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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.mapreduce;</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.util.Base64;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.hadoop.conf.Configurable;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.hbase.io.ImmutableBytesWritable;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.util.Bytes;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.mapreduce.Partitioner;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.slf4j.Logger;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">/**</span> |
| <span class="source-line-no">031</span><span id="line-31"> * A partitioner that takes start and end keys and uses bigdecimal to figure which reduce a key</span> |
| <span class="source-line-no">032</span><span id="line-32"> * belongs to. Pass the start and end keys in the Configuration using {@value #START_BASE64} and</span> |
| <span class="source-line-no">033</span><span id="line-33"> * {@value #END_BASE64}. The end key needs to be exclusive; i.e. one larger than the biggest key in</span> |
| <span class="source-line-no">034</span><span id="line-34"> * your key space. You may be surprised at how this class partitions the space; it may not align</span> |
| <span class="source-line-no">035</span><span id="line-35"> * with preconceptions; e.g. a start key of zero and an end key of 100 divided in ten will not make</span> |
| <span class="source-line-no">036</span><span id="line-36"> * regions whose range is 0-10, 10-20, and so on. Make your own partitioner if you need the region</span> |
| <span class="source-line-no">037</span><span id="line-37"> * spacing to come out a particular way.</span> |
| <span class="source-line-no">038</span><span id="line-38"> * @see #START_BASE64</span> |
| <span class="source-line-no">039</span><span id="line-39"> * @see #END_BASE64</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.Public</span> |
| <span class="source-line-no">042</span><span id="line-42">public class SimpleTotalOrderPartitioner<VALUE> extends Partitioner<ImmutableBytesWritable, VALUE></span> |
| <span class="source-line-no">043</span><span id="line-43"> implements Configurable {</span> |
| <span class="source-line-no">044</span><span id="line-44"> private final static Logger LOG = LoggerFactory.getLogger(SimpleTotalOrderPartitioner.class);</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> static final String START_BASE64 = "hbase.simpletotalorder.start.base64";</span> |
| <span class="source-line-no">047</span><span id="line-47"> static final String END_BASE64 = "hbase.simpletotalorder.end.base64";</span> |
| <span class="source-line-no">048</span><span id="line-48"></span> |
| <span class="source-line-no">049</span><span id="line-49"> private Configuration c;</span> |
| <span class="source-line-no">050</span><span id="line-50"> private byte[] startkey;</span> |
| <span class="source-line-no">051</span><span id="line-51"> private byte[] endkey;</span> |
| <span class="source-line-no">052</span><span id="line-52"> private byte[][] splits;</span> |
| <span class="source-line-no">053</span><span id="line-53"> private int lastReduces = -1;</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> public static void setStartKey(Configuration conf, byte[] startKey) {</span> |
| <span class="source-line-no">056</span><span id="line-56"> conf.set(START_BASE64, Bytes.toString(Base64.getEncoder().encode(startKey)));</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> public static void setEndKey(Configuration conf, byte[] endKey) {</span> |
| <span class="source-line-no">060</span><span id="line-60"> conf.set(END_BASE64, Bytes.toString(Base64.getEncoder().encode(endKey)));</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"> static byte[] getStartKey(Configuration conf) {</span> |
| <span class="source-line-no">064</span><span id="line-64"> return getBase64KeyFromConf(conf, START_BASE64);</span> |
| <span class="source-line-no">065</span><span id="line-65"> }</span> |
| <span class="source-line-no">066</span><span id="line-66"></span> |
| <span class="source-line-no">067</span><span id="line-67"> static byte[] getEndKey(Configuration conf) {</span> |
| <span class="source-line-no">068</span><span id="line-68"> return getBase64KeyFromConf(conf, END_BASE64);</span> |
| <span class="source-line-no">069</span><span id="line-69"> }</span> |
| <span class="source-line-no">070</span><span id="line-70"></span> |
| <span class="source-line-no">071</span><span id="line-71"> private static byte[] getBase64KeyFromConf(Configuration conf, String base64Key) {</span> |
| <span class="source-line-no">072</span><span id="line-72"> String encoded = conf.get(base64Key);</span> |
| <span class="source-line-no">073</span><span id="line-73"> if (encoded != null) {</span> |
| <span class="source-line-no">074</span><span id="line-74"> return Base64.getDecoder().decode(encoded);</span> |
| <span class="source-line-no">075</span><span id="line-75"> }</span> |
| <span class="source-line-no">076</span><span id="line-76"> return null;</span> |
| <span class="source-line-no">077</span><span id="line-77"> }</span> |
| <span class="source-line-no">078</span><span id="line-78"></span> |
| <span class="source-line-no">079</span><span id="line-79"> @Override</span> |
| <span class="source-line-no">080</span><span id="line-80"> public int getPartition(final ImmutableBytesWritable key, final VALUE value, final int reduces) {</span> |
| <span class="source-line-no">081</span><span id="line-81"> if (reduces == 1) return 0;</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (this.lastReduces != reduces) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> this.splits = Bytes.split(this.startkey, this.endkey, reduces - 1);</span> |
| <span class="source-line-no">084</span><span id="line-84"> for (int i = 0; i < splits.length; i++) {</span> |
| <span class="source-line-no">085</span><span id="line-85"> LOG.info(Bytes.toStringBinary(splits[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"> this.lastReduces = reduces;</span> |
| <span class="source-line-no">088</span><span id="line-88"> }</span> |
| <span class="source-line-no">089</span><span id="line-89"> int pos = Bytes.binarySearch(this.splits, key.get(), key.getOffset(), key.getLength());</span> |
| <span class="source-line-no">090</span><span id="line-90"> // Below code is from hfile index search.</span> |
| <span class="source-line-no">091</span><span id="line-91"> if (pos < 0) {</span> |
| <span class="source-line-no">092</span><span id="line-92"> pos++;</span> |
| <span class="source-line-no">093</span><span id="line-93"> pos *= -1;</span> |
| <span class="source-line-no">094</span><span id="line-94"> if (pos == 0) {</span> |
| <span class="source-line-no">095</span><span id="line-95"> // falls before the beginning of the file.</span> |
| <span class="source-line-no">096</span><span id="line-96"> throw new RuntimeException("Key outside start/stop range: " + key.toString());</span> |
| <span class="source-line-no">097</span><span id="line-97"> }</span> |
| <span class="source-line-no">098</span><span id="line-98"> pos--;</span> |
| <span class="source-line-no">099</span><span id="line-99"> }</span> |
| <span class="source-line-no">100</span><span id="line-100"> return pos;</span> |
| <span class="source-line-no">101</span><span id="line-101"> }</span> |
| <span class="source-line-no">102</span><span id="line-102"></span> |
| <span class="source-line-no">103</span><span id="line-103"> @Override</span> |
| <span class="source-line-no">104</span><span id="line-104"> public Configuration getConf() {</span> |
| <span class="source-line-no">105</span><span id="line-105"> return this.c;</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"> @Override</span> |
| <span class="source-line-no">109</span><span id="line-109"> public void setConf(Configuration conf) {</span> |
| <span class="source-line-no">110</span><span id="line-110"> this.c = conf;</span> |
| <span class="source-line-no">111</span><span id="line-111"> this.startkey = getStartKey(conf);</span> |
| <span class="source-line-no">112</span><span id="line-112"> this.endkey = getEndKey(conf);</span> |
| <span class="source-line-no">113</span><span id="line-113"> if (startkey == null || endkey == null) {</span> |
| <span class="source-line-no">114</span><span id="line-114"> throw new RuntimeException(this.getClass() + " not configured");</span> |
| <span class="source-line-no">115</span><span id="line-115"> }</span> |
| <span class="source-line-no">116</span><span id="line-116"> LOG.info(</span> |
| <span class="source-line-no">117</span><span id="line-117"> "startkey=" + Bytes.toStringBinary(startkey) + ", endkey=" + Bytes.toStringBinary(endkey));</span> |
| <span class="source-line-no">118</span><span id="line-118"> // Reset last reduces count on change of Start / End key</span> |
| <span class="source-line-no">119</span><span id="line-119"> this.lastReduces = -1;</span> |
| <span class="source-line-no">120</span><span id="line-120"> }</span> |
| <span class="source-line-no">121</span><span id="line-121">}</span> |
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| </pre> |
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