http://git-wip-us.apache.org/repos/asf/hbase-site/blob/1d9053bc/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/WriteHeavyIncrementObserver.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/WriteHeavyIncrementObserver.html b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/WriteHeavyIncrementObserver.html new file mode 100644 index 0000000..7a201e0 --- /dev/null +++ b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/WriteHeavyIncrementObserver.html @@ -0,0 +1,324 @@ +<!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.coprocessor.example;<a name="line.18"></a> +<span class="sourceLineNo">019</span><a name="line.19"></a> +<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a> +<span class="sourceLineNo">021</span>import java.math.RoundingMode;<a name="line.21"></a> +<span class="sourceLineNo">022</span>import java.util.ArrayList;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.util.List;<a name="line.23"></a> +<span class="sourceLineNo">024</span>import java.util.Map;<a name="line.24"></a> +<span class="sourceLineNo">025</span>import java.util.NavigableMap;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import java.util.Optional;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import java.util.TreeMap;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import java.util.stream.IntStream;<a name="line.28"></a> +<span class="sourceLineNo">029</span><a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.commons.lang3.mutable.MutableLong;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.Cell;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.CellBuilder;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.CellBuilderFactory;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.CellBuilderType;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.HConstants;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.client.Get;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.client.Increment;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.client.Put;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.client.Result;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.coprocessor.ObserverContext;<a name="line.42"></a> +<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;<a name="line.43"></a> +<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;<a name="line.44"></a> +<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.coprocessor.RegionObserver;<a name="line.45"></a> +<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker;<a name="line.46"></a> +<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.regionserver.InternalScanner;<a name="line.47"></a> +<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.regionserver.RegionScanner;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.regionserver.ScanOptions;<a name="line.49"></a> +<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.regionserver.ScanType;<a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.regionserver.ScannerContext;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.regionserver.Store;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;<a name="line.54"></a> +<span class="sourceLineNo">055</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.55"></a> +<span class="sourceLineNo">056</span><a name="line.56"></a> +<span class="sourceLineNo">057</span>import org.apache.hadoop.hbase.shaded.com.google.common.math.IntMath;<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> * An example for implementing a counter that reads is much less than writes, i.e, write heavy.<a name="line.60"></a> +<span class="sourceLineNo">061</span> * <p><a name="line.61"></a> +<span class="sourceLineNo">062</span> * We will convert increment to put, and do aggregating when get. And of course the return value of<a name="line.62"></a> +<span class="sourceLineNo">063</span> * increment is useless then.<a name="line.63"></a> +<span class="sourceLineNo">064</span> * <p><a name="line.64"></a> +<span class="sourceLineNo">065</span> * Notice that this is only an example so we do not handle most corner cases, for example, you must<a name="line.65"></a> +<span class="sourceLineNo">066</span> * provide a qualifier when doing a get.<a name="line.66"></a> +<span class="sourceLineNo">067</span> */<a name="line.67"></a> +<span class="sourceLineNo">068</span>public class WriteHeavyIncrementObserver implements RegionCoprocessor, RegionObserver {<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 Optional<RegionObserver> getRegionObserver() {<a name="line.71"></a> +<span class="sourceLineNo">072</span> return Optional.of(this);<a name="line.72"></a> +<span class="sourceLineNo">073</span> }<a name="line.73"></a> +<span class="sourceLineNo">074</span><a name="line.74"></a> +<span class="sourceLineNo">075</span> @Override<a name="line.75"></a> +<span class="sourceLineNo">076</span> public void preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.76"></a> +<span class="sourceLineNo">077</span> ScanOptions options, FlushLifeCycleTracker tracker) throws IOException {<a name="line.77"></a> +<span class="sourceLineNo">078</span> options.readAllVersions();<a name="line.78"></a> +<span class="sourceLineNo">079</span> }<a name="line.79"></a> +<span class="sourceLineNo">080</span><a name="line.80"></a> +<span class="sourceLineNo">081</span> private Cell createCell(byte[] row, byte[] family, byte[] qualifier, long ts, long value) {<a name="line.81"></a> +<span class="sourceLineNo">082</span> return CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(row)<a name="line.82"></a> +<span class="sourceLineNo">083</span> .setType(CellBuilder.DataType.Put).setFamily(family).setQualifier(qualifier)<a name="line.83"></a> +<span class="sourceLineNo">084</span> .setTimestamp(ts).setValue(Bytes.toBytes(value)).build();<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> private InternalScanner wrap(byte[] family, InternalScanner scanner) {<a name="line.87"></a> +<span class="sourceLineNo">088</span> return new InternalScanner() {<a name="line.88"></a> +<span class="sourceLineNo">089</span><a name="line.89"></a> +<span class="sourceLineNo">090</span> private List<Cell> srcResult = new ArrayList<>();<a name="line.90"></a> +<span class="sourceLineNo">091</span><a name="line.91"></a> +<span class="sourceLineNo">092</span> private byte[] row;<a name="line.92"></a> +<span class="sourceLineNo">093</span><a name="line.93"></a> +<span class="sourceLineNo">094</span> private byte[] qualifier;<a name="line.94"></a> +<span class="sourceLineNo">095</span><a name="line.95"></a> +<span class="sourceLineNo">096</span> private long timestamp;<a name="line.96"></a> +<span class="sourceLineNo">097</span><a name="line.97"></a> +<span class="sourceLineNo">098</span> private long sum;<a name="line.98"></a> +<span class="sourceLineNo">099</span><a name="line.99"></a> +<span class="sourceLineNo">100</span> @Override<a name="line.100"></a> +<span class="sourceLineNo">101</span> public boolean next(List<Cell> result, ScannerContext scannerContext) throws IOException {<a name="line.101"></a> +<span class="sourceLineNo">102</span> boolean moreRows = scanner.next(srcResult, scannerContext);<a name="line.102"></a> +<span class="sourceLineNo">103</span> if (srcResult.isEmpty()) {<a name="line.103"></a> +<span class="sourceLineNo">104</span> if (!moreRows && row != null) {<a name="line.104"></a> +<span class="sourceLineNo">105</span> result.add(createCell(row, family, qualifier, timestamp, sum));<a name="line.105"></a> +<span class="sourceLineNo">106</span> }<a name="line.106"></a> +<span class="sourceLineNo">107</span> return moreRows;<a name="line.107"></a> +<span class="sourceLineNo">108</span> }<a name="line.108"></a> +<span class="sourceLineNo">109</span> Cell firstCell = srcResult.get(0);<a name="line.109"></a> +<span class="sourceLineNo">110</span> // Check if there is a row change first. All the cells will come from the same row so just<a name="line.110"></a> +<span class="sourceLineNo">111</span> // check the first one once is enough.<a name="line.111"></a> +<span class="sourceLineNo">112</span> if (row == null) {<a name="line.112"></a> +<span class="sourceLineNo">113</span> row = CellUtil.cloneRow(firstCell);<a name="line.113"></a> +<span class="sourceLineNo">114</span> qualifier = CellUtil.cloneQualifier(firstCell);<a name="line.114"></a> +<span class="sourceLineNo">115</span> } else if (!CellUtil.matchingRows(firstCell, row)) {<a name="line.115"></a> +<span class="sourceLineNo">116</span> result.add(createCell(row, family, qualifier, timestamp, sum));<a name="line.116"></a> +<span class="sourceLineNo">117</span> row = CellUtil.cloneRow(firstCell);<a name="line.117"></a> +<span class="sourceLineNo">118</span> qualifier = CellUtil.cloneQualifier(firstCell);<a name="line.118"></a> +<span class="sourceLineNo">119</span> sum = 0;<a name="line.119"></a> +<span class="sourceLineNo">120</span> }<a name="line.120"></a> +<span class="sourceLineNo">121</span> srcResult.forEach(c -> {<a name="line.121"></a> +<span class="sourceLineNo">122</span> if (CellUtil.matchingQualifier(c, qualifier)) {<a name="line.122"></a> +<span class="sourceLineNo">123</span> sum += Bytes.toLong(c.getValueArray(), c.getValueOffset());<a name="line.123"></a> +<span class="sourceLineNo">124</span> } else {<a name="line.124"></a> +<span class="sourceLineNo">125</span> result.add(createCell(row, family, qualifier, timestamp, sum));<a name="line.125"></a> +<span class="sourceLineNo">126</span> qualifier = CellUtil.cloneQualifier(c);<a name="line.126"></a> +<span class="sourceLineNo">127</span> sum = Bytes.toLong(c.getValueArray(), c.getValueOffset());<a name="line.127"></a> +<span class="sourceLineNo">128</span> }<a name="line.128"></a> +<span class="sourceLineNo">129</span> timestamp = c.getTimestamp();<a name="line.129"></a> +<span class="sourceLineNo">130</span> });<a name="line.130"></a> +<span class="sourceLineNo">131</span> if (!moreRows) {<a name="line.131"></a> +<span class="sourceLineNo">132</span> result.add(createCell(row, family, qualifier, timestamp, sum));<a name="line.132"></a> +<span class="sourceLineNo">133</span> }<a name="line.133"></a> +<span class="sourceLineNo">134</span> srcResult.clear();<a name="line.134"></a> +<span class="sourceLineNo">135</span> return moreRows;<a name="line.135"></a> +<span class="sourceLineNo">136</span> }<a name="line.136"></a> +<span class="sourceLineNo">137</span><a name="line.137"></a> +<span class="sourceLineNo">138</span> @Override<a name="line.138"></a> +<span class="sourceLineNo">139</span> public void close() throws IOException {<a name="line.139"></a> +<span class="sourceLineNo">140</span> scanner.close();<a name="line.140"></a> +<span class="sourceLineNo">141</span> }<a name="line.141"></a> +<span class="sourceLineNo">142</span> };<a name="line.142"></a> +<span class="sourceLineNo">143</span> }<a name="line.143"></a> +<span class="sourceLineNo">144</span><a name="line.144"></a> +<span class="sourceLineNo">145</span> @Override<a name="line.145"></a> +<span class="sourceLineNo">146</span> public InternalScanner preFlush(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.146"></a> +<span class="sourceLineNo">147</span> InternalScanner scanner, FlushLifeCycleTracker tracker) throws IOException {<a name="line.147"></a> +<span class="sourceLineNo">148</span> return wrap(store.getColumnFamilyDescriptor().getName(), scanner);<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> @Override<a name="line.151"></a> +<span class="sourceLineNo">152</span> public void preCompactScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.152"></a> +<span class="sourceLineNo">153</span> ScanType scanType, ScanOptions options, CompactionLifeCycleTracker tracker,<a name="line.153"></a> +<span class="sourceLineNo">154</span> CompactionRequest request) throws IOException {<a name="line.154"></a> +<span class="sourceLineNo">155</span> options.readAllVersions();<a name="line.155"></a> +<span class="sourceLineNo">156</span> }<a name="line.156"></a> +<span class="sourceLineNo">157</span><a name="line.157"></a> +<span class="sourceLineNo">158</span> @Override<a name="line.158"></a> +<span class="sourceLineNo">159</span> public InternalScanner preCompact(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.159"></a> +<span class="sourceLineNo">160</span> InternalScanner scanner, ScanType scanType, CompactionLifeCycleTracker tracker,<a name="line.160"></a> +<span class="sourceLineNo">161</span> CompactionRequest request) throws IOException {<a name="line.161"></a> +<span class="sourceLineNo">162</span> return wrap(store.getColumnFamilyDescriptor().getName(), scanner);<a name="line.162"></a> +<span class="sourceLineNo">163</span> }<a name="line.163"></a> +<span class="sourceLineNo">164</span><a name="line.164"></a> +<span class="sourceLineNo">165</span> @Override<a name="line.165"></a> +<span class="sourceLineNo">166</span> public void preGetOp(ObserverContext<RegionCoprocessorEnvironment> c, Get get, List<Cell> result)<a name="line.166"></a> +<span class="sourceLineNo">167</span> throws IOException {<a name="line.167"></a> +<span class="sourceLineNo">168</span> Scan scan =<a name="line.168"></a> +<span class="sourceLineNo">169</span> new Scan().withStartRow(get.getRow()).withStopRow(get.getRow(), true).readAllVersions();<a name="line.169"></a> +<span class="sourceLineNo">170</span> NavigableMap<byte[], NavigableMap<byte[], MutableLong>> sums =<a name="line.170"></a> +<span class="sourceLineNo">171</span> new TreeMap<>(Bytes.BYTES_COMPARATOR);<a name="line.171"></a> +<span class="sourceLineNo">172</span> get.getFamilyMap().forEach((cf, cqs) -> {<a name="line.172"></a> +<span class="sourceLineNo">173</span> NavigableMap<byte[], MutableLong> ss = new TreeMap<>(Bytes.BYTES_COMPARATOR);<a name="line.173"></a> +<span class="sourceLineNo">174</span> sums.put(cf, ss);<a name="line.174"></a> +<span class="sourceLineNo">175</span> cqs.forEach(cq -> {<a name="line.175"></a> +<span class="sourceLineNo">176</span> ss.put(cq, new MutableLong(0));<a name="line.176"></a> +<span class="sourceLineNo">177</span> scan.addColumn(cf, cq);<a name="line.177"></a> +<span class="sourceLineNo">178</span> });<a name="line.178"></a> +<span class="sourceLineNo">179</span> });<a name="line.179"></a> +<span class="sourceLineNo">180</span> List<Cell> cells = new ArrayList<>();<a name="line.180"></a> +<span class="sourceLineNo">181</span> try (RegionScanner scanner = c.getEnvironment().getRegion().getScanner(scan)) {<a name="line.181"></a> +<span class="sourceLineNo">182</span> boolean moreRows;<a name="line.182"></a> +<span class="sourceLineNo">183</span> do {<a name="line.183"></a> +<span class="sourceLineNo">184</span> moreRows = scanner.next(cells);<a name="line.184"></a> +<span class="sourceLineNo">185</span> for (Cell cell : cells) {<a name="line.185"></a> +<span class="sourceLineNo">186</span> byte[] family = CellUtil.cloneFamily(cell);<a name="line.186"></a> +<span class="sourceLineNo">187</span> byte[] qualifier = CellUtil.cloneQualifier(cell);<a name="line.187"></a> +<span class="sourceLineNo">188</span> long value = Bytes.toLong(cell.getValueArray(), cell.getValueOffset());<a name="line.188"></a> +<span class="sourceLineNo">189</span> sums.get(family).get(qualifier).add(value);<a name="line.189"></a> +<span class="sourceLineNo">190</span> }<a name="line.190"></a> +<span class="sourceLineNo">191</span> cells.clear();<a name="line.191"></a> +<span class="sourceLineNo">192</span> } while (moreRows);<a name="line.192"></a> +<span class="sourceLineNo">193</span> }<a name="line.193"></a> +<span class="sourceLineNo">194</span> sums.forEach((cf, m) -> m.forEach((cq, s) -> result<a name="line.194"></a> +<span class="sourceLineNo">195</span> .add(createCell(get.getRow(), cf, cq, HConstants.LATEST_TIMESTAMP, s.longValue()))));<a name="line.195"></a> +<span class="sourceLineNo">196</span> c.bypass();<a name="line.196"></a> +<span class="sourceLineNo">197</span> }<a name="line.197"></a> +<span class="sourceLineNo">198</span><a name="line.198"></a> +<span class="sourceLineNo">199</span> private final int mask;<a name="line.199"></a> +<span class="sourceLineNo">200</span> private final MutableLong[] lastTimestamps;<a name="line.200"></a> +<span class="sourceLineNo">201</span> {<a name="line.201"></a> +<span class="sourceLineNo">202</span> int stripes =<a name="line.202"></a> +<span class="sourceLineNo">203</span> 1 << IntMath.log2(Runtime.getRuntime().availableProcessors(), RoundingMode.CEILING);<a name="line.203"></a> +<span class="sourceLineNo">204</span> lastTimestamps =<a name="line.204"></a> +<span class="sourceLineNo">205</span> IntStream.range(0, stripes).mapToObj(i -> new MutableLong()).toArray(MutableLong[]::new);<a name="line.205"></a> +<span class="sourceLineNo">206</span> mask = stripes - 1;<a name="line.206"></a> +<span class="sourceLineNo">207</span> }<a name="line.207"></a> +<span class="sourceLineNo">208</span><a name="line.208"></a> +<span class="sourceLineNo">209</span> // We need make sure the different put uses different timestamp otherwise we may lost some<a name="line.209"></a> +<span class="sourceLineNo">210</span> // increments. This is a known issue for HBase.<a name="line.210"></a> +<span class="sourceLineNo">211</span> private long getUniqueTimestamp(byte[] row) {<a name="line.211"></a> +<span class="sourceLineNo">212</span> int slot = Bytes.hashCode(row) & mask;<a name="line.212"></a> +<span class="sourceLineNo">213</span> MutableLong lastTimestamp = lastTimestamps[slot];<a name="line.213"></a> +<span class="sourceLineNo">214</span> long now = System.currentTimeMillis();<a name="line.214"></a> +<span class="sourceLineNo">215</span> synchronized (lastTimestamp) {<a name="line.215"></a> +<span class="sourceLineNo">216</span> long pt = lastTimestamp.longValue() >> 10;<a name="line.216"></a> +<span class="sourceLineNo">217</span> if (now > pt) {<a name="line.217"></a> +<span class="sourceLineNo">218</span> lastTimestamp.setValue(now << 10);<a name="line.218"></a> +<span class="sourceLineNo">219</span> } else {<a name="line.219"></a> +<span class="sourceLineNo">220</span> lastTimestamp.increment();<a name="line.220"></a> +<span class="sourceLineNo">221</span> }<a name="line.221"></a> +<span class="sourceLineNo">222</span> return lastTimestamp.longValue();<a name="line.222"></a> +<span class="sourceLineNo">223</span> }<a name="line.223"></a> +<span class="sourceLineNo">224</span> }<a name="line.224"></a> +<span class="sourceLineNo">225</span><a name="line.225"></a> +<span class="sourceLineNo">226</span> @Override<a name="line.226"></a> +<span class="sourceLineNo">227</span> public Result preIncrement(ObserverContext<RegionCoprocessorEnvironment> c, Increment increment)<a name="line.227"></a> +<span class="sourceLineNo">228</span> throws IOException {<a name="line.228"></a> +<span class="sourceLineNo">229</span> byte[] row = increment.getRow();<a name="line.229"></a> +<span class="sourceLineNo">230</span> Put put = new Put(row);<a name="line.230"></a> +<span class="sourceLineNo">231</span> long ts = getUniqueTimestamp(row);<a name="line.231"></a> +<span class="sourceLineNo">232</span> for (Map.Entry<byte[], List<Cell>> entry : increment.getFamilyCellMap().entrySet()) {<a name="line.232"></a> +<span class="sourceLineNo">233</span> for (Cell cell : entry.getValue()) {<a name="line.233"></a> +<span class="sourceLineNo">234</span> put.add(CellBuilderFactory.create(CellBuilderType.SHALLOW_COPY).setRow(row)<a name="line.234"></a> +<span class="sourceLineNo">235</span> .setFamily(cell.getFamilyArray(), cell.getFamilyOffset(), cell.getFamilyLength())<a name="line.235"></a> +<span class="sourceLineNo">236</span> .setQualifier(cell.getQualifierArray(), cell.getQualifierOffset(),<a name="line.236"></a> +<span class="sourceLineNo">237</span> cell.getQualifierLength())<a name="line.237"></a> +<span class="sourceLineNo">238</span> .setValue(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength())<a name="line.238"></a> +<span class="sourceLineNo">239</span> .setType(CellBuilder.DataType.Put).setTimestamp(ts).build());<a name="line.239"></a> +<span class="sourceLineNo">240</span> }<a name="line.240"></a> +<span class="sourceLineNo">241</span> }<a name="line.241"></a> +<span class="sourceLineNo">242</span> c.getEnvironment().getRegion().put(put);<a name="line.242"></a> +<span class="sourceLineNo">243</span> c.bypass();<a name="line.243"></a> +<span class="sourceLineNo">244</span> return Result.EMPTY_RESULT;<a name="line.244"></a> +<span class="sourceLineNo">245</span> }<a name="line.245"></a> +<span class="sourceLineNo">246</span><a name="line.246"></a> +<span class="sourceLineNo">247</span> @Override<a name="line.247"></a> +<span class="sourceLineNo">248</span> public void preStoreScannerOpen(ObserverContext<RegionCoprocessorEnvironment> ctx, Store store,<a name="line.248"></a> +<span class="sourceLineNo">249</span> ScanOptions options) throws IOException {<a name="line.249"></a> +<span class="sourceLineNo">250</span> options.readAllVersions();<a name="line.250"></a> +<span class="sourceLineNo">251</span> }<a name="line.251"></a> +<span class="sourceLineNo">252</span>}<a name="line.252"></a> + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +</pre> +</div> +</body> +</html>
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/1d9053bc/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/ZooKeeperScanPolicyObserver.ZKDataHolder.html ---------------------------------------------------------------------- diff --git a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/ZooKeeperScanPolicyObserver.ZKDataHolder.html b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/ZooKeeperScanPolicyObserver.ZKDataHolder.html index 2915238..5095472 100644 --- a/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/ZooKeeperScanPolicyObserver.ZKDataHolder.html +++ b/devapidocs/src-html/org/apache/hadoop/hbase/coprocessor/example/ZooKeeperScanPolicyObserver.ZKDataHolder.html @@ -27,187 +27,176 @@ <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.coprocessor.example;<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.util.List;<a name="line.22"></a> -<span class="sourceLineNo">023</span>import java.util.Optional;<a name="line.23"></a> -<span class="sourceLineNo">024</span>import java.util.OptionalLong;<a name="line.24"></a> -<span class="sourceLineNo">025</span><a name="line.25"></a> -<span class="sourceLineNo">026</span>import org.apache.curator.framework.CuratorFramework;<a name="line.26"></a> -<span class="sourceLineNo">027</span>import org.apache.curator.framework.CuratorFrameworkFactory;<a name="line.27"></a> -<span class="sourceLineNo">028</span>import org.apache.curator.framework.recipes.cache.ChildData;<a name="line.28"></a> -<span class="sourceLineNo">029</span>import org.apache.curator.framework.recipes.cache.NodeCache;<a name="line.29"></a> -<span class="sourceLineNo">030</span>import org.apache.curator.retry.RetryForever;<a name="line.30"></a> -<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.Cell;<a name="line.31"></a> -<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.CoprocessorEnvironment;<a name="line.32"></a> -<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.coprocessor.ObserverContext;<a name="line.33"></a> -<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;<a name="line.34"></a> -<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;<a name="line.35"></a> -<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.coprocessor.RegionObserver;<a name="line.36"></a> -<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker;<a name="line.37"></a> -<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.regionserver.InternalScanner;<a name="line.38"></a> -<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.regionserver.ScanType;<a name="line.39"></a> -<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.regionserver.ScannerContext;<a name="line.40"></a> -<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.regionserver.Store;<a name="line.41"></a> -<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;<a name="line.42"></a> -<span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;<a name="line.43"></a> -<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.44"></a> -<span class="sourceLineNo">045</span><a name="line.45"></a> -<span class="sourceLineNo">046</span>/**<a name="line.46"></a> -<span class="sourceLineNo">047</span> * This is an example showing how a RegionObserver could configured via ZooKeeper in order to<a name="line.47"></a> -<span class="sourceLineNo">048</span> * control a Region compaction, flush, and scan policy. This also demonstrated the use of shared<a name="line.48"></a> -<span class="sourceLineNo">049</span> * {@link org.apache.hadoop.hbase.coprocessor.RegionObserver} state. See<a name="line.49"></a> -<span class="sourceLineNo">050</span> * {@link RegionCoprocessorEnvironment#getSharedData()}.<a name="line.50"></a> -<span class="sourceLineNo">051</span> * <p><a name="line.51"></a> -<span class="sourceLineNo">052</span> * This would be useful for an incremental backup tool, which would indicate the last time of a<a name="line.52"></a> -<span class="sourceLineNo">053</span> * successful backup via ZK and instruct HBase that to safely delete the data which has already been<a name="line.53"></a> -<span class="sourceLineNo">054</span> * backup.<a name="line.54"></a> -<span class="sourceLineNo">055</span> */<a name="line.55"></a> -<span class="sourceLineNo">056</span>public class ZooKeeperScanPolicyObserver implements RegionCoprocessor, RegionObserver {<a name="line.56"></a> -<span class="sourceLineNo">057</span><a name="line.57"></a> -<span class="sourceLineNo">058</span> @Override<a name="line.58"></a> -<span class="sourceLineNo">059</span> public Optional<RegionObserver> getRegionObserver() {<a name="line.59"></a> -<span class="sourceLineNo">060</span> return Optional.of(this);<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> // The zk ensemble info is put in hbase config xml with given custom key.<a name="line.63"></a> -<span class="sourceLineNo">064</span> public static final String ZK_ENSEMBLE_KEY = "ZooKeeperScanPolicyObserver.zookeeper.ensemble";<a name="line.64"></a> -<span class="sourceLineNo">065</span> public static final String ZK_SESSION_TIMEOUT_KEY =<a name="line.65"></a> -<span class="sourceLineNo">066</span> "ZooKeeperScanPolicyObserver.zookeeper.session.timeout";<a name="line.66"></a> -<span class="sourceLineNo">067</span> public static final int ZK_SESSION_TIMEOUT_DEFAULT = 30 * 1000; // 30 secs<a name="line.67"></a> -<span class="sourceLineNo">068</span> public static final String NODE = "/backup/example/lastbackup";<a name="line.68"></a> -<span class="sourceLineNo">069</span> private static final String ZKKEY = "ZK";<a name="line.69"></a> +<span class="sourceLineNo">022</span>import java.util.Optional;<a name="line.22"></a> +<span class="sourceLineNo">023</span>import java.util.OptionalLong;<a name="line.23"></a> +<span class="sourceLineNo">024</span><a name="line.24"></a> +<span class="sourceLineNo">025</span>import org.apache.curator.framework.CuratorFramework;<a name="line.25"></a> +<span class="sourceLineNo">026</span>import org.apache.curator.framework.CuratorFrameworkFactory;<a name="line.26"></a> +<span class="sourceLineNo">027</span>import org.apache.curator.framework.recipes.cache.ChildData;<a name="line.27"></a> +<span class="sourceLineNo">028</span>import org.apache.curator.framework.recipes.cache.NodeCache;<a name="line.28"></a> +<span class="sourceLineNo">029</span>import org.apache.curator.retry.RetryForever;<a name="line.29"></a> +<span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.CoprocessorEnvironment;<a name="line.30"></a> +<span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.coprocessor.ObserverContext;<a name="line.31"></a> +<span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessor;<a name="line.32"></a> +<span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;<a name="line.33"></a> +<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.coprocessor.RegionObserver;<a name="line.34"></a> +<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.regionserver.FlushLifeCycleTracker;<a name="line.35"></a> +<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.regionserver.ScanOptions;<a name="line.36"></a> +<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.regionserver.ScanType;<a name="line.37"></a> +<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.regionserver.Store;<a name="line.38"></a> +<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionLifeCycleTracker;<a name="line.39"></a> +<span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest;<a name="line.40"></a> +<span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.41"></a> +<span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;<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> * This is an example showing how a RegionObserver could configured via ZooKeeper in order to<a name="line.45"></a> +<span class="sourceLineNo">046</span> * control a Region compaction, flush, and scan policy. This also demonstrated the use of shared<a name="line.46"></a> +<span class="sourceLineNo">047</span> * {@link org.apache.hadoop.hbase.coprocessor.RegionObserver} state. See<a name="line.47"></a> +<span class="sourceLineNo">048</span> * {@link RegionCoprocessorEnvironment#getSharedData()}.<a name="line.48"></a> +<span class="sourceLineNo">049</span> * <p><a name="line.49"></a> +<span class="sourceLineNo">050</span> * This would be useful for an incremental backup tool, which would indicate the last time of a<a name="line.50"></a> +<span class="sourceLineNo">051</span> * successful backup via ZK and instruct HBase that to safely delete the data which has already been<a name="line.51"></a> +<span class="sourceLineNo">052</span> * backup.<a name="line.52"></a> +<span class="sourceLineNo">053</span> */<a name="line.53"></a> +<span class="sourceLineNo">054</span>public class ZooKeeperScanPolicyObserver implements RegionCoprocessor, RegionObserver {<a name="line.54"></a> +<span class="sourceLineNo">055</span><a name="line.55"></a> +<span class="sourceLineNo">056</span> @Override<a name="line.56"></a> +<span class="sourceLineNo">057</span> public Optional<RegionObserver> getRegionObserver() {<a name="line.57"></a> +<span class="sourceLineNo">058</span> return Optional.of(this);<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> // The zk ensemble info is put in hbase config xml with given custom key.<a name="line.61"></a> +<span class="sourceLineNo">062</span> public static final String ZK_ENSEMBLE_KEY = "ZooKeeperScanPolicyObserver.zookeeper.ensemble";<a name="line.62"></a> +<span class="sourceLineNo">063</span> public static final String ZK_SESSION_TIMEOUT_KEY =<a name="line.63"></a> +<span class="sourceLineNo">064</span> "ZooKeeperScanPolicyObserver.zookeeper.session.timeout";<a name="line.64"></a> +<span class="sourceLineNo">065</span> public static final int ZK_SESSION_TIMEOUT_DEFAULT = 30 * 1000; // 30 secs<a name="line.65"></a> +<span class="sourceLineNo">066</span> public static final String NODE = "/backup/example/lastbackup";<a name="line.66"></a> +<span class="sourceLineNo">067</span> private static final String ZKKEY = "ZK";<a name="line.67"></a> +<span class="sourceLineNo">068</span><a name="line.68"></a> +<span class="sourceLineNo">069</span> private NodeCache cache;<a name="line.69"></a> <span class="sourceLineNo">070</span><a name="line.70"></a> -<span class="sourceLineNo">071</span> private NodeCache cache;<a name="line.71"></a> -<span class="sourceLineNo">072</span><a name="line.72"></a> -<span class="sourceLineNo">073</span> /**<a name="line.73"></a> -<span class="sourceLineNo">074</span> * Internal watcher that keep "data" up to date asynchronously.<a name="line.74"></a> -<span class="sourceLineNo">075</span> */<a name="line.75"></a> -<span class="sourceLineNo">076</span> private static final class ZKDataHolder {<a name="line.76"></a> +<span class="sourceLineNo">071</span> /**<a name="line.71"></a> +<span class="sourceLineNo">072</span> * Internal watcher that keep "data" up to date asynchronously.<a name="line.72"></a> +<span class="sourceLineNo">073</span> */<a name="line.73"></a> +<span class="sourceLineNo">074</span> private static final class ZKDataHolder {<a name="line.74"></a> +<span class="sourceLineNo">075</span><a name="line.75"></a> +<span class="sourceLineNo">076</span> private final String ensemble;<a name="line.76"></a> <span class="sourceLineNo">077</span><a name="line.77"></a> -<span class="sourceLineNo">078</span> private final String ensemble;<a name="line.78"></a> +<span class="sourceLineNo">078</span> private final int sessionTimeout;<a name="line.78"></a> <span class="sourceLineNo">079</span><a name="line.79"></a> -<span class="sourceLineNo">080</span> private final int sessionTimeout;<a name="line.80"></a> +<span class="sourceLineNo">080</span> private CuratorFramework client;<a name="line.80"></a> <span class="sourceLineNo">081</span><a name="line.81"></a> -<span class="sourceLineNo">082</span> private CuratorFramework client;<a name="line.82"></a> +<span class="sourceLineNo">082</span> private NodeCache cache;<a name="line.82"></a> <span class="sourceLineNo">083</span><a name="line.83"></a> -<span class="sourceLineNo">084</span> private NodeCache cache;<a name="line.84"></a> +<span class="sourceLineNo">084</span> private int ref;<a name="line.84"></a> <span class="sourceLineNo">085</span><a name="line.85"></a> -<span class="sourceLineNo">086</span> private int ref;<a name="line.86"></a> -<span class="sourceLineNo">087</span><a name="line.87"></a> -<span class="sourceLineNo">088</span> public ZKDataHolder(String ensemble, int sessionTimeout) {<a name="line.88"></a> -<span class="sourceLineNo">089</span> this.ensemble = ensemble;<a name="line.89"></a> -<span class="sourceLineNo">090</span> this.sessionTimeout = sessionTimeout;<a name="line.90"></a> -<span class="sourceLineNo">091</span> }<a name="line.91"></a> -<span class="sourceLineNo">092</span><a name="line.92"></a> -<span 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class="sourceLineNo">104</span> try {<a name="line.104"></a> -<span class="sourceLineNo">105</span> cache.close();<a name="line.105"></a> -<span class="sourceLineNo">106</span> } catch (IOException e) {<a name="line.106"></a> -<span class="sourceLineNo">107</span> // should not happen<a name="line.107"></a> -<span class="sourceLineNo">108</span> throw new AssertionError(e);<a name="line.108"></a> -<span class="sourceLineNo">109</span> }<a name="line.109"></a> -<span class="sourceLineNo">110</span> cache = null;<a name="line.110"></a> -<span class="sourceLineNo">111</span> }<a name="line.111"></a> -<span class="sourceLineNo">112</span> if (client != null) {<a name="line.112"></a> -<span class="sourceLineNo">113</span> client.close();<a name="line.113"></a> -<span class="sourceLineNo">114</span> client = null;<a name="line.114"></a> -<span class="sourceLineNo">115</span> }<a name="line.115"></a> -<span class="sourceLineNo">116</span> }<a name="line.116"></a> -<span 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class="sourceLineNo">114</span> }<a name="line.114"></a> +<span class="sourceLineNo">115</span><a name="line.115"></a> +<span class="sourceLineNo">116</span> public synchronized NodeCache acquire() throws Exception {<a name="line.116"></a> +<span class="sourceLineNo">117</span> if (ref == 0) {<a name="line.117"></a> +<span class="sourceLineNo">118</span> try {<a name="line.118"></a> +<span class="sourceLineNo">119</span> create();<a name="line.119"></a> +<span class="sourceLineNo">120</span> } catch (Exception e) {<a name="line.120"></a> +<span class="sourceLineNo">121</span> close();<a name="line.121"></a> +<span class="sourceLineNo">122</span> throw e;<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> ref++;<a name="line.125"></a> +<span class="sourceLineNo">126</span> return cache;<a name="line.126"></a> +<span class="sourceLineNo">127</span> }<a name="line.127"></a> +<span class="sourceLineNo">128</span><a name="line.128"></a> +<span class="sourceLineNo">129</span> public synchronized void release() {<a name="line.129"></a> +<span class="sourceLineNo">130</span> ref--;<a name="line.130"></a> +<span class="sourceLineNo">131</span> if (ref == 0) {<a name="line.131"></a> +<span class="sourceLineNo">132</span> close();<a name="line.132"></a> +<span class="sourceLineNo">133</span> }<a name="line.133"></a> +<span class="sourceLineNo">134</span> }<a name="line.134"></a> +<span class="sourceLineNo">135</span> }<a name="line.135"></a> +<span class="sourceLineNo">136</span><a name="line.136"></a> +<span class="sourceLineNo">137</span> @Override<a name="line.137"></a> +<span class="sourceLineNo">138</span> public void start(CoprocessorEnvironment env) throws IOException {<a name="line.138"></a> +<span class="sourceLineNo">139</span> RegionCoprocessorEnvironment renv = (RegionCoprocessorEnvironment) env;<a name="line.139"></a> +<span class="sourceLineNo">140</span> try {<a name="line.140"></a> +<span class="sourceLineNo">141</span> this.cache = ((ZKDataHolder) renv.getSharedData().computeIfAbsent(ZKKEY, k -> {<a name="line.141"></a> +<span class="sourceLineNo">142</span> String ensemble = renv.getConfiguration().get(ZK_ENSEMBLE_KEY);<a name="line.142"></a> +<span class="sourceLineNo">143</span> int sessionTimeout =<a name="line.143"></a> +<span class="sourceLineNo">144</span> renv.getConfiguration().getInt(ZK_SESSION_TIMEOUT_KEY, ZK_SESSION_TIMEOUT_DEFAULT);<a name="line.144"></a> +<span class="sourceLineNo">145</span> return new ZKDataHolder(ensemble, sessionTimeout);<a name="line.145"></a> +<span class="sourceLineNo">146</span> })).acquire();<a name="line.146"></a> +<span class="sourceLineNo">147</span> } catch (Exception e) {<a name="line.147"></a> +<span class="sourceLineNo">148</span> throw new IOException(e);<a name="line.148"></a> +<span class="sourceLineNo">149</span> }<a name="line.149"></a> +<span 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getExpireBefore();<a name="line.172"></a> +<span class="sourceLineNo">173</span> if (!expireBefore.isPresent()) {<a name="line.173"></a> +<span class="sourceLineNo">174</span> return;<a name="line.174"></a> +<span class="sourceLineNo">175</span> }<a name="line.175"></a> +<span class="sourceLineNo">176</span> options.setTTL(EnvironmentEdgeManager.currentTime() - expireBefore.getAsLong());<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> @Override<a name="line.179"></a> +<span class="sourceLineNo">180</span> public void preFlushScannerOpen(ObserverContext<RegionCoprocessorEnvironment> c, Store store,<a name="line.180"></a> +<span class="sourceLineNo">181</span> ScanOptions options, FlushLifeCycleTracker tracker) throws IOException {<a name="line.181"></a> +<span class="sourceLineNo">182</span> resetTTL(options);<a name="line.182"></a> +<span 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