</span>    LruBlockCache onHeapCache = 
createOnHeapCache(conf);<a name="line.88"></a>
+<span class="sourceLineNo">089</span>    if (onHeapCache == null) {<a 
name="line.89"></a>
+<span class="sourceLineNo">090</span>      return null;<a name="line.90"></a>
+<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
+<span class="sourceLineNo">092</span>    boolean useExternal = 
conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);<a 
name="line.92"></a>
+<span class="sourceLineNo">093</span>    if (useExternal) {<a 
name="line.93"></a>
+<span class="sourceLineNo">094</span>      BlockCache l2CacheInstance = 
createExternalBlockcache(conf);<a name="line.94"></a>
+<span class="sourceLineNo">095</span>      return l2CacheInstance == null ?<a 
name="line.95"></a>
+<span class="sourceLineNo">096</span>          onHeapCache :<a 
name="line.96"></a>
+<span class="sourceLineNo">097</span>          new 
InclusiveCombinedBlockCache(onHeapCache, l2CacheInstance);<a name="line.97"></a>
+<span class="sourceLineNo">098</span>    } else {<a name="line.98"></a>
+<span class="sourceLineNo">099</span>      // otherwise use the bucket 
cache.<a name="line.99"></a>
+<span class="sourceLineNo">100</span>      BucketCache bucketCache = 
createBucketCache(conf);<a name="line.100"></a>
+<span class="sourceLineNo">101</span>      if 
(!conf.getBoolean("hbase.bucketcache.combinedcache.enabled", true)) {<a 
name="line.101"></a>
+<span class="sourceLineNo">102</span>        // Non combined mode is off from 
2.0<a name="line.102"></a>
+<span class="sourceLineNo">103</span>        LOG.warn(<a name="line.103"></a>
+<span class="sourceLineNo">104</span>            "From HBase 2.0 onwards only 
combined mode of LRU cache and bucket cache is available");<a 
name="line.104"></a>
+<span class="sourceLineNo">105</span>      }<a name="line.105"></a>
+<span class="sourceLineNo">106</span>      return bucketCache == null ? 
onHeapCache : new CombinedBlockCache(onHeapCache, bucketCache);<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><a name="line.109"></a>
+<span class="sourceLineNo">110</span>  private static LruBlockCache 
createOnHeapCache(final Configuration c) {<a name="line.110"></a>
+<span class="sourceLineNo">111</span>    final long cacheSize = 
MemorySizeUtil.getOnHeapCacheSize(c);<a name="line.111"></a>
+<span class="sourceLineNo">112</span>    if (cacheSize &lt; 0) {<a 
name="line.112"></a>
+<span class="sourceLineNo">113</span>      return null;<a name="line.113"></a>
+<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
+<span class="sourceLineNo">115</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.115"></a>
+<span class="sourceLineNo">116</span>    LOG.info(<a name="line.116"></a>
+<span class="sourceLineNo">117</span>        "Allocating onheap LruBlockCache 
size=" + StringUtils.byteDesc(cacheSize) + ", blockSize="<a name="line.117"></a>
+<span class="sourceLineNo">118</span>            + 
StringUtils.byteDesc(blockSize));<a name="line.118"></a>
+<span class="sourceLineNo">119</span>    return new LruBlockCache(cacheSize, 
blockSize, true, c);<a name="line.119"></a>
+<span class="sourceLineNo">120</span>  }<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span>  /**<a name="line.122"></a>
+<span class="sourceLineNo">123</span>   * Enum of all built in external block 
caches.<a name="line.123"></a>
+<span class="sourceLineNo">124</span>   * This is used for config.<a 
name="line.124"></a>
+<span class="sourceLineNo">125</span>   */<a name="line.125"></a>
+<span class="sourceLineNo">126</span>  private static enum ExternalBlockCaches 
{<a name="line.126"></a>
+<span class="sourceLineNo">127</span>    
memcached("org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache");<a 
name="line.127"></a>
+<span class="sourceLineNo">128</span>    // TODO(eclark): Consider more. 
Redis, etc.<a name="line.128"></a>
+<span class="sourceLineNo">129</span>    Class&lt;? extends BlockCache&gt; 
clazz;<a name="line.129"></a>
+<span class="sourceLineNo">130</span>    ExternalBlockCaches(String clazzName) 
{<a name="line.130"></a>
+<span class="sourceLineNo">131</span>      try {<a name="line.131"></a>
+<span class="sourceLineNo">132</span>        clazz = (Class&lt;? extends 
BlockCache&gt;) Class.forName(clazzName);<a name="line.132"></a>
+<span class="sourceLineNo">133</span>      } catch (ClassNotFoundException 
cnef) {<a name="line.133"></a>
+<span class="sourceLineNo">134</span>        clazz = null;<a 
name="line.134"></a>
+<span class="sourceLineNo">135</span>      }<a name="line.135"></a>
+<span class="sourceLineNo">136</span>    }<a name="line.136"></a>
+<span class="sourceLineNo">137</span>    ExternalBlockCaches(Class&lt;? 
extends BlockCache&gt; clazz) {<a name="line.137"></a>
+<span class="sourceLineNo">138</span>      this.clazz = clazz;<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>  private static BlockCache 
createExternalBlockcache(Configuration c) {<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("Trying to use External 
l2 cache");<a name="line.144"></a>
+<span class="sourceLineNo">145</span>    }<a name="line.145"></a>
+<span class="sourceLineNo">146</span>    Class klass = null;<a 
name="line.146"></a>
+<span class="sourceLineNo">147</span><a name="line.147"></a>
+<span class="sourceLineNo">148</span>    // Get the class, from the config. 
s<a name="line.148"></a>
+<span class="sourceLineNo">149</span>    try {<a name="line.149"></a>
+<span class="sourceLineNo">150</span>      klass = ExternalBlockCaches<a 
name="line.150"></a>
+<span class="sourceLineNo">151</span>          
.valueOf(c.get(EXTERNAL_BLOCKCACHE_CLASS_KEY, "memcache")).clazz;<a 
name="line.151"></a>
+<span class="sourceLineNo">152</span>    } catch (IllegalArgumentException 
exception) {<a name="line.152"></a>
+<span class="sourceLineNo">153</span>      try {<a name="line.153"></a>
+<span class="sourceLineNo">154</span>        klass = 
c.getClass(EXTERNAL_BLOCKCACHE_CLASS_KEY, Class.forName(<a name="line.154"></a>
+<span class="sourceLineNo">155</span>            
"org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache"));<a name="line.155"></a>
+<span class="sourceLineNo">156</span>      } catch (ClassNotFoundException e) 
{<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><a name="line.160"></a>
+<span class="sourceLineNo">161</span>    // Now try and create an instance of 
the block cache.<a name="line.161"></a>
+<span class="sourceLineNo">162</span>    try {<a name="line.162"></a>
+<span class="sourceLineNo">163</span>      LOG.info("Creating external block 
cache of type: " + klass);<a name="line.163"></a>
+<span class="sourceLineNo">164</span>      return (BlockCache) 
ReflectionUtils.newInstance(klass, c);<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    } catch (Exception e) {<a 
name="line.165"></a>
+<span class="sourceLineNo">166</span>      LOG.warn("Error creating external 
block cache", e);<a name="line.166"></a>
+<span class="sourceLineNo">167</span>    }<a name="line.167"></a>
+<span class="sourceLineNo">168</span>    return null;<a name="line.168"></a>
+<span class="sourceLineNo">169</span><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>  private static BucketCache 
createBucketCache(Configuration c) {<a name="line.172"></a>
+<span class="sourceLineNo">173</span>    // Check for L2.  ioengine name must 
be non-null.<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    String bucketCacheIOEngineName = 
c.get(BUCKET_CACHE_IOENGINE_KEY, null);<a name="line.174"></a>
+<span class="sourceLineNo">175</span>    if (bucketCacheIOEngineName == null 
|| bucketCacheIOEngineName.length() &lt;= 0) {<a name="line.175"></a>
+<span class="sourceLineNo">176</span>      return null;<a name="line.176"></a>
+<span class="sourceLineNo">177</span>    }<a name="line.177"></a>
+<span class="sourceLineNo">178</span><a name="line.178"></a>
+<span class="sourceLineNo">179</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.179"></a>
+<span class="sourceLineNo">180</span>    final long bucketCacheSize = 
MemorySizeUtil.getBucketCacheSize(c);<a name="line.180"></a>
+<span class="sourceLineNo">181</span>    if (bucketCacheSize &lt;= 0) {<a 
name="line.181"></a>
+<span class="sourceLineNo">182</span>      throw new 
IllegalStateException("bucketCacheSize &lt;= 0; Check " +<a name="line.182"></a>
+<span class="sourceLineNo">183</span>          BUCKET_CACHE_SIZE_KEY + " 
setting and/or server java heap size");<a name="line.183"></a>
+<span class="sourceLineNo">184</span>    }<a name="line.184"></a>
+<span class="sourceLineNo">185</span>    if 
(c.get("hbase.bucketcache.percentage.in.combinedcache") != null) {<a 
name="line.185"></a>
+<span class="sourceLineNo">186</span>      LOG.warn("Configuration 
'hbase.bucketcache.percentage.in.combinedcache' is no longer "<a 
name="line.186"></a>
+<span class="sourceLineNo">187</span>          + "respected. See comments in 
http://hbase.apache.org/book.html#_changes_of_note";);<a name="line.187"></a>
+<span class="sourceLineNo">188</span>    }<a name="line.188"></a>
+<span class="sourceLineNo">189</span>    int writerThreads = 
c.getInt(BUCKET_CACHE_WRITER_THREADS_KEY,<a name="line.189"></a>
+<span class="sourceLineNo">190</span>        
DEFAULT_BUCKET_CACHE_WRITER_THREADS);<a name="line.190"></a>
+<span class="sourceLineNo">191</span>    int writerQueueLen = 
c.getInt(BUCKET_CACHE_WRITER_QUEUE_KEY,<a name="line.191"></a>
+<span class="sourceLineNo">192</span>        
DEFAULT_BUCKET_CACHE_WRITER_QUEUE);<a name="line.192"></a>
+<span class="sourceLineNo">193</span>    String persistentPath = 
c.get(BUCKET_CACHE_PERSISTENT_PATH_KEY);<a name="line.193"></a>
+<span class="sourceLineNo">194</span>    String[] configuredBucketSizes = 
c.getStrings(BUCKET_CACHE_BUCKETS_KEY);<a name="line.194"></a>
+<span class="sourceLineNo">195</span>    int [] bucketSizes = null;<a 
name="line.195"></a>
+<span class="sourceLineNo">196</span>    if (configuredBucketSizes != null) 
{<a name="line.196"></a>
+<span class="sourceLineNo">197</span>      bucketSizes = new 
int[configuredBucketSizes.length];<a name="line.197"></a>
+<span class="sourceLineNo">198</span>      for (int i = 0; i &lt; 
configuredBucketSizes.length; i++) {<a name="line.198"></a>
+<span class="sourceLineNo">199</span>        int bucketSize = 
Integer.parseInt(configuredBucketSizes[i].trim());<a name="line.199"></a>
+<span class="sourceLineNo">200</span>        if (bucketSize % 256 != 0) {<a 
name="line.200"></a>
+<span class="sourceLineNo">201</span>          // We need all the bucket sizes 
to be multiples of 256. Having all the configured bucket<a name="line.201"></a>
+<span class="sourceLineNo">202</span>          // sizes to be multiples of 256 
will ensure that the block offsets within buckets,<a name="line.202"></a>
+<span class="sourceLineNo">203</span>          // that are calculated, will 
also be multiples of 256.<a name="line.203"></a>
+<span class="sourceLineNo">204</span>          // See BucketEntry where offset 
to each block is represented using 5 bytes (instead of 8<a name="line.204"></a>
+<span class="sourceLineNo">205</span>          // bytes long). We would like 
to save heap overhead as less as possible.<a name="line.205"></a>
+<span class="sourceLineNo">206</span>          throw new 
IllegalArgumentException("Illegal value: " + bucketSize + " configured for '"<a 
name="line.206"></a>
+<span class="sourceLineNo">207</span>              + BUCKET_CACHE_BUCKETS_KEY 
+ "'. All bucket sizes to be multiples of 256");<a name="line.207"></a>
+<span class="sourceLineNo">208</span>        }<a name="line.208"></a>
+<span class="sourceLineNo">209</span>        bucketSizes[i] = bucketSize;<a 
name="line.209"></a>
+<span class="sourceLineNo">210</span>      }<a name="line.210"></a>
+<span class="sourceLineNo">211</span>    }<a name="line.211"></a>
+<span class="sourceLineNo">212</span>    BucketCache bucketCache = null;<a 
name="line.212"></a>
+<span class="sourceLineNo">213</span>    try {<a name="line.213"></a>
+<span class="sourceLineNo">214</span>      int ioErrorsTolerationDuration = 
c.getInt(<a name="line.214"></a>
+<span class="sourceLineNo">215</span>          
"hbase.bucketcache.ioengine.errors.tolerated.duration",<a name="line.215"></a>
+<span class="sourceLineNo">216</span>          
BucketCache.DEFAULT_ERROR_TOLERATION_DURATION);<a name="line.216"></a>
+<span class="sourceLineNo">217</span>      // Bucket cache logs its stats on 
creation internal to the constructor.<a name="line.217"></a>
+<span class="sourceLineNo">218</span>      bucketCache = new 
BucketCache(bucketCacheIOEngineName,<a name="line.218"></a>
+<span class="sourceLineNo">219</span>          bucketCacheSize, blockSize, 
bucketSizes, writerThreads, writerQueueLen, persistentPath,<a 
name="line.219"></a>
+<span class="sourceLineNo">220</span>          ioErrorsTolerationDuration, 
c);<a name="line.220"></a>
+<span class="sourceLineNo">221</span>    } catch (IOException ioex) {<a 
name="line.221"></a>
+<span class="sourceLineNo">222</span>      LOG.error("Can't instantiate bucket 
cache", ioex); throw new RuntimeException(ioex);<a name="line.222"></a>
+<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
+<span class="sourceLineNo">224</span>    return bucketCache;<a 
name="line.224"></a>
+<span class="sourceLineNo">225</span>  }<a name="line.225"></a>
+<span class="sourceLineNo">226</span>}<a name="line.226"></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> * Licensed to the Apache Software 
Foundation (ASF) under one<a name="line.2"></a>
+<span class="sourceLineNo">003</span> * or more contributor license 
agreements.  See the NOTICE file<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * distributed with this work for 
additional information<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * regarding copyright ownership.  The 
ASF licenses this file<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * to you under the Apache License, 
Version 2.0 (the<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * "License"); you may not use this file 
except in compliance<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * with the License.  You may obtain a 
copy of the License at<a name="line.8"></a>
+<span class="sourceLineNo">009</span> *<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *     
http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
+<span class="sourceLineNo">011</span> *<a name="line.11"></a>
+<span class="sourceLineNo">012</span> * Unless required by applicable law or 
agreed to in writing, software<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * distributed under the License is 
distributed on an "AS IS" BASIS,<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF 
ANY KIND, either express or implied.<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * See the License for the specific 
language governing permissions and<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * limitations under the License.<a 
name="line.16"></a>
+<span class="sourceLineNo">017</span> */<a name="line.17"></a>
+<span class="sourceLineNo">018</span>package 
org.apache.hadoop.hbase.io.hfile;<a name="line.18"></a>
+<span class="sourceLineNo">019</span><a name="line.19"></a>
+<span class="sourceLineNo">020</span>import static 
org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_IOENGINE_KEY;<a 
name="line.20"></a>
+<span class="sourceLineNo">021</span>import static 
org.apache.hadoop.hbase.HConstants.BUCKET_CACHE_SIZE_KEY;<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><a name="line.24"></a>
+<span class="sourceLineNo">025</span>import 
org.apache.hadoop.conf.Configuration;<a name="line.25"></a>
+<span class="sourceLineNo">026</span>import 
org.apache.hadoop.hbase.HConstants;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import 
org.apache.hadoop.hbase.io.hfile.bucket.BucketCache;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import 
org.apache.hadoop.hbase.io.util.MemorySizeUtil;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import 
org.apache.hadoop.hbase.util.ReflectionUtils;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import 
org.apache.hadoop.util.StringUtils;<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.slf4j.Logger;<a 
name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.slf4j.LoggerFactory;<a 
name="line.33"></a>
+<span class="sourceLineNo">034</span><a name="line.34"></a>
+<span class="sourceLineNo">035</span>@InterfaceAudience.Private<a 
name="line.35"></a>
+<span class="sourceLineNo">036</span>public final class BlockCacheFactory {<a 
name="line.36"></a>
+<span class="sourceLineNo">037</span><a name="line.37"></a>
+<span class="sourceLineNo">038</span>  private static final Logger LOG = 
LoggerFactory.getLogger(BlockCacheFactory.class.getName());<a 
name="line.38"></a>
+<span class="sourceLineNo">039</span><a name="line.39"></a>
+<span class="sourceLineNo">040</span>  /**<a name="line.40"></a>
+<span class="sourceLineNo">041</span>   * Configuration keys for Bucket 
cache<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>  /**<a name="line.44"></a>
+<span class="sourceLineNo">045</span>   * If the chosen ioengine can persist 
its state across restarts, the path to the file to persist<a name="line.45"></a>
+<span class="sourceLineNo">046</span>   * to. This file is NOT the data file. 
It is a file into which we will serialize the map of<a name="line.46"></a>
+<span class="sourceLineNo">047</span>   * what is in the data file. For 
example, if you pass the following argument as<a name="line.47"></a>
+<span class="sourceLineNo">048</span>   * BUCKET_CACHE_IOENGINE_KEY 
("hbase.bucketcache.ioengine"),<a name="line.48"></a>
+<span class="sourceLineNo">049</span>   * 
&lt;code&gt;file:/tmp/bucketcache.data &lt;/code&gt;, then we will write the 
bucketcache data to the file<a name="line.49"></a>
+<span class="sourceLineNo">050</span>   * 
&lt;code&gt;/tmp/bucketcache.data&lt;/code&gt; but the metadata on where the 
data is in the supplied file<a name="line.50"></a>
+<span class="sourceLineNo">051</span>   * is an in-memory map that needs to be 
persisted across restarts. Where to store this<a name="line.51"></a>
+<span class="sourceLineNo">052</span>   * in-memory state is what you supply 
here: e.g. &lt;code&gt;/tmp/bucketcache.map&lt;/code&gt;.<a name="line.52"></a>
+<span class="sourceLineNo">053</span>   */<a name="line.53"></a>
+<span class="sourceLineNo">054</span>  public static final String 
BUCKET_CACHE_PERSISTENT_PATH_KEY = "hbase.bucketcache.persistent.path";<a 
name="line.54"></a>
+<span class="sourceLineNo">055</span><a name="line.55"></a>
+<span class="sourceLineNo">056</span>  public static final String 
BUCKET_CACHE_WRITER_THREADS_KEY = "hbase.bucketcache.writer.threads";<a 
name="line.56"></a>
+<span class="sourceLineNo">057</span><a name="line.57"></a>
+<span class="sourceLineNo">058</span>  public static final String 
BUCKET_CACHE_WRITER_QUEUE_KEY = "hbase.bucketcache.writer.queuelength";<a 
name="line.58"></a>
+<span class="sourceLineNo">059</span><a name="line.59"></a>
+<span class="sourceLineNo">060</span>  /**<a name="line.60"></a>
+<span class="sourceLineNo">061</span>   * A comma-delimited array of values 
for use as bucket sizes.<a name="line.61"></a>
+<span class="sourceLineNo">062</span>   */<a name="line.62"></a>
+<span class="sourceLineNo">063</span>  public static final String 
BUCKET_CACHE_BUCKETS_KEY = "hbase.bucketcache.bucket.sizes";<a 
name="line.63"></a>
+<span class="sourceLineNo">064</span><a name="line.64"></a>
+<span class="sourceLineNo">065</span>  /**<a name="line.65"></a>
+<span class="sourceLineNo">066</span>   * Defaults for Bucket cache<a 
name="line.66"></a>
+<span class="sourceLineNo">067</span>   */<a name="line.67"></a>
+<span class="sourceLineNo">068</span>  public static final int 
DEFAULT_BUCKET_CACHE_WRITER_THREADS = 3;<a name="line.68"></a>
+<span class="sourceLineNo">069</span>  public static final int 
DEFAULT_BUCKET_CACHE_WRITER_QUEUE = 64;<a name="line.69"></a>
+<span class="sourceLineNo">070</span><a name="line.70"></a>
+<span class="sourceLineNo">071</span>  /**<a name="line.71"></a>
+<span class="sourceLineNo">072</span>   * The target block size used by 
blockcache instances. Defaults to<a name="line.72"></a>
+<span class="sourceLineNo">073</span>   * {@link 
HConstants#DEFAULT_BLOCKSIZE}.<a name="line.73"></a>
+<span class="sourceLineNo">074</span>   * TODO: this config point is 
completely wrong, as it's used to determine the<a name="line.74"></a>
+<span class="sourceLineNo">075</span>   * target block size of BlockCache 
instances. Rename.<a name="line.75"></a>
+<span class="sourceLineNo">076</span>   */<a name="line.76"></a>
+<span class="sourceLineNo">077</span>  public static final String 
BLOCKCACHE_BLOCKSIZE_KEY = "hbase.offheapcache.minblocksize";<a 
name="line.77"></a>
+<span class="sourceLineNo">078</span><a name="line.78"></a>
+<span class="sourceLineNo">079</span>  private static final String 
EXTERNAL_BLOCKCACHE_KEY = "hbase.blockcache.use.external";<a name="line.79"></a>
+<span class="sourceLineNo">080</span>  private static final boolean 
EXTERNAL_BLOCKCACHE_DEFAULT = false;<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span>  private static final String 
EXTERNAL_BLOCKCACHE_CLASS_KEY = "hbase.blockcache.external.class";<a 
name="line.82"></a>
+<span class="sourceLineNo">083</span><a name="line.83"></a>
+<span class="sourceLineNo">084</span>  private BlockCacheFactory() {<a 
name="line.84"></a>
+<span class="sourceLineNo">085</span>  }<a name="line.85"></a>
+<span class="sourceLineNo">086</span><a name="line.86"></a>
+<span class="sourceLineNo">087</span>  public static BlockCache 
createBlockCache(Configuration conf) {<a name="line.87"></a>
+<span class="sourceLineNo">088</span>    LruBlockCache onHeapCache = 
createOnHeapCache(conf);<a name="line.88"></a>
+<span class="sourceLineNo">089</span>    if (onHeapCache == null) {<a 
name="line.89"></a>
+<span class="sourceLineNo">090</span>      return null;<a name="line.90"></a>
+<span class="sourceLineNo">091</span>    }<a name="line.91"></a>
+<span class="sourceLineNo">092</span>    boolean useExternal = 
conf.getBoolean(EXTERNAL_BLOCKCACHE_KEY, EXTERNAL_BLOCKCACHE_DEFAULT);<a 
name="line.92"></a>
+<span class="sourceLineNo">093</span>    if (useExternal) {<a 
name="line.93"></a>
+<span class="sourceLineNo">094</span>      BlockCache l2CacheInstance = 
createExternalBlockcache(conf);<a name="line.94"></a>
+<span class="sourceLineNo">095</span>      return l2CacheInstance == null ?<a 
name="line.95"></a>
+<span class="sourceLineNo">096</span>          onHeapCache :<a 
name="line.96"></a>
+<span class="sourceLineNo">097</span>          new 
InclusiveCombinedBlockCache(onHeapCache, l2CacheInstance);<a name="line.97"></a>
+<span class="sourceLineNo">098</span>    } else {<a name="line.98"></a>
+<span class="sourceLineNo">099</span>      // otherwise use the bucket 
cache.<a name="line.99"></a>
+<span class="sourceLineNo">100</span>      BucketCache bucketCache = 
createBucketCache(conf);<a name="line.100"></a>
+<span class="sourceLineNo">101</span>      if 
(!conf.getBoolean("hbase.bucketcache.combinedcache.enabled", true)) {<a 
name="line.101"></a>
+<span class="sourceLineNo">102</span>        // Non combined mode is off from 
2.0<a name="line.102"></a>
+<span class="sourceLineNo">103</span>        LOG.warn(<a name="line.103"></a>
+<span class="sourceLineNo">104</span>            "From HBase 2.0 onwards only 
combined mode of LRU cache and bucket cache is available");<a 
name="line.104"></a>
+<span class="sourceLineNo">105</span>      }<a name="line.105"></a>
+<span class="sourceLineNo">106</span>      return bucketCache == null ? 
onHeapCache : new CombinedBlockCache(onHeapCache, bucketCache);<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><a name="line.109"></a>
+<span class="sourceLineNo">110</span>  private static LruBlockCache 
createOnHeapCache(final Configuration c) {<a name="line.110"></a>
+<span class="sourceLineNo">111</span>    final long cacheSize = 
MemorySizeUtil.getOnHeapCacheSize(c);<a name="line.111"></a>
+<span class="sourceLineNo">112</span>    if (cacheSize &lt; 0) {<a 
name="line.112"></a>
+<span class="sourceLineNo">113</span>      return null;<a name="line.113"></a>
+<span class="sourceLineNo">114</span>    }<a name="line.114"></a>
+<span class="sourceLineNo">115</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.115"></a>
+<span class="sourceLineNo">116</span>    LOG.info(<a name="line.116"></a>
+<span class="sourceLineNo">117</span>        "Allocating onheap LruBlockCache 
size=" + StringUtils.byteDesc(cacheSize) + ", blockSize="<a name="line.117"></a>
+<span class="sourceLineNo">118</span>            + 
StringUtils.byteDesc(blockSize));<a name="line.118"></a>
+<span class="sourceLineNo">119</span>    return new LruBlockCache(cacheSize, 
blockSize, true, c);<a name="line.119"></a>
+<span class="sourceLineNo">120</span>  }<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span>  /**<a name="line.122"></a>
+<span class="sourceLineNo">123</span>   * Enum of all built in external block 
caches.<a name="line.123"></a>
+<span class="sourceLineNo">124</span>   * This is used for config.<a 
name="line.124"></a>
+<span class="sourceLineNo">125</span>   */<a name="line.125"></a>
+<span class="sourceLineNo">126</span>  private static enum ExternalBlockCaches 
{<a name="line.126"></a>
+<span class="sourceLineNo">127</span>    
memcached("org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache");<a 
name="line.127"></a>
+<span class="sourceLineNo">128</span>    // TODO(eclark): Consider more. 
Redis, etc.<a name="line.128"></a>
+<span class="sourceLineNo">129</span>    Class&lt;? extends BlockCache&gt; 
clazz;<a name="line.129"></a>
+<span class="sourceLineNo">130</span>    ExternalBlockCaches(String clazzName) 
{<a name="line.130"></a>
+<span class="sourceLineNo">131</span>      try {<a name="line.131"></a>
+<span class="sourceLineNo">132</span>        clazz = (Class&lt;? extends 
BlockCache&gt;) Class.forName(clazzName);<a name="line.132"></a>
+<span class="sourceLineNo">133</span>      } catch (ClassNotFoundException 
cnef) {<a name="line.133"></a>
+<span class="sourceLineNo">134</span>        clazz = null;<a 
name="line.134"></a>
+<span class="sourceLineNo">135</span>      }<a name="line.135"></a>
+<span class="sourceLineNo">136</span>    }<a name="line.136"></a>
+<span class="sourceLineNo">137</span>    ExternalBlockCaches(Class&lt;? 
extends BlockCache&gt; clazz) {<a name="line.137"></a>
+<span class="sourceLineNo">138</span>      this.clazz = clazz;<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>  private static BlockCache 
createExternalBlockcache(Configuration c) {<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("Trying to use External 
l2 cache");<a name="line.144"></a>
+<span class="sourceLineNo">145</span>    }<a name="line.145"></a>
+<span class="sourceLineNo">146</span>    Class klass = null;<a 
name="line.146"></a>
+<span class="sourceLineNo">147</span><a name="line.147"></a>
+<span class="sourceLineNo">148</span>    // Get the class, from the config. 
s<a name="line.148"></a>
+<span class="sourceLineNo">149</span>    try {<a name="line.149"></a>
+<span class="sourceLineNo">150</span>      klass = ExternalBlockCaches<a 
name="line.150"></a>
+<span class="sourceLineNo">151</span>          
.valueOf(c.get(EXTERNAL_BLOCKCACHE_CLASS_KEY, "memcache")).clazz;<a 
name="line.151"></a>
+<span class="sourceLineNo">152</span>    } catch (IllegalArgumentException 
exception) {<a name="line.152"></a>
+<span class="sourceLineNo">153</span>      try {<a name="line.153"></a>
+<span class="sourceLineNo">154</span>        klass = 
c.getClass(EXTERNAL_BLOCKCACHE_CLASS_KEY, Class.forName(<a name="line.154"></a>
+<span class="sourceLineNo">155</span>            
"org.apache.hadoop.hbase.io.hfile.MemcachedBlockCache"));<a name="line.155"></a>
+<span class="sourceLineNo">156</span>      } catch (ClassNotFoundException e) 
{<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><a name="line.160"></a>
+<span class="sourceLineNo">161</span>    // Now try and create an instance of 
the block cache.<a name="line.161"></a>
+<span class="sourceLineNo">162</span>    try {<a name="line.162"></a>
+<span class="sourceLineNo">163</span>      LOG.info("Creating external block 
cache of type: " + klass);<a name="line.163"></a>
+<span class="sourceLineNo">164</span>      return (BlockCache) 
ReflectionUtils.newInstance(klass, c);<a name="line.164"></a>
+<span class="sourceLineNo">165</span>    } catch (Exception e) {<a 
name="line.165"></a>
+<span class="sourceLineNo">166</span>      LOG.warn("Error creating external 
block cache", e);<a name="line.166"></a>
+<span class="sourceLineNo">167</span>    }<a name="line.167"></a>
+<span class="sourceLineNo">168</span>    return null;<a name="line.168"></a>
+<span class="sourceLineNo">169</span><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>  private static BucketCache 
createBucketCache(Configuration c) {<a name="line.172"></a>
+<span class="sourceLineNo">173</span>    // Check for L2.  ioengine name must 
be non-null.<a name="line.173"></a>
+<span class="sourceLineNo">174</span>    String bucketCacheIOEngineName = 
c.get(BUCKET_CACHE_IOENGINE_KEY, null);<a name="line.174"></a>
+<span class="sourceLineNo">175</span>    if (bucketCacheIOEngineName == null 
|| bucketCacheIOEngineName.length() &lt;= 0) {<a name="line.175"></a>
+<span class="sourceLineNo">176</span>      return null;<a name="line.176"></a>
+<span class="sourceLineNo">177</span>    }<a name="line.177"></a>
+<span class="sourceLineNo">178</span><a name="line.178"></a>
+<span class="sourceLineNo">179</span>    int blockSize = 
c.getInt(BLOCKCACHE_BLOCKSIZE_KEY, HConstants.DEFAULT_BLOCKSIZE);<a 
name="line.179"></a>
+<span class="sourceLineNo">180</span>    final long bucketCacheSize = 
MemorySizeUtil.getBucketCacheSize(c);<a name="line.180"></a>
+<span class="sourceLineNo">181</span>    if (bucketCacheSize &lt;= 0) {<a 
name="line.181"></a>
+<span class="sourceLineNo">182</span>      throw new 
IllegalStateException("bucketCacheSize &lt;= 0; Check " +<a name="line.182"></a>
+<span class="sourceLineNo">183</span>          BUCKET_CACHE_SIZE_KEY + " 
setting and/or server java heap size");<a name="line.183"></a>
+<span class="sourceLineNo">184</span>    }<a name="line.184"></a>
+<span class="sourceLineNo">185</span>    if 
(c.get("hbase.bucketcache.percentage.in.combinedcache") != null) {<a 
name="line.185"></a>
+<span class="sourceLineNo">186</span>      LOG.warn("Configuration 
'hbase.bucketcache.percentage.in.combinedcache' is no longer "<a 
name="line.186"></a>
+<span class="sourceLineNo">187</span>          + "respected. See comments in 
http://hbase.apache.org/book.html#_changes_of_note";);<a name="line.187"></a>
+<span class="sourceLineNo">188</span>    }<a name="line.188"></a>
+<span class="sourceLineNo">189</span>    int writerThreads = 
c.getInt(BUCKET_CACHE_WRITER_THREADS_KEY,<a name="line.189"></a>
+<span class="sourceLineNo">190</span>        
DEFAULT_BUCKET_CACHE_WRITER_THREADS);<a name="line.190"></a>
+<span class="sourceLineNo">191</span>    int writerQueueLen = 
c.getInt(BUCKET_CACHE_WRITER_QUEUE_KEY,<a name="line.191"></a>
+<span class="sourceLineNo">192</span>        
DEFAULT_BUCKET_CACHE_WRITER_QUEUE);<a name="line.192"></a>
+<span class="sourceLineNo">193</span>    String persistentPath = 
c.get(BUCKET_CACHE_PERSISTENT_PATH_KEY);<a name="line.193"></a>
+<span class="sourceLineNo">194</span>    String[] configuredBucketSizes = 
c.getStrings(BUCKET_CACHE_BUCKETS_KEY);<a name="line.194"></a>
+<span class="sourceLineNo">195</span>    int [] bucketSizes = null;<a 
name="line.195"></a>
+<span class="sourceLineNo">196</span>    if (configuredBucketSizes != null) 
{<a name="line.196"></a>
+<span class="sourceLineNo">197</span>      bucketSizes = new 
int[configuredBucketSizes.length];<a name="line.197"></a>
+<span class="sourceLineNo">198</span>      for (int i = 0; i &lt; 
configuredBucketSizes.length; i++) {<a name="line.198"></a>
+<span class="sourceLineNo">199</span>        int bucketSize = 
Integer.parseInt(configuredBucketSizes[i].trim());<a name="line.199"></a>
+<span class="sourceLineNo">200</span>        if (bucketSize % 256 != 0) {<a 
name="line.200"></a>
+<span class="sourceLineNo">201</span>          // We need all the bucket sizes 
to be multiples of 256. Having all the configured bucket<a name="line.201"></a>
+<span class="sourceLineNo">202</span>          // sizes to be multiples of 256 
will ensure that the block offsets within buckets,<a name="line.202"></a>
+<span class="sourceLineNo">203</span>          // that are calculated, will 
also be multiples of 256.<a name="line.203"></a>
+<span class="sourceLineNo">204</span>          // See BucketEntry where offset 
to each block is represented using 5 bytes (instead of 8<a name="line.204"></a>
+<span class="sourceLineNo">205</span>          // bytes long). We would like 
to save heap overhead as less as possible.<a name="line.205"></a>
+<span class="sourceLineNo">206</span>          throw new 
IllegalArgumentException("Illegal value: " + bucketSize + " configured for '"<a 
name="line.206"></a>
+<span class="sourceLineNo">207</span>              + BUCKET_CACHE_BUCKETS_KEY 
+ "'. All bucket sizes to be multiples of 256");<a name="line.207"></a>
+<span class="sourceLineNo">208</span>        }<a name="line.208"></a>
+<span class="sourceLineNo">209</span>        bucketSizes[i] = bucketSize;<a 
name="line.209"></a>
+<span class="sourceLineNo">210</span>      }<a name="line.210"></a>
+<span class="sourceLineNo">211</span>    }<a name="line.211"></a>
+<span class="sourceLineNo">212</span>    BucketCache bucketCache = null;<a 
name="line.212"></a>
+<span class="sourceLineNo">213</span>    try {<a name="line.213"></a>
+<span class="sourceLineNo">214</span>      int ioErrorsTolerationDuration = 
c.getInt(<a name="line.214"></a>
+<span class="sourceLineNo">215</span>          
"hbase.bucketcache.ioengine.errors.tolerated.duration",<a name="line.215"></a>
+<span class="sourceLineNo">216</span>          
BucketCache.DEFAULT_ERROR_TOLERATION_DURATION);<a name="line.216"></a>
+<span class="sourceLineNo">217</span>      // Bucket cache logs its stats on 
creation internal to the constructor.<a name="line.217"></a>
+<span class="sourceLineNo">218</span>      bucketCache = new 
BucketCache(bucketCacheIOEngineName,<a name="line.218"></a>
+<span class="sourceLineNo">219</span>          bucketCacheSize, blockSize, 
bucketSizes, writerThreads, writerQueueLen, persistentPath,<a 
name="line.219"></a>
+<span class="sourceLineNo">220</span>          ioErrorsTolerationDuration, 
c);<a name="line.220"></a>
+<span class="sourceLineNo">221</span>    } catch (IOException ioex) {<a 
name="line.221"></a>
+<span class="sourceLineNo">222</span>      LOG.error("Can't instantiate bucket 
cache", ioex); throw new RuntimeException(ioex);<a name="line.222"></a>
+<span class="sourceLineNo">223</span>    }<a name="line.223"></a>
+<span class="sourceLineNo">224</span>    return bucketCache;<a 
name="line.224"></a>
+<span class="sourceLineNo">225</span>  }<a name="line.225"></a>
+<span class="sourceLineNo">226</span>}<a name="line.226"></a>
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+</pre>
+</div>
+</body>
+</html>

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