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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.mapred;</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 org.apache.hadoop.hbase.HBaseConfiguration;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.hbase.TableName;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.client.Connection;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.client.ConnectionFactory;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.client.RegionLocator;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.io.ImmutableBytesWritable;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.mapred.JobConf;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.hadoop.mapred.Partitioner;</span> |
| <span class="source-line-no">030</span><span id="line-30">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">031</span><span id="line-31">import org.slf4j.Logger;</span> |
| <span class="source-line-no">032</span><span id="line-32">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">033</span><span id="line-33"></span> |
| <span class="source-line-no">034</span><span id="line-34">/**</span> |
| <span class="source-line-no">035</span><span id="line-35"> * This is used to partition the output keys into groups of keys. Keys are grouped according to the</span> |
| <span class="source-line-no">036</span><span id="line-36"> * regions that currently exist so that each reducer fills a single region so load is distributed.</span> |
| <span class="source-line-no">037</span><span id="line-37"> * @param <K2></span> |
| <span class="source-line-no">038</span><span id="line-38"> * @param <V2></span> |
| <span class="source-line-no">039</span><span id="line-39"> */</span> |
| <span class="source-line-no">040</span><span id="line-40">@InterfaceAudience.Public</span> |
| <span class="source-line-no">041</span><span id="line-41">public class HRegionPartitioner<K2, V2> implements Partitioner<ImmutableBytesWritable, V2> {</span> |
| <span class="source-line-no">042</span><span id="line-42"> private static final Logger LOG = LoggerFactory.getLogger(HRegionPartitioner.class);</span> |
| <span class="source-line-no">043</span><span id="line-43"> // Connection and locator are not cleaned up; they just die when partitioner is done.</span> |
| <span class="source-line-no">044</span><span id="line-44"> private Connection connection;</span> |
| <span class="source-line-no">045</span><span id="line-45"> private RegionLocator locator;</span> |
| <span class="source-line-no">046</span><span id="line-46"> private byte[][] startKeys;</span> |
| <span class="source-line-no">047</span><span id="line-47"></span> |
| <span class="source-line-no">048</span><span id="line-48"> @Override</span> |
| <span class="source-line-no">049</span><span id="line-49"> public void configure(JobConf job) {</span> |
| <span class="source-line-no">050</span><span id="line-50"> try {</span> |
| <span class="source-line-no">051</span><span id="line-51"> this.connection = ConnectionFactory.createConnection(HBaseConfiguration.create(job));</span> |
| <span class="source-line-no">052</span><span id="line-52"> TableName tableName = TableName.valueOf(job.get(TableOutputFormat.OUTPUT_TABLE));</span> |
| <span class="source-line-no">053</span><span id="line-53"> this.locator = this.connection.getRegionLocator(tableName);</span> |
| <span class="source-line-no">054</span><span id="line-54"> } catch (IOException e) {</span> |
| <span class="source-line-no">055</span><span id="line-55"> LOG.error(e.toString(), e);</span> |
| <span class="source-line-no">056</span><span id="line-56"> }</span> |
| <span class="source-line-no">057</span><span id="line-57"></span> |
| <span class="source-line-no">058</span><span id="line-58"> try {</span> |
| <span class="source-line-no">059</span><span id="line-59"> this.startKeys = this.locator.getStartKeys();</span> |
| <span class="source-line-no">060</span><span id="line-60"> } catch (IOException e) {</span> |
| <span class="source-line-no">061</span><span id="line-61"> LOG.error(e.toString(), e);</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"></span> |
| <span class="source-line-no">065</span><span id="line-65"> @Override</span> |
| <span class="source-line-no">066</span><span id="line-66"> public int getPartition(ImmutableBytesWritable key, V2 value, int numPartitions) {</span> |
| <span class="source-line-no">067</span><span id="line-67"> byte[] region = null;</span> |
| <span class="source-line-no">068</span><span id="line-68"> // Only one region return 0</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (this.startKeys.length == 1) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> return 0;</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"> try {</span> |
| <span class="source-line-no">073</span><span id="line-73"> // Not sure if this is cached after a split so we could have problems</span> |
| <span class="source-line-no">074</span><span id="line-74"> // here if a region splits while mapping</span> |
| <span class="source-line-no">075</span><span id="line-75"> region = locator.getRegionLocation(key.get()).getRegion().getStartKey();</span> |
| <span class="source-line-no">076</span><span id="line-76"> } catch (IOException e) {</span> |
| <span class="source-line-no">077</span><span id="line-77"> LOG.error(e.toString(), e);</span> |
| <span class="source-line-no">078</span><span id="line-78"> }</span> |
| <span class="source-line-no">079</span><span id="line-79"> for (int i = 0; i < this.startKeys.length; i++) {</span> |
| <span class="source-line-no">080</span><span id="line-80"> if (Bytes.compareTo(region, this.startKeys[i]) == 0) {</span> |
| <span class="source-line-no">081</span><span id="line-81"> if (i >= numPartitions) {</span> |
| <span class="source-line-no">082</span><span id="line-82"> // cover if we have less reduces then regions.</span> |
| <span class="source-line-no">083</span><span id="line-83"> return (Integer.toString(i).hashCode() & Integer.MAX_VALUE) % numPartitions;</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"> return i;</span> |
| <span class="source-line-no">086</span><span id="line-86"> }</span> |
| <span class="source-line-no">087</span><span id="line-87"> }</span> |
| <span class="source-line-no">088</span><span id="line-88"> // if above fails to find start key that match we need to return something</span> |
| <span class="source-line-no">089</span><span id="line-89"> return 0;</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> |
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| </pre> |
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