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Posted to commits@hbase.apache.org by gi...@apache.org on 2017/06/28 15:01:21 UTC
[17/38] hbase-site git commit: Published site at
82d554e3783372cc6b05489452c815b57c06f6cd.
http://git-wip-us.apache.org/repos/asf/hbase-site/blob/2848f431/devapidocs/src-html/org/apache/hadoop/hbase/mapreduce/MultiTableHFileOutputFormat.MultiHFilePartitioner.TableSplitKeyPair.html
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-<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.mapreduce;<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.io.UnsupportedEncodingException;<a name="line.21"></a>
-<span class="sourceLineNo">022</span>import java.util.HashMap;<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.UUID;<a name="line.25"></a>
-<span class="sourceLineNo">026</span>import java.util.TreeMap;<a name="line.26"></a>
-<span class="sourceLineNo">027</span>import java.util.ArrayList;<a name="line.27"></a>
-<span class="sourceLineNo">028</span>import java.util.TreeSet;<a name="line.28"></a>
-<span class="sourceLineNo">029</span>import java.util.Collections;<a name="line.29"></a>
-<span class="sourceLineNo">030</span><a name="line.30"></a>
-<span class="sourceLineNo">031</span>import org.apache.commons.logging.Log;<a name="line.31"></a>
-<span class="sourceLineNo">032</span>import org.apache.commons.logging.LogFactory;<a name="line.32"></a>
-<span class="sourceLineNo">033</span><a name="line.33"></a>
-<span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.classification.InterfaceAudience;<a name="line.34"></a>
-<span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.client.Admin;<a name="line.35"></a>
-<span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.client.Connection;<a name="line.36"></a>
-<span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.client.ConnectionFactory;<a name="line.37"></a>
-<span class="sourceLineNo">038</span>import org.apache.hadoop.hbase.client.RegionLocator;<a name="line.38"></a>
-<span class="sourceLineNo">039</span>import org.apache.hadoop.hbase.client.Table;<a name="line.39"></a>
-<span class="sourceLineNo">040</span>import org.apache.hadoop.conf.Configurable;<a name="line.40"></a>
-<span class="sourceLineNo">041</span>import org.apache.hadoop.conf.Configuration;<a name="line.41"></a>
-<span class="sourceLineNo">042</span>import org.apache.hadoop.fs.FileSystem;<a name="line.42"></a>
-<span class="sourceLineNo">043</span>import org.apache.hadoop.fs.Path;<a name="line.43"></a>
-<span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.Cell;<a name="line.44"></a>
-<span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.45"></a>
-<span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.HConstants;<a name="line.46"></a>
-<span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.HTableDescriptor;<a name="line.47"></a>
-<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.KeyValue;<a name="line.48"></a>
-<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.TableName;<a name="line.49"></a>
-<span class="sourceLineNo">050</span>import org.apache.hadoop.hbase.io.ImmutableBytesWritable;<a name="line.50"></a>
-<span class="sourceLineNo">051</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.51"></a>
-<span class="sourceLineNo">052</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.52"></a>
-<span class="sourceLineNo">053</span>import org.apache.hadoop.io.IOUtils;<a name="line.53"></a>
-<span class="sourceLineNo">054</span>import org.apache.hadoop.io.SequenceFile;<a name="line.54"></a>
-<span class="sourceLineNo">055</span>import org.apache.hadoop.io.SequenceFile.Reader;<a name="line.55"></a>
-<span class="sourceLineNo">056</span>import org.apache.hadoop.io.SequenceFile.Writer;<a name="line.56"></a>
-<span class="sourceLineNo">057</span>import org.apache.hadoop.mapreduce.Job;<a name="line.57"></a>
-<span class="sourceLineNo">058</span>import org.apache.hadoop.mapreduce.OutputFormat;<a name="line.58"></a>
-<span class="sourceLineNo">059</span>import org.apache.hadoop.mapreduce.Partitioner;<a name="line.59"></a>
-<span class="sourceLineNo">060</span>import org.apache.hadoop.mapreduce.RecordWriter;<a name="line.60"></a>
-<span class="sourceLineNo">061</span>import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.61"></a>
-<span class="sourceLineNo">062</span>import org.apache.hadoop.mapreduce.lib.output.FileOutputCommitter;<a name="line.62"></a>
-<span class="sourceLineNo">063</span>import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;<a name="line.63"></a>
-<span class="sourceLineNo">064</span>import org.apache.hadoop.util.ReflectionUtils;<a name="line.64"></a>
-<span class="sourceLineNo">065</span><a name="line.65"></a>
-<span class="sourceLineNo">066</span>import com.google.common.annotations.VisibleForTesting;<a name="line.66"></a>
-<span class="sourceLineNo">067</span><a name="line.67"></a>
-<span class="sourceLineNo">068</span>/**<a name="line.68"></a>
-<span class="sourceLineNo">069</span> * Create 3 level tree directory, first level is using table name as parent directory and then use<a name="line.69"></a>
-<span class="sourceLineNo">070</span> * family name as child directory, and all related HFiles for one family are under child directory<a name="line.70"></a>
-<span class="sourceLineNo">071</span> * -tableName1<a name="line.71"></a>
-<span class="sourceLineNo">072</span> * -columnFamilyName1<a name="line.72"></a>
-<span class="sourceLineNo">073</span> * -HFile (region1)<a name="line.73"></a>
-<span class="sourceLineNo">074</span> * -columnFamilyName2<a name="line.74"></a>
-<span class="sourceLineNo">075</span> * -HFile1 (region1)<a name="line.75"></a>
-<span class="sourceLineNo">076</span> * -HFile2 (region2)<a name="line.76"></a>
-<span class="sourceLineNo">077</span> * -HFile3 (region3)<a name="line.77"></a>
-<span class="sourceLineNo">078</span> * -tableName2<a name="line.78"></a>
-<span class="sourceLineNo">079</span> * -columnFamilyName1<a name="line.79"></a>
-<span class="sourceLineNo">080</span> * -HFile (region1)<a name="line.80"></a>
-<span class="sourceLineNo">081</span> * family directory and its hfiles match the output of HFileOutputFormat2<a name="line.81"></a>
-<span class="sourceLineNo">082</span> * @see org.apache.hadoop.hbase.mapreduce.HFileOutputFormat2<a name="line.82"></a>
-<span class="sourceLineNo">083</span> */<a name="line.83"></a>
-<span class="sourceLineNo">084</span><a name="line.84"></a>
-<span class="sourceLineNo">085</span>@InterfaceAudience.Public<a name="line.85"></a>
-<span class="sourceLineNo">086</span>@VisibleForTesting<a name="line.86"></a>
-<span class="sourceLineNo">087</span>public class MultiTableHFileOutputFormat extends FileOutputFormat<ImmutableBytesWritable, Cell> {<a name="line.87"></a>
-<span class="sourceLineNo">088</span> private static final Log LOG = LogFactory.getLog(MultiTableHFileOutputFormat.class);<a name="line.88"></a>
-<span class="sourceLineNo">089</span><a name="line.89"></a>
-<span class="sourceLineNo">090</span> @Override<a name="line.90"></a>
-<span class="sourceLineNo">091</span> public RecordWriter<ImmutableBytesWritable, Cell><a name="line.91"></a>
-<span class="sourceLineNo">092</span> getRecordWriter(final TaskAttemptContext context) throws IOException, InterruptedException {<a name="line.92"></a>
-<span class="sourceLineNo">093</span> return createMultiHFileRecordWriter(context);<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> static <V extends Cell> RecordWriter<ImmutableBytesWritable, V><a name="line.96"></a>
-<span class="sourceLineNo">097</span> createMultiHFileRecordWriter(final TaskAttemptContext context) throws IOException {<a name="line.97"></a>
-<span class="sourceLineNo">098</span><a name="line.98"></a>
-<span class="sourceLineNo">099</span> // Get the path of the output directory<a name="line.99"></a>
-<span class="sourceLineNo">100</span> final Path outputPath = FileOutputFormat.getOutputPath(context);<a name="line.100"></a>
-<span class="sourceLineNo">101</span> final Path outputDir = new FileOutputCommitter(outputPath, context).getWorkPath();<a name="line.101"></a>
-<span class="sourceLineNo">102</span> final Configuration conf = context.getConfiguration();<a name="line.102"></a>
-<span class="sourceLineNo">103</span> final FileSystem fs = outputDir.getFileSystem(conf);<a name="line.103"></a>
-<span class="sourceLineNo">104</span><a name="line.104"></a>
-<span class="sourceLineNo">105</span> Connection conn = ConnectionFactory.createConnection(conf);<a name="line.105"></a>
-<span class="sourceLineNo">106</span> Admin admin = conn.getAdmin();<a name="line.106"></a>
-<span class="sourceLineNo">107</span><a name="line.107"></a>
-<span class="sourceLineNo">108</span> // Map of existing tables, avoid calling getTable() everytime<a name="line.108"></a>
-<span class="sourceLineNo">109</span> final Map<ImmutableBytesWritable, Table> tables = new HashMap<>();<a name="line.109"></a>
-<span class="sourceLineNo">110</span><a name="line.110"></a>
-<span class="sourceLineNo">111</span> // Map of tables to writers<a name="line.111"></a>
-<span class="sourceLineNo">112</span> final Map<ImmutableBytesWritable, RecordWriter<ImmutableBytesWritable, V>> tableWriters = new HashMap<>();<a name="line.112"></a>
-<span class="sourceLineNo">113</span><a name="line.113"></a>
-<span class="sourceLineNo">114</span> return new RecordWriter<ImmutableBytesWritable, V>() {<a name="line.114"></a>
-<span class="sourceLineNo">115</span> @Override<a name="line.115"></a>
-<span class="sourceLineNo">116</span> public void write(ImmutableBytesWritable tableName, V cell)<a name="line.116"></a>
-<span class="sourceLineNo">117</span> throws IOException, InterruptedException {<a name="line.117"></a>
-<span class="sourceLineNo">118</span> RecordWriter<ImmutableBytesWritable, V> tableWriter = tableWriters.get(tableName);<a name="line.118"></a>
-<span class="sourceLineNo">119</span> // if there is new table, verify that table directory exists<a name="line.119"></a>
-<span class="sourceLineNo">120</span> if (tableWriter == null) {<a name="line.120"></a>
-<span class="sourceLineNo">121</span> // using table name as directory name<a name="line.121"></a>
-<span class="sourceLineNo">122</span> final Path tableOutputDir = new Path(outputDir, Bytes.toString(tableName.copyBytes()));<a name="line.122"></a>
-<span class="sourceLineNo">123</span> fs.mkdirs(tableOutputDir);<a name="line.123"></a>
-<span class="sourceLineNo">124</span> LOG.info("Writing Table '" + tableName.toString() + "' data into following directory"<a name="line.124"></a>
-<span class="sourceLineNo">125</span> + tableOutputDir.toString());<a name="line.125"></a>
-<span class="sourceLineNo">126</span> // Configure for tableWriter, if table exist, write configuration of table into conf<a name="line.126"></a>
-<span class="sourceLineNo">127</span> Table table = null;<a name="line.127"></a>
-<span class="sourceLineNo">128</span> if (tables.containsKey(tableName)) {<a name="line.128"></a>
-<span class="sourceLineNo">129</span> table = tables.get(tableName);<a name="line.129"></a>
-<span class="sourceLineNo">130</span> } else {<a name="line.130"></a>
-<span class="sourceLineNo">131</span> table = getTable(tableName.copyBytes(), conn, admin);<a name="line.131"></a>
-<span class="sourceLineNo">132</span> tables.put(tableName, table);<a name="line.132"></a>
-<span class="sourceLineNo">133</span> }<a name="line.133"></a>
-<span class="sourceLineNo">134</span> if (table != null) {<a name="line.134"></a>
-<span class="sourceLineNo">135</span> configureForOneTable(conf, table.getTableDescriptor());<a name="line.135"></a>
-<span class="sourceLineNo">136</span> }<a name="line.136"></a>
-<span class="sourceLineNo">137</span> // Create writer for one specific table<a name="line.137"></a>
-<span class="sourceLineNo">138</span> tableWriter = new HFileOutputFormat2.HFileRecordWriter<>(context, tableOutputDir);<a name="line.138"></a>
-<span class="sourceLineNo">139</span> // Put table into map<a name="line.139"></a>
-<span class="sourceLineNo">140</span> tableWriters.put(tableName, tableWriter);<a name="line.140"></a>
-<span class="sourceLineNo">141</span> }<a name="line.141"></a>
-<span class="sourceLineNo">142</span> // Write <Row, Cell> into tableWriter<a name="line.142"></a>
-<span class="sourceLineNo">143</span> // in the original code, it does not use Row<a name="line.143"></a>
-<span class="sourceLineNo">144</span> tableWriter.write(null, cell);<a name="line.144"></a>
-<span class="sourceLineNo">145</span> }<a name="line.145"></a>
-<span class="sourceLineNo">146</span><a name="line.146"></a>
-<span class="sourceLineNo">147</span> @Override<a name="line.147"></a>
-<span class="sourceLineNo">148</span> public void close(TaskAttemptContext c) throws IOException, InterruptedException {<a name="line.148"></a>
-<span class="sourceLineNo">149</span> for (RecordWriter<ImmutableBytesWritable, V> writer : tableWriters.values()) {<a name="line.149"></a>
-<span class="sourceLineNo">150</span> writer.close(c);<a name="line.150"></a>
-<span class="sourceLineNo">151</span> }<a name="line.151"></a>
-<span class="sourceLineNo">152</span> if (conn != null) {<a name="line.152"></a>
-<span class="sourceLineNo">153</span> conn.close();<a name="line.153"></a>
-<span class="sourceLineNo">154</span> }<a name="line.154"></a>
-<span class="sourceLineNo">155</span> if (admin != null) {<a name="line.155"></a>
-<span class="sourceLineNo">156</span> admin.close();<a name="line.156"></a>
-<span class="sourceLineNo">157</span> }<a name="line.157"></a>
-<span class="sourceLineNo">158</span> }<a name="line.158"></a>
-<span class="sourceLineNo">159</span> };<a name="line.159"></a>
-<span class="sourceLineNo">160</span> }<a name="line.160"></a>
-<span class="sourceLineNo">161</span><a name="line.161"></a>
-<span class="sourceLineNo">162</span> /**<a name="line.162"></a>
-<span class="sourceLineNo">163</span> * Configure for one table, should be used before creating a new HFileRecordWriter,<a name="line.163"></a>
-<span class="sourceLineNo">164</span> * Set compression algorithms and related configuration based on column families<a name="line.164"></a>
-<span class="sourceLineNo">165</span> */<a name="line.165"></a>
-<span class="sourceLineNo">166</span> private static void configureForOneTable(Configuration conf, final HTableDescriptor tableDescriptor)<a name="line.166"></a>
-<span class="sourceLineNo">167</span> throws UnsupportedEncodingException {<a name="line.167"></a>
-<span class="sourceLineNo">168</span> HFileOutputFormat2.configureCompression(conf, tableDescriptor);<a name="line.168"></a>
-<span class="sourceLineNo">169</span> HFileOutputFormat2.configureBlockSize(tableDescriptor, conf);<a name="line.169"></a>
-<span class="sourceLineNo">170</span> HFileOutputFormat2.configureBloomType(tableDescriptor, conf);<a name="line.170"></a>
-<span class="sourceLineNo">171</span> HFileOutputFormat2.configureDataBlockEncoding(tableDescriptor, conf);<a name="line.171"></a>
-<span class="sourceLineNo">172</span> }<a name="line.172"></a>
-<span class="sourceLineNo">173</span><a name="line.173"></a>
-<span class="sourceLineNo">174</span> /**<a name="line.174"></a>
-<span class="sourceLineNo">175</span> * Configure a MapReduce Job to output HFiles for performing an incremental load into<a name="line.175"></a>
-<span class="sourceLineNo">176</span> * the multiple tables.<a name="line.176"></a>
-<span class="sourceLineNo">177</span> * <ul><a name="line.177"></a>
-<span class="sourceLineNo">178</span> * <li>Inspects the tables to configure a partitioner based on their region boundaries</li><a name="line.178"></a>
-<span class="sourceLineNo">179</span> * <li>Writes the partitions file and configures the partitioner</li><a name="line.179"></a>
-<span class="sourceLineNo">180</span> * <li>Sets the number of reduce tasks to match the total number of all tables' regions</li><a name="line.180"></a>
-<span class="sourceLineNo">181</span> * <li>Sets the reducer up to perform the appropriate sorting (KeyValueSortReducer)</li><a name="line.181"></a>
-<span class="sourceLineNo">182</span> * </ul><a name="line.182"></a>
-<span class="sourceLineNo">183</span> *<a name="line.183"></a>
-<span class="sourceLineNo">184</span> * ConfigureIncrementalLoad has set up partitioner and reducer for mapreduce job.<a name="line.184"></a>
-<span class="sourceLineNo">185</span> * Caller needs to setup input path, output path and mapper<a name="line.185"></a>
-<span class="sourceLineNo">186</span> *<a name="line.186"></a>
-<span class="sourceLineNo">187</span> * @param job<a name="line.187"></a>
-<span class="sourceLineNo">188</span> * @param tables A list of tables to inspects<a name="line.188"></a>
-<span class="sourceLineNo">189</span> * @throws IOException<a name="line.189"></a>
-<span class="sourceLineNo">190</span> */<a name="line.190"></a>
-<span class="sourceLineNo">191</span> public static void configureIncrementalLoad(Job job, List<TableName> tables) throws IOException {<a name="line.191"></a>
-<span class="sourceLineNo">192</span> configureIncrementalLoad(job, tables, MultiTableHFileOutputFormat.class);<a name="line.192"></a>
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-<span class="sourceLineNo">194</span><a name="line.194"></a>
-<span class="sourceLineNo">195</span> public static void configureIncrementalLoad(Job job, List<TableName> tables,<a name="line.195"></a>
-<span class="sourceLineNo">196</span> Class<? extends OutputFormat<?, ?>> cls) throws IOException {<a name="line.196"></a>
-<span class="sourceLineNo">197</span><a name="line.197"></a>
-<span class="sourceLineNo">198</span> Configuration conf = job.getConfiguration();<a name="line.198"></a>
-<span class="sourceLineNo">199</span> Map<ImmutableBytesWritable, List<ImmutableBytesWritable>> tableSplitKeys =<a name="line.199"></a>
-<span class="sourceLineNo">200</span> MultiHFilePartitioner.getTablesRegionStartKeys(conf, tables);<a name="line.200"></a>
-<span class="sourceLineNo">201</span> configureIncrementalLoad(job, tableSplitKeys, cls);<a name="line.201"></a>
-<span class="sourceLineNo">202</span> }<a name="line.202"></a>
-<span class="sourceLineNo">203</span><a name="line.203"></a>
-<span class="sourceLineNo">204</span> /**<a name="line.204"></a>
-<span class="sourceLineNo">205</span> * Same purpose as configureIncrementalLoad(Job job, List<TableName> tables)<a name="line.205"></a>
-<span class="sourceLineNo">206</span> * Used when region startKeys of each table is available, input as <TableName, List<RegionStartKey>><a name="line.206"></a>
-<span class="sourceLineNo">207</span> *<a name="line.207"></a>
-<span class="sourceLineNo">208</span> * Caller needs to transfer TableName and byte[] to ImmutableBytesWritable<a name="line.208"></a>
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-<span class="sourceLineNo">212</span> configureIncrementalLoad(job, tableSplitKeys, MultiTableHFileOutputFormat.class);<a name="line.212"></a>
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-<span class="sourceLineNo">214</span><a name="line.214"></a>
-<span class="sourceLineNo">215</span> public static void configureIncrementalLoad(Job job, Map<ImmutableBytesWritable,<a name="line.215"></a>
-<span class="sourceLineNo">216</span> List<ImmutableBytesWritable>> tableSplitKeys, Class<? extends OutputFormat<?, ?>> cls) throws IOException {<a name="line.216"></a>
-<span class="sourceLineNo">217</span> Configuration conf = job.getConfiguration();<a name="line.217"></a>
-<span class="sourceLineNo">218</span><a name="line.218"></a>
-<span class="sourceLineNo">219</span> // file path to store <table, splitKey><a name="line.219"></a>
-<span class="sourceLineNo">220</span> String hbaseTmpFsDir = conf.get(HConstants.TEMPORARY_FS_DIRECTORY_KEY,<a name="line.220"></a>
-<span class="sourceLineNo">221</span> HConstants.DEFAULT_TEMPORARY_HDFS_DIRECTORY);<a name="line.221"></a>
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-<span class="sourceLineNo">464</span> int index = Collections.binarySearch(list, rowKey, new ImmutableBytesWritable.Comparator());<a name="line.464"></a>
-<span class="sourceLineNo">465</span> if (index < 0) {<a name="line.465"></a>
-<span class="sourceLineNo">466</span> index = (index + 1) * (-1) - 1;<a name="line.466"></a>
-<span class="sourceLineNo">467</span> } else if (index == list.size()) {<a name="line.467"></a>
-<span class="sourceLineNo">468</span> index -= 1;<a name="line.468"></a>
-<span class="sourceLineNo">469</span> }<a name="line.469"></a>
-<span class="sourceLineNo">470</span> if (index < 0) {<a name="line.470"></a>
-<span class="sourceLineNo">471</span> index = 0;<a name="line.471"></a>
-<span class="sourceLineNo">472</span> LOG.error("row key can not less than HConstants.EMPTY_BYTE_ARRAY ");<a name="line.472"></a>
-<span class="sourceLineNo">473</span> }<a name="line.473"></a>
-<span class="sourceLineNo">474</span> splitId = list.get(index);<a name="line.474"></a>
-<span class="sourceLineNo">475</span> }<a name="line.475"></a>
-<span class="sourceLineNo">476</span><a name="line.476"></a>
-<span class="sourceLineNo">477</span> // find the id of the reducer for the input<a name="line.477"></a>
-<span class="sourceLineNo">478</span> Integer id = partitionMap.get(new TableSplitKeyPair(table, splitId));<a name="line.478"></a>
-<span class="sourceLineNo">479</span> if (id == null) {<a name="line.479"></a>
-<span class="sourceLineNo">480</span> LOG.warn("Can not get reducer id for input record");<a name="line.480"></a>
-<span class="sourceLineNo">481</span> return -1;<a name="line.481"></a>
-<span class="sourceLineNo">482</span> }<a name="line.482"></a>
-<span class="sourceLineNo">483</span> return id.intValue() % numPartitions;<a name="line.483"></a>
-<span class="sourceLineNo">484</span> }<a name="line.484"></a>
-<span class="sourceLineNo">485</span><a name="line.485"></a>
-<span class="sourceLineNo">486</span> /**<a name="line.486"></a>
-<span class="sourceLineNo">487</span> * A class store pair<TableName, SplitKey>, has two main usage<a name="line.487"></a>
-<span class="sourceLineNo">488</span> * 1. store tableName and one of its splitKey as a pair<a name="line.488"></a>
-<span class="sourceLineNo">489</span> * 2. implement comparable, so that partitioner can find splitKey of its input cell<a name="line.489"></a>
-<span class="sourceLineNo">490</span> */<a name="line.490"></a>
-<span class="sourceLineNo">491</span> static class TableSplitKeyPair extends Pair<ImmutableBytesWritable, ImmutableBytesWritable><a name="line.491"></a>
-<span class="sourceLineNo">492</span> implements Comparable<TableSplitKeyPair> {<a name="line.492"></a>
-<span class="sourceLineNo">493</span><a name="line.493"></a>
-<span class="sourceLineNo">494</span> private static final long serialVersionUID = -6485999667666325594L;<a name="line.494"></a>
-<span class="sourceLineNo">495</span><a name="line.495"></a>
-<span class="sourceLineNo">496</span> public TableSplitKeyPair(ImmutableBytesWritable a, ImmutableBytesWritable b) {<a name="line.496"></a>
-<span class="sourceLineNo">497</span> super(a, b);<a name="line.497"></a>
-<span class="sourceLineNo">498</span> }<a name="line.498"></a>
-<span class="sourceLineNo">499</span><a name="line.499"></a>
-<span class="sourceLineNo">500</span> @Override<a name="line.500"></a>
-<span class="sourceLineNo">501</span> public int compareTo(TableSplitKeyPair other) {<a name="line.501"></a>
-<span class="sourceLineNo">502</span> if (this.getFirst().equals(other.getFirst())) {<a name="line.502"></a>
-<span class="sourceLineNo">503</span> return this.getSecond().compareTo(other.getSecond());<a name="line.503"></a>
-<span class="sourceLineNo">504</span> }<a name="line.504"></a>
-<span class="sourceLineNo">505</span> return this.getFirst().compareTo(other.getFirst());<a name="line.505"></a>
-<span class="sourceLineNo">506</span> }<a name="line.506"></a>
-<span class="sourceLineNo">507</span> }<a name="line.507"></a>
-<span class="sourceLineNo">508</span> }<a name="line.508"></a>
-<span class="sourceLineNo">509</span>}<a name="line.509"></a>
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