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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.wal;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import java.io.IOException;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.ArrayList;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.List;</span> |
| <span class="source-line-no">023</span><span id="line-23">import java.util.Map;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.Set;</span> |
| <span class="source-line-no">025</span><span id="line-25">import java.util.TreeMap;</span> |
| <span class="source-line-no">026</span><span id="line-26">import java.util.TreeSet;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.TableName;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.io.HeapSize;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.hadoop.hbase.util.ClassSize;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.apache.hadoop.hbase.wal.WALSplitter.PipelineController;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">033</span><span id="line-33">import org.slf4j.Logger;</span> |
| <span class="source-line-no">034</span><span id="line-34">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">035</span><span id="line-35"></span> |
| <span class="source-line-no">036</span><span id="line-36">/**</span> |
| <span class="source-line-no">037</span><span id="line-37"> * Class which accumulates edits and separates them into a buffer per region while simultaneously</span> |
| <span class="source-line-no">038</span><span id="line-38"> * accounting RAM usage. Blocks if the RAM usage crosses a predefined threshold. Writer threads then</span> |
| <span class="source-line-no">039</span><span id="line-39"> * pull region-specific buffers from this class.</span> |
| <span class="source-line-no">040</span><span id="line-40"> */</span> |
| <span class="source-line-no">041</span><span id="line-41">@InterfaceAudience.Private</span> |
| <span class="source-line-no">042</span><span id="line-42">class EntryBuffers {</span> |
| <span class="source-line-no">043</span><span id="line-43"> private static final Logger LOG = LoggerFactory.getLogger(EntryBuffers.class);</span> |
| <span class="source-line-no">044</span><span id="line-44"></span> |
| <span class="source-line-no">045</span><span id="line-45"> private final PipelineController controller;</span> |
| <span class="source-line-no">046</span><span id="line-46"></span> |
| <span class="source-line-no">047</span><span id="line-47"> final Map<byte[], RegionEntryBuffer> buffers = new TreeMap<>(Bytes.BYTES_COMPARATOR);</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49"> /*</span> |
| <span class="source-line-no">050</span><span id="line-50"> * Track which regions are currently in the middle of writing. We don't allow an IO thread to pick</span> |
| <span class="source-line-no">051</span><span id="line-51"> * up bytes from a region if we're already writing data for that region in a different IO thread.</span> |
| <span class="source-line-no">052</span><span id="line-52"> */</span> |
| <span class="source-line-no">053</span><span id="line-53"> private final Set<byte[]> currentlyWriting = new TreeSet<>(Bytes.BYTES_COMPARATOR);</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> protected long totalBuffered = 0;</span> |
| <span class="source-line-no">056</span><span id="line-56"> protected final long maxHeapUsage;</span> |
| <span class="source-line-no">057</span><span id="line-57"></span> |
| <span class="source-line-no">058</span><span id="line-58"> public EntryBuffers(PipelineController controller, long maxHeapUsage) {</span> |
| <span class="source-line-no">059</span><span id="line-59"> this.controller = controller;</span> |
| <span class="source-line-no">060</span><span id="line-60"> this.maxHeapUsage = maxHeapUsage;</span> |
| <span class="source-line-no">061</span><span id="line-61"> }</span> |
| <span class="source-line-no">062</span><span id="line-62"></span> |
| <span class="source-line-no">063</span><span id="line-63"> /**</span> |
| <span class="source-line-no">064</span><span id="line-64"> * Append a log entry into the corresponding region buffer. Blocks if the total heap usage has</span> |
| <span class="source-line-no">065</span><span id="line-65"> * crossed the specified threshold.</span> |
| <span class="source-line-no">066</span><span id="line-66"> */</span> |
| <span class="source-line-no">067</span><span id="line-67"> void appendEntry(WAL.Entry entry) throws InterruptedException, IOException {</span> |
| <span class="source-line-no">068</span><span id="line-68"> WALKey key = entry.getKey();</span> |
| <span class="source-line-no">069</span><span id="line-69"> RegionEntryBuffer buffer;</span> |
| <span class="source-line-no">070</span><span id="line-70"> long incrHeap;</span> |
| <span class="source-line-no">071</span><span id="line-71"> synchronized (this) {</span> |
| <span class="source-line-no">072</span><span id="line-72"> buffer = buffers.get(key.getEncodedRegionName());</span> |
| <span class="source-line-no">073</span><span id="line-73"> if (buffer == null) {</span> |
| <span class="source-line-no">074</span><span id="line-74"> buffer = new RegionEntryBuffer(key.getTableName(), key.getEncodedRegionName());</span> |
| <span class="source-line-no">075</span><span id="line-75"> buffers.put(key.getEncodedRegionName(), buffer);</span> |
| <span class="source-line-no">076</span><span id="line-76"> }</span> |
| <span class="source-line-no">077</span><span id="line-77"> incrHeap = buffer.appendEntry(entry);</span> |
| <span class="source-line-no">078</span><span id="line-78"> }</span> |
| <span class="source-line-no">079</span><span id="line-79"></span> |
| <span class="source-line-no">080</span><span id="line-80"> // If we crossed the chunk threshold, wait for more space to be available</span> |
| <span class="source-line-no">081</span><span id="line-81"> synchronized (controller.dataAvailable) {</span> |
| <span class="source-line-no">082</span><span id="line-82"> totalBuffered += incrHeap;</span> |
| <span class="source-line-no">083</span><span id="line-83"> while (totalBuffered > maxHeapUsage && controller.thrown.get() == null) {</span> |
| <span class="source-line-no">084</span><span id="line-84"> LOG.debug("Used {} bytes of buffered edits, waiting for IO threads", totalBuffered);</span> |
| <span class="source-line-no">085</span><span id="line-85"> controller.dataAvailable.wait(2000);</span> |
| <span class="source-line-no">086</span><span id="line-86"> }</span> |
| <span class="source-line-no">087</span><span id="line-87"> controller.dataAvailable.notifyAll();</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</span> |
| <span class="source-line-no">089</span><span id="line-89"> controller.checkForErrors();</span> |
| <span class="source-line-no">090</span><span id="line-90"> }</span> |
| <span class="source-line-no">091</span><span id="line-91"></span> |
| <span class="source-line-no">092</span><span id="line-92"> /** Returns RegionEntryBuffer a buffer of edits to be written. */</span> |
| <span class="source-line-no">093</span><span id="line-93"> synchronized RegionEntryBuffer getChunkToWrite() {</span> |
| <span class="source-line-no">094</span><span id="line-94"> long biggestSize = 0;</span> |
| <span class="source-line-no">095</span><span id="line-95"> byte[] biggestBufferKey = null;</span> |
| <span class="source-line-no">096</span><span id="line-96"></span> |
| <span class="source-line-no">097</span><span id="line-97"> for (Map.Entry<byte[], RegionEntryBuffer> entry : buffers.entrySet()) {</span> |
| <span class="source-line-no">098</span><span id="line-98"> long size = entry.getValue().heapSize();</span> |
| <span class="source-line-no">099</span><span id="line-99"> if (size > biggestSize && (!currentlyWriting.contains(entry.getKey()))) {</span> |
| <span class="source-line-no">100</span><span id="line-100"> biggestSize = size;</span> |
| <span class="source-line-no">101</span><span id="line-101"> biggestBufferKey = entry.getKey();</span> |
| <span class="source-line-no">102</span><span id="line-102"> }</span> |
| <span class="source-line-no">103</span><span id="line-103"> }</span> |
| <span class="source-line-no">104</span><span id="line-104"> if (biggestBufferKey == null) {</span> |
| <span class="source-line-no">105</span><span id="line-105"> return null;</span> |
| <span class="source-line-no">106</span><span id="line-106"> }</span> |
| <span class="source-line-no">107</span><span id="line-107"></span> |
| <span class="source-line-no">108</span><span id="line-108"> RegionEntryBuffer buffer = buffers.remove(biggestBufferKey);</span> |
| <span class="source-line-no">109</span><span id="line-109"> currentlyWriting.add(biggestBufferKey);</span> |
| <span class="source-line-no">110</span><span id="line-110"> return buffer;</span> |
| <span class="source-line-no">111</span><span id="line-111"> }</span> |
| <span class="source-line-no">112</span><span id="line-112"></span> |
| <span class="source-line-no">113</span><span id="line-113"> void doneWriting(RegionEntryBuffer buffer) {</span> |
| <span class="source-line-no">114</span><span id="line-114"> synchronized (this) {</span> |
| <span class="source-line-no">115</span><span id="line-115"> boolean removed = currentlyWriting.remove(buffer.encodedRegionName);</span> |
| <span class="source-line-no">116</span><span id="line-116"> assert removed;</span> |
| <span class="source-line-no">117</span><span id="line-117"> }</span> |
| <span class="source-line-no">118</span><span id="line-118"> long size = buffer.heapSize();</span> |
| <span class="source-line-no">119</span><span id="line-119"></span> |
| <span class="source-line-no">120</span><span id="line-120"> synchronized (controller.dataAvailable) {</span> |
| <span class="source-line-no">121</span><span id="line-121"> totalBuffered -= size;</span> |
| <span class="source-line-no">122</span><span id="line-122"> // We may unblock writers</span> |
| <span class="source-line-no">123</span><span id="line-123"> controller.dataAvailable.notifyAll();</span> |
| <span class="source-line-no">124</span><span id="line-124"> }</span> |
| <span class="source-line-no">125</span><span id="line-125"> }</span> |
| <span class="source-line-no">126</span><span id="line-126"></span> |
| <span class="source-line-no">127</span><span id="line-127"> synchronized boolean isRegionCurrentlyWriting(byte[] region) {</span> |
| <span class="source-line-no">128</span><span id="line-128"> return currentlyWriting.contains(region);</span> |
| <span class="source-line-no">129</span><span id="line-129"> }</span> |
| <span class="source-line-no">130</span><span id="line-130"></span> |
| <span class="source-line-no">131</span><span id="line-131"> /**</span> |
| <span class="source-line-no">132</span><span id="line-132"> * A buffer of some number of edits for a given region. This accumulates edits and also provides a</span> |
| <span class="source-line-no">133</span><span id="line-133"> * memory optimization in order to share a single byte array instance for the table and region</span> |
| <span class="source-line-no">134</span><span id="line-134"> * name. Also tracks memory usage of the accumulated edits.</span> |
| <span class="source-line-no">135</span><span id="line-135"> */</span> |
| <span class="source-line-no">136</span><span id="line-136"> static class RegionEntryBuffer implements HeapSize {</span> |
| <span class="source-line-no">137</span><span id="line-137"> private long heapInBuffer = 0;</span> |
| <span class="source-line-no">138</span><span id="line-138"> final List<WAL.Entry> entryBuffer;</span> |
| <span class="source-line-no">139</span><span id="line-139"> final TableName tableName;</span> |
| <span class="source-line-no">140</span><span id="line-140"> final byte[] encodedRegionName;</span> |
| <span class="source-line-no">141</span><span id="line-141"></span> |
| <span class="source-line-no">142</span><span id="line-142"> RegionEntryBuffer(TableName tableName, byte[] region) {</span> |
| <span class="source-line-no">143</span><span id="line-143"> this.tableName = tableName;</span> |
| <span class="source-line-no">144</span><span id="line-144"> this.encodedRegionName = region;</span> |
| <span class="source-line-no">145</span><span id="line-145"> this.entryBuffer = new ArrayList<>();</span> |
| <span class="source-line-no">146</span><span id="line-146"> }</span> |
| <span class="source-line-no">147</span><span id="line-147"></span> |
| <span class="source-line-no">148</span><span id="line-148"> long appendEntry(WAL.Entry entry) {</span> |
| <span class="source-line-no">149</span><span id="line-149"> internify(entry);</span> |
| <span class="source-line-no">150</span><span id="line-150"> entryBuffer.add(entry);</span> |
| <span class="source-line-no">151</span><span id="line-151"> // TODO linkedlist entry</span> |
| <span class="source-line-no">152</span><span id="line-152"> // entry size plus WALKey pointers</span> |
| <span class="source-line-no">153</span><span id="line-153"> long incrHeap = entry.getEdit().heapSize() + ClassSize.align(2 * ClassSize.REFERENCE);</span> |
| <span class="source-line-no">154</span><span id="line-154"> heapInBuffer += incrHeap;</span> |
| <span class="source-line-no">155</span><span id="line-155"> return incrHeap;</span> |
| <span class="source-line-no">156</span><span id="line-156"> }</span> |
| <span class="source-line-no">157</span><span id="line-157"></span> |
| <span class="source-line-no">158</span><span id="line-158"> private void internify(WAL.Entry entry) {</span> |
| <span class="source-line-no">159</span><span id="line-159"> WALKeyImpl k = entry.getKey();</span> |
| <span class="source-line-no">160</span><span id="line-160"> k.internTableName(this.tableName);</span> |
| <span class="source-line-no">161</span><span id="line-161"> k.internEncodedRegionName(this.encodedRegionName);</span> |
| <span class="source-line-no">162</span><span id="line-162"> }</span> |
| <span class="source-line-no">163</span><span id="line-163"></span> |
| <span class="source-line-no">164</span><span id="line-164"> @Override</span> |
| <span class="source-line-no">165</span><span id="line-165"> public long heapSize() {</span> |
| <span class="source-line-no">166</span><span id="line-166"> return heapInBuffer;</span> |
| <span class="source-line-no">167</span><span id="line-167"> }</span> |
| <span class="source-line-no">168</span><span id="line-168"></span> |
| <span class="source-line-no">169</span><span id="line-169"> public byte[] getEncodedRegionName() {</span> |
| <span class="source-line-no">170</span><span id="line-170"> return encodedRegionName;</span> |
| <span class="source-line-no">171</span><span id="line-171"> }</span> |
| <span class="source-line-no">172</span><span id="line-172"></span> |
| <span class="source-line-no">173</span><span id="line-173"> public TableName getTableName() {</span> |
| <span class="source-line-no">174</span><span id="line-174"> return tableName;</span> |
| <span class="source-line-no">175</span><span id="line-175"> }</span> |
| <span class="source-line-no">176</span><span id="line-176"> }</span> |
| <span class="source-line-no">177</span><span id="line-177">}</span> |
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| </pre> |
| </div> |
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