You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hbase.apache.org by mi...@apache.org on 2016/02/23 18:08:20 UTC
[12/51] [partial] hbase-site git commit: Published site at
58283fa1b1b10beec62cefa40babff6a1424b06c.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/d02dd5db/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html
index 158282b..5c5872e 100644
--- a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/ByteBufferIOEngine.html
@@ -34,98 +34,110 @@
<span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.util.ByteBufferArray;<a name="line.29"></a>
-<span class="sourceLineNo">030</span><a name="line.30"></a>
-<span class="sourceLineNo">031</span>/**<a name="line.31"></a>
-<span class="sourceLineNo">032</span> * IO engine that stores data in memory using an array of ByteBuffers<a name="line.32"></a>
-<span class="sourceLineNo">033</span> * {@link ByteBufferArray}<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 class ByteBufferIOEngine implements IOEngine {<a name="line.36"></a>
-<span class="sourceLineNo">037</span> private ByteBufferArray bufferArray;<a name="line.37"></a>
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-<span class="sourceLineNo">040</span><a name="line.40"></a>
-<span class="sourceLineNo">041</span> /**<a name="line.41"></a>
-<span class="sourceLineNo">042</span> * Construct the ByteBufferIOEngine with the given capacity<a name="line.42"></a>
-<span class="sourceLineNo">043</span> * @param capacity<a name="line.43"></a>
-<span class="sourceLineNo">044</span> * @param direct true if allocate direct buffer<a name="line.44"></a>
-<span class="sourceLineNo">045</span> * @throws IOException<a name="line.45"></a>
-<span class="sourceLineNo">046</span> */<a name="line.46"></a>
-<span class="sourceLineNo">047</span> public ByteBufferIOEngine(long capacity, boolean direct)<a name="line.47"></a>
-<span class="sourceLineNo">048</span> throws IOException {<a name="line.48"></a>
-<span class="sourceLineNo">049</span> this.capacity = capacity;<a name="line.49"></a>
-<span class="sourceLineNo">050</span> this.direct = direct;<a name="line.50"></a>
-<span class="sourceLineNo">051</span> bufferArray = new ByteBufferArray(capacity, direct);<a name="line.51"></a>
-<span class="sourceLineNo">052</span> }<a name="line.52"></a>
-<span class="sourceLineNo">053</span><a name="line.53"></a>
-<span class="sourceLineNo">054</span> @Override<a name="line.54"></a>
-<span class="sourceLineNo">055</span> public String toString() {<a name="line.55"></a>
-<span class="sourceLineNo">056</span> return "ioengine=" + this.getClass().getSimpleName() + ", capacity=" +<a name="line.56"></a>
-<span class="sourceLineNo">057</span> String.format("%,d", this.capacity) + ", direct=" + this.direct;<a name="line.57"></a>
-<span class="sourceLineNo">058</span> }<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> * Memory IO engine is always unable to support persistent storage for the<a name="line.61"></a>
-<span class="sourceLineNo">062</span> * cache<a name="line.62"></a>
-<span class="sourceLineNo">063</span> * @return false<a name="line.63"></a>
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-<span class="sourceLineNo">065</span> @Override<a name="line.65"></a>
-<span class="sourceLineNo">066</span> public boolean isPersistent() {<a name="line.66"></a>
-<span class="sourceLineNo">067</span> return false;<a name="line.67"></a>
-<span class="sourceLineNo">068</span> }<a name="line.68"></a>
-<span class="sourceLineNo">069</span><a name="line.69"></a>
-<span class="sourceLineNo">070</span> @Override<a name="line.70"></a>
-<span class="sourceLineNo">071</span> public Cacheable read(long offset, int length, CacheableDeserializer<Cacheable> deserializer)<a name="line.71"></a>
-<span class="sourceLineNo">072</span> throws IOException {<a name="line.72"></a>
-<span class="sourceLineNo">073</span> ByteBuff dstBuffer = bufferArray.asSubByteBuff(offset, length);<a name="line.73"></a>
-<span class="sourceLineNo">074</span> // Here the buffer that is created directly refers to the buffer in the actual buckets.<a name="line.74"></a>
-<span class="sourceLineNo">075</span> // When any cell is referring to the blocks created out of these buckets then it means that<a name="line.75"></a>
-<span class="sourceLineNo">076</span> // those cells are referring to a shared memory area which if evicted by the BucketCache would<a name="line.76"></a>
-<span class="sourceLineNo">077</span> // lead to corruption of results. Hence we set the type of the buffer as SHARED_MEMORY<a name="line.77"></a>
-<span class="sourceLineNo">078</span> // so that the readers using this block are aware of this fact and do the necessary action<a name="line.78"></a>
-<span class="sourceLineNo">079</span> // to prevent eviction till the results are either consumed or copied<a name="line.79"></a>
-<span class="sourceLineNo">080</span> return deserializer.deserialize(dstBuffer, true, MemoryType.SHARED);<a name="line.80"></a>
-<span class="sourceLineNo">081</span> }<a name="line.81"></a>
-<span class="sourceLineNo">082</span><a name="line.82"></a>
-<span class="sourceLineNo">083</span> /**<a name="line.83"></a>
-<span class="sourceLineNo">084</span> * Transfers data from the given byte buffer to the buffer array<a name="line.84"></a>
-<span class="sourceLineNo">085</span> * @param srcBuffer the given byte buffer from which bytes are to be read<a name="line.85"></a>
-<span class="sourceLineNo">086</span> * @param offset The offset in the ByteBufferArray of the first byte to be<a name="line.86"></a>
-<span class="sourceLineNo">087</span> * written<a name="line.87"></a>
-<span class="sourceLineNo">088</span> * @throws IOException<a name="line.88"></a>
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-<span class="sourceLineNo">090</span> @Override<a name="line.90"></a>
-<span class="sourceLineNo">091</span> public void write(ByteBuffer srcBuffer, long offset) throws IOException {<a name="line.91"></a>
-<span class="sourceLineNo">092</span> assert srcBuffer.hasArray();<a name="line.92"></a>
-<span class="sourceLineNo">093</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.93"></a>
-<span class="sourceLineNo">094</span> srcBuffer.arrayOffset());<a name="line.94"></a>
-<span class="sourceLineNo">095</span> }<a name="line.95"></a>
-<span class="sourceLineNo">096</span><a name="line.96"></a>
-<span class="sourceLineNo">097</span> @Override<a name="line.97"></a>
-<span class="sourceLineNo">098</span> public void write(ByteBuff srcBuffer, long offset) throws IOException {<a name="line.98"></a>
-<span class="sourceLineNo">099</span> // When caching block into BucketCache there will be single buffer backing for this HFileBlock.<a name="line.99"></a>
-<span class="sourceLineNo">100</span> // This will work for now. But from the DFS itself if we get DBB then this may not hold true.<a name="line.100"></a>
-<span class="sourceLineNo">101</span> assert srcBuffer.hasArray();<a name="line.101"></a>
-<span class="sourceLineNo">102</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.102"></a>
-<span class="sourceLineNo">103</span> srcBuffer.arrayOffset());<a name="line.103"></a>
-<span class="sourceLineNo">104</span> }<a name="line.104"></a>
-<span class="sourceLineNo">105</span> /**<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * No operation for the sync in the memory IO engine<a name="line.106"></a>
-<span class="sourceLineNo">107</span> */<a name="line.107"></a>
-<span class="sourceLineNo">108</span> @Override<a name="line.108"></a>
-<span class="sourceLineNo">109</span> public void sync() {<a name="line.109"></a>
-<span class="sourceLineNo">110</span> // Nothing to do.<a name="line.110"></a>
-<span class="sourceLineNo">111</span> }<a name="line.111"></a>
-<span class="sourceLineNo">112</span><a name="line.112"></a>
-<span class="sourceLineNo">113</span> /**<a name="line.113"></a>
-<span class="sourceLineNo">114</span> * No operation for the shutdown in the memory IO engine<a name="line.114"></a>
-<span class="sourceLineNo">115</span> */<a name="line.115"></a>
-<span class="sourceLineNo">116</span> @Override<a name="line.116"></a>
-<span class="sourceLineNo">117</span> public void shutdown() {<a name="line.117"></a>
-<span class="sourceLineNo">118</span> // Nothing to do.<a name="line.118"></a>
-<span class="sourceLineNo">119</span> }<a name="line.119"></a>
-<span class="sourceLineNo">120</span>}<a name="line.120"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.util.ByteBufferAllocator;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.util.ByteBufferArray;<a name="line.30"></a>
+<span class="sourceLineNo">031</span><a name="line.31"></a>
+<span class="sourceLineNo">032</span>/**<a name="line.32"></a>
+<span class="sourceLineNo">033</span> * IO engine that stores data in memory using an array of ByteBuffers<a name="line.33"></a>
+<span class="sourceLineNo">034</span> * {@link ByteBufferArray}<a name="line.34"></a>
+<span class="sourceLineNo">035</span> */<a name="line.35"></a>
+<span class="sourceLineNo">036</span>@InterfaceAudience.Private<a name="line.36"></a>
+<span class="sourceLineNo">037</span>public class ByteBufferIOEngine implements IOEngine {<a name="line.37"></a>
+<span class="sourceLineNo">038</span> private ByteBufferArray bufferArray;<a name="line.38"></a>
+<span class="sourceLineNo">039</span> private final long capacity;<a name="line.39"></a>
+<span class="sourceLineNo">040</span> private final boolean direct;<a name="line.40"></a>
+<span class="sourceLineNo">041</span><a name="line.41"></a>
+<span class="sourceLineNo">042</span> /**<a name="line.42"></a>
+<span class="sourceLineNo">043</span> * Construct the ByteBufferIOEngine with the given capacity<a name="line.43"></a>
+<span class="sourceLineNo">044</span> * @param capacity<a name="line.44"></a>
+<span class="sourceLineNo">045</span> * @param direct true if allocate direct buffer<a name="line.45"></a>
+<span class="sourceLineNo">046</span> * @throws IOException ideally here no exception to be thrown from the allocator<a name="line.46"></a>
+<span class="sourceLineNo">047</span> */<a name="line.47"></a>
+<span class="sourceLineNo">048</span> public ByteBufferIOEngine(long capacity, boolean direct)<a name="line.48"></a>
+<span class="sourceLineNo">049</span> throws IOException {<a name="line.49"></a>
+<span class="sourceLineNo">050</span> this.capacity = capacity;<a name="line.50"></a>
+<span class="sourceLineNo">051</span> this.direct = direct;<a name="line.51"></a>
+<span class="sourceLineNo">052</span> ByteBufferAllocator allocator = new ByteBufferAllocator() {<a name="line.52"></a>
+<span class="sourceLineNo">053</span> @Override<a name="line.53"></a>
+<span class="sourceLineNo">054</span> public ByteBuffer allocate(long size, boolean directByteBuffer)<a name="line.54"></a>
+<span class="sourceLineNo">055</span> throws IOException {<a name="line.55"></a>
+<span class="sourceLineNo">056</span> if (directByteBuffer) {<a name="line.56"></a>
+<span class="sourceLineNo">057</span> return ByteBuffer.allocateDirect((int) size);<a name="line.57"></a>
+<span class="sourceLineNo">058</span> } else {<a name="line.58"></a>
+<span class="sourceLineNo">059</span> return ByteBuffer.allocate((int) size);<a name="line.59"></a>
+<span class="sourceLineNo">060</span> }<a name="line.60"></a>
+<span class="sourceLineNo">061</span> }<a name="line.61"></a>
+<span class="sourceLineNo">062</span> };<a name="line.62"></a>
+<span class="sourceLineNo">063</span> bufferArray = new ByteBufferArray(capacity, direct, allocator);<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> @Override<a name="line.66"></a>
+<span class="sourceLineNo">067</span> public String toString() {<a name="line.67"></a>
+<span class="sourceLineNo">068</span> return "ioengine=" + this.getClass().getSimpleName() + ", capacity=" +<a name="line.68"></a>
+<span class="sourceLineNo">069</span> String.format("%,d", this.capacity) + ", direct=" + this.direct;<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> /**<a name="line.72"></a>
+<span class="sourceLineNo">073</span> * Memory IO engine is always unable to support persistent storage for the<a name="line.73"></a>
+<span class="sourceLineNo">074</span> * cache<a name="line.74"></a>
+<span class="sourceLineNo">075</span> * @return false<a name="line.75"></a>
+<span class="sourceLineNo">076</span> */<a name="line.76"></a>
+<span class="sourceLineNo">077</span> @Override<a name="line.77"></a>
+<span class="sourceLineNo">078</span> public boolean isPersistent() {<a name="line.78"></a>
+<span class="sourceLineNo">079</span> return false;<a name="line.79"></a>
+<span class="sourceLineNo">080</span> }<a name="line.80"></a>
+<span class="sourceLineNo">081</span><a name="line.81"></a>
+<span class="sourceLineNo">082</span> @Override<a name="line.82"></a>
+<span class="sourceLineNo">083</span> public Cacheable read(long offset, int length, CacheableDeserializer<Cacheable> deserializer)<a name="line.83"></a>
+<span class="sourceLineNo">084</span> throws IOException {<a name="line.84"></a>
+<span class="sourceLineNo">085</span> ByteBuff dstBuffer = bufferArray.asSubByteBuff(offset, length);<a name="line.85"></a>
+<span class="sourceLineNo">086</span> // Here the buffer that is created directly refers to the buffer in the actual buckets.<a name="line.86"></a>
+<span class="sourceLineNo">087</span> // When any cell is referring to the blocks created out of these buckets then it means that<a name="line.87"></a>
+<span class="sourceLineNo">088</span> // those cells are referring to a shared memory area which if evicted by the BucketCache would<a name="line.88"></a>
+<span class="sourceLineNo">089</span> // lead to corruption of results. Hence we set the type of the buffer as SHARED_MEMORY<a name="line.89"></a>
+<span class="sourceLineNo">090</span> // so that the readers using this block are aware of this fact and do the necessary action<a name="line.90"></a>
+<span class="sourceLineNo">091</span> // to prevent eviction till the results are either consumed or copied<a name="line.91"></a>
+<span class="sourceLineNo">092</span> return deserializer.deserialize(dstBuffer, true, MemoryType.SHARED);<a name="line.92"></a>
+<span class="sourceLineNo">093</span> }<a name="line.93"></a>
+<span class="sourceLineNo">094</span><a name="line.94"></a>
+<span class="sourceLineNo">095</span> /**<a name="line.95"></a>
+<span class="sourceLineNo">096</span> * Transfers data from the given byte buffer to the buffer array<a name="line.96"></a>
+<span class="sourceLineNo">097</span> * @param srcBuffer the given byte buffer from which bytes are to be read<a name="line.97"></a>
+<span class="sourceLineNo">098</span> * @param offset The offset in the ByteBufferArray of the first byte to be<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * written<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * @throws IOException throws IOException if writing to the array throws exception<a name="line.100"></a>
+<span class="sourceLineNo">101</span> */<a name="line.101"></a>
+<span class="sourceLineNo">102</span> @Override<a name="line.102"></a>
+<span class="sourceLineNo">103</span> public void write(ByteBuffer srcBuffer, long offset) throws IOException {<a name="line.103"></a>
+<span class="sourceLineNo">104</span> assert srcBuffer.hasArray();<a name="line.104"></a>
+<span class="sourceLineNo">105</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.105"></a>
+<span class="sourceLineNo">106</span> srcBuffer.arrayOffset());<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> @Override<a name="line.109"></a>
+<span class="sourceLineNo">110</span> public void write(ByteBuff srcBuffer, long offset) throws IOException {<a name="line.110"></a>
+<span class="sourceLineNo">111</span> // When caching block into BucketCache there will be single buffer backing for this HFileBlock.<a name="line.111"></a>
+<span class="sourceLineNo">112</span> // This will work for now. But from the DFS itself if we get DBB then this may not hold true.<a name="line.112"></a>
+<span class="sourceLineNo">113</span> assert srcBuffer.hasArray();<a name="line.113"></a>
+<span class="sourceLineNo">114</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.114"></a>
+<span class="sourceLineNo">115</span> srcBuffer.arrayOffset());<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> * No operation for the sync in the memory IO engine<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 sync() {<a name="line.121"></a>
+<span class="sourceLineNo">122</span> // Nothing to do.<a name="line.122"></a>
+<span class="sourceLineNo">123</span> }<a name="line.123"></a>
+<span class="sourceLineNo">124</span><a name="line.124"></a>
+<span class="sourceLineNo">125</span> /**<a name="line.125"></a>
+<span class="sourceLineNo">126</span> * No operation for the shutdown in the memory IO engine<a name="line.126"></a>
+<span class="sourceLineNo">127</span> */<a name="line.127"></a>
+<span class="sourceLineNo">128</span> @Override<a name="line.128"></a>
+<span class="sourceLineNo">129</span> public void shutdown() {<a name="line.129"></a>
+<span class="sourceLineNo">130</span> // Nothing to do.<a name="line.130"></a>
+<span class="sourceLineNo">131</span> }<a name="line.131"></a>
+<span class="sourceLineNo">132</span>}<a name="line.132"></a>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/d02dd5db/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileMmapEngine.html
----------------------------------------------------------------------
diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileMmapEngine.html b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileMmapEngine.html
new file mode 100644
index 0000000..14d90dc
--- /dev/null
+++ b/devapidocs/src-html/org/apache/hadoop/hbase/io/hfile/bucket/FileMmapEngine.html
@@ -0,0 +1,238 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html lang="en">
+<head>
+<title>Source code</title>
+<link rel="stylesheet" type="text/css" href="../../../../../../../../stylesheet.css" title="Style">
+</head>
+<body>
+<div class="sourceContainer">
+<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
+<span class="sourceLineNo">002</span> * Copyright The Apache Software Foundation<a name="line.2"></a>
+<span class="sourceLineNo">003</span> *<a name="line.3"></a>
+<span class="sourceLineNo">004</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.4"></a>
+<span class="sourceLineNo">005</span> * contributor license agreements. See the NOTICE file distributed with this<a name="line.5"></a>
+<span class="sourceLineNo">006</span> * work for additional information regarding copyright ownership. The ASF<a name="line.6"></a>
+<span class="sourceLineNo">007</span> * licenses this file to you under the Apache License, Version 2.0 (the<a name="line.7"></a>
+<span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance with the License.<a name="line.8"></a>
+<span class="sourceLineNo">009</span> * You may obtain a copy of the License at<a name="line.9"></a>
+<span class="sourceLineNo">010</span> *<a name="line.10"></a>
+<span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a>
+<span class="sourceLineNo">012</span> *<a name="line.12"></a>
+<span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a>
+<span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT<a name="line.14"></a>
+<span class="sourceLineNo">015</span> * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the<a name="line.15"></a>
+<span class="sourceLineNo">016</span> * License for the specific language governing permissions and limitations<a name="line.16"></a>
+<span class="sourceLineNo">017</span> * under the License.<a name="line.17"></a>
+<span class="sourceLineNo">018</span> */<a name="line.18"></a>
+<span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.io.hfile.bucket;<a name="line.19"></a>
+<span class="sourceLineNo">020</span><a name="line.20"></a>
+<span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a>
+<span class="sourceLineNo">022</span>import java.io.RandomAccessFile;<a name="line.22"></a>
+<span class="sourceLineNo">023</span>import java.nio.ByteBuffer;<a name="line.23"></a>
+<span class="sourceLineNo">024</span>import java.nio.channels.FileChannel;<a name="line.24"></a>
+<span class="sourceLineNo">025</span><a name="line.25"></a>
+<span class="sourceLineNo">026</span>import org.apache.commons.logging.Log;<a name="line.26"></a>
+<span class="sourceLineNo">027</span>import org.apache.commons.logging.LogFactory;<a name="line.27"></a>
+<span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.28"></a>
+<span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.io.hfile.Cacheable;<a name="line.29"></a>
+<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.io.hfile.Cacheable.MemoryType;<a name="line.30"></a>
+<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.io.hfile.CacheableDeserializer;<a name="line.31"></a>
+<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.nio.ByteBuff;<a name="line.32"></a>
+<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.nio.SingleByteBuff;<a name="line.33"></a>
+<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.util.ByteBufferAllocator;<a name="line.34"></a>
+<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.ByteBufferArray;<a name="line.35"></a>
+<span class="sourceLineNo">036</span>import org.apache.hadoop.util.StringUtils;<a name="line.36"></a>
+<span class="sourceLineNo">037</span><a name="line.37"></a>
+<span class="sourceLineNo">038</span>/**<a name="line.38"></a>
+<span class="sourceLineNo">039</span> * IO engine that stores data to a file on the local file system using memory mapping<a name="line.39"></a>
+<span class="sourceLineNo">040</span> * mechanism<a name="line.40"></a>
+<span class="sourceLineNo">041</span> */<a name="line.41"></a>
+<span class="sourceLineNo">042</span>@InterfaceAudience.Private<a name="line.42"></a>
+<span class="sourceLineNo">043</span>public class FileMmapEngine implements IOEngine {<a name="line.43"></a>
+<span class="sourceLineNo">044</span> static final Log LOG = LogFactory.getLog(FileMmapEngine.class);<a name="line.44"></a>
+<span class="sourceLineNo">045</span><a name="line.45"></a>
+<span class="sourceLineNo">046</span> private final String path;<a name="line.46"></a>
+<span class="sourceLineNo">047</span> private long size;<a name="line.47"></a>
+<span class="sourceLineNo">048</span> private ByteBufferArray bufferArray;<a name="line.48"></a>
+<span class="sourceLineNo">049</span> private final FileChannel fileChannel;<a name="line.49"></a>
+<span class="sourceLineNo">050</span> private RandomAccessFile raf = null;<a name="line.50"></a>
+<span class="sourceLineNo">051</span><a name="line.51"></a>
+<span class="sourceLineNo">052</span> public FileMmapEngine(String filePath, long capacity) throws IOException {<a name="line.52"></a>
+<span class="sourceLineNo">053</span> this.path = filePath;<a name="line.53"></a>
+<span class="sourceLineNo">054</span> this.size = capacity;<a name="line.54"></a>
+<span class="sourceLineNo">055</span> long fileSize = 0;<a name="line.55"></a>
+<span class="sourceLineNo">056</span> try {<a name="line.56"></a>
+<span class="sourceLineNo">057</span> raf = new RandomAccessFile(filePath, "rw");<a name="line.57"></a>
+<span class="sourceLineNo">058</span> fileSize = roundUp(capacity, ByteBufferArray.DEFAULT_BUFFER_SIZE);<a name="line.58"></a>
+<span class="sourceLineNo">059</span> raf.setLength(fileSize);<a name="line.59"></a>
+<span class="sourceLineNo">060</span> fileChannel = raf.getChannel();<a name="line.60"></a>
+<span class="sourceLineNo">061</span> LOG.info("Allocating " + StringUtils.byteDesc(fileSize) + ", on the path:" + filePath);<a name="line.61"></a>
+<span class="sourceLineNo">062</span> } catch (java.io.FileNotFoundException fex) {<a name="line.62"></a>
+<span class="sourceLineNo">063</span> LOG.error("Can't create bucket cache file " + filePath, fex);<a name="line.63"></a>
+<span class="sourceLineNo">064</span> throw fex;<a name="line.64"></a>
+<span class="sourceLineNo">065</span> } catch (IOException ioex) {<a name="line.65"></a>
+<span class="sourceLineNo">066</span> LOG.error("Can't extend bucket cache file; insufficient space for "<a name="line.66"></a>
+<span class="sourceLineNo">067</span> + StringUtils.byteDesc(fileSize), ioex);<a name="line.67"></a>
+<span class="sourceLineNo">068</span> shutdown();<a name="line.68"></a>
+<span class="sourceLineNo">069</span> throw ioex;<a name="line.69"></a>
+<span class="sourceLineNo">070</span> }<a name="line.70"></a>
+<span class="sourceLineNo">071</span> ByteBufferAllocator allocator = new ByteBufferAllocator() {<a name="line.71"></a>
+<span class="sourceLineNo">072</span> int pos = 0;<a name="line.72"></a>
+<span class="sourceLineNo">073</span> @Override<a name="line.73"></a>
+<span class="sourceLineNo">074</span> public ByteBuffer allocate(long size, boolean directByteBuffer) throws IOException {<a name="line.74"></a>
+<span class="sourceLineNo">075</span> ByteBuffer buffer = null;<a name="line.75"></a>
+<span class="sourceLineNo">076</span> if (directByteBuffer) {<a name="line.76"></a>
+<span class="sourceLineNo">077</span> buffer = fileChannel.map(java.nio.channels.FileChannel.MapMode.READ_WRITE, pos * size,<a name="line.77"></a>
+<span class="sourceLineNo">078</span> size);<a name="line.78"></a>
+<span class="sourceLineNo">079</span> } else {<a name="line.79"></a>
+<span class="sourceLineNo">080</span> throw new IllegalArgumentException(<a name="line.80"></a>
+<span class="sourceLineNo">081</span> "Only Direct Bytebuffers allowed with FileMMap engine");<a name="line.81"></a>
+<span class="sourceLineNo">082</span> }<a name="line.82"></a>
+<span class="sourceLineNo">083</span> pos++;<a name="line.83"></a>
+<span class="sourceLineNo">084</span> return buffer;<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> bufferArray = new ByteBufferArray(fileSize, true, allocator);<a name="line.87"></a>
+<span class="sourceLineNo">088</span> }<a name="line.88"></a>
+<span class="sourceLineNo">089</span><a name="line.89"></a>
+<span class="sourceLineNo">090</span> private long roundUp(long n, long to) {<a name="line.90"></a>
+<span class="sourceLineNo">091</span> return ((n + to - 1) / to) * to;<a name="line.91"></a>
+<span class="sourceLineNo">092</span> }<a name="line.92"></a>
+<span class="sourceLineNo">093</span><a name="line.93"></a>
+<span class="sourceLineNo">094</span> @Override<a name="line.94"></a>
+<span class="sourceLineNo">095</span> public String toString() {<a name="line.95"></a>
+<span class="sourceLineNo">096</span> return "ioengine=" + this.getClass().getSimpleName() + ", path=" + this.path +<a name="line.96"></a>
+<span class="sourceLineNo">097</span> ", size=" + String.format("%,d", this.size);<a name="line.97"></a>
+<span class="sourceLineNo">098</span> }<a name="line.98"></a>
+<span class="sourceLineNo">099</span><a name="line.99"></a>
+<span class="sourceLineNo">100</span> /**<a name="line.100"></a>
+<span class="sourceLineNo">101</span> * File IO engine is always able to support persistent storage for the cache<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * @return true<a name="line.102"></a>
+<span class="sourceLineNo">103</span> */<a name="line.103"></a>
+<span class="sourceLineNo">104</span> @Override<a name="line.104"></a>
+<span class="sourceLineNo">105</span> public boolean isPersistent() {<a name="line.105"></a>
+<span class="sourceLineNo">106</span> return true;<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> @Override<a name="line.109"></a>
+<span class="sourceLineNo">110</span> public Cacheable read(long offset, int length, CacheableDeserializer<Cacheable> deserializer)<a name="line.110"></a>
+<span class="sourceLineNo">111</span> throws IOException {<a name="line.111"></a>
+<span class="sourceLineNo">112</span> byte[] dst = new byte[length];<a name="line.112"></a>
+<span class="sourceLineNo">113</span> bufferArray.getMultiple(offset, length, dst);<a name="line.113"></a>
+<span class="sourceLineNo">114</span> return deserializer.deserialize(new SingleByteBuff(ByteBuffer.wrap(dst)), true,<a name="line.114"></a>
+<span class="sourceLineNo">115</span> MemoryType.EXCLUSIVE);<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> * Transfers data from the given byte buffer to file<a name="line.119"></a>
+<span class="sourceLineNo">120</span> * @param srcBuffer the given byte buffer from which bytes are to be read<a name="line.120"></a>
+<span class="sourceLineNo">121</span> * @param offset The offset in the file where the first byte to be written<a name="line.121"></a>
+<span class="sourceLineNo">122</span> * @throws IOException<a name="line.122"></a>
+<span class="sourceLineNo">123</span> */<a name="line.123"></a>
+<span class="sourceLineNo">124</span> @Override<a name="line.124"></a>
+<span class="sourceLineNo">125</span> public void write(ByteBuffer srcBuffer, long offset) throws IOException {<a name="line.125"></a>
+<span class="sourceLineNo">126</span> assert srcBuffer.hasArray();<a name="line.126"></a>
+<span class="sourceLineNo">127</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.127"></a>
+<span class="sourceLineNo">128</span> srcBuffer.arrayOffset());<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 void write(ByteBuff srcBuffer, long offset) throws IOException {<a name="line.132"></a>
+<span class="sourceLineNo">133</span> // This singleByteBuff can be considered to be array backed<a name="line.133"></a>
+<span class="sourceLineNo">134</span> assert srcBuffer.hasArray();<a name="line.134"></a>
+<span class="sourceLineNo">135</span> bufferArray.putMultiple(offset, srcBuffer.remaining(), srcBuffer.array(),<a name="line.135"></a>
+<span class="sourceLineNo">136</span> srcBuffer.arrayOffset());<a name="line.136"></a>
+<span class="sourceLineNo">137</span><a name="line.137"></a>
+<span class="sourceLineNo">138</span> }<a name="line.138"></a>
+<span class="sourceLineNo">139</span> /**<a name="line.139"></a>
+<span class="sourceLineNo">140</span> * Sync the data to file after writing<a name="line.140"></a>
+<span class="sourceLineNo">141</span> * @throws IOException<a name="line.141"></a>
+<span class="sourceLineNo">142</span> */<a name="line.142"></a>
+<span class="sourceLineNo">143</span> @Override<a name="line.143"></a>
+<span class="sourceLineNo">144</span> public void sync() throws IOException {<a name="line.144"></a>
+<span class="sourceLineNo">145</span> if (fileChannel != null) {<a name="line.145"></a>
+<span class="sourceLineNo">146</span> fileChannel.force(true);<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> /**<a name="line.150"></a>
+<span class="sourceLineNo">151</span> * Close the file<a name="line.151"></a>
+<span class="sourceLineNo">152</span> */<a name="line.152"></a>
+<span class="sourceLineNo">153</span> @Override<a name="line.153"></a>
+<span class="sourceLineNo">154</span> public void shutdown() {<a name="line.154"></a>
+<span class="sourceLineNo">155</span> try {<a name="line.155"></a>
+<span class="sourceLineNo">156</span> fileChannel.close();<a name="line.156"></a>
+<span class="sourceLineNo">157</span> } catch (IOException ex) {<a name="line.157"></a>
+<span class="sourceLineNo">158</span> LOG.error("Can't shutdown cleanly", ex);<a name="line.158"></a>
+<span class="sourceLineNo">159</span> }<a name="line.159"></a>
+<span class="sourceLineNo">160</span> try {<a name="line.160"></a>
+<span class="sourceLineNo">161</span> raf.close();<a name="line.161"></a>
+<span class="sourceLineNo">162</span> } catch (IOException ex) {<a name="line.162"></a>
+<span class="sourceLineNo">163</span> LOG.error("Can't shutdown cleanly", ex);<a name="line.163"></a>
+<span class="sourceLineNo">164</span> }<a name="line.164"></a>
+<span class="sourceLineNo">165</span> }<a name="line.165"></a>
+<span class="sourceLineNo">166</span>}<a name="line.166"></a>
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+</pre>
+</div>
+</body>
+</html>