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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><a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.Arrays;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span><a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.slf4j.Logger;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.slf4j.LoggerFactory;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span><a name="line.27"></a> |
| <span class="sourceLineNo">028</span>/**<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> * A custom RegionSplitPolicy implementing a SplitPolicy that groups<a name="line.29"></a> |
| <span class="sourceLineNo">030</span> * rows by a prefix of the row-key with a delimiter. Only the first delimiter<a name="line.30"></a> |
| <span class="sourceLineNo">031</span> * for the row key will define the prefix of the row key that is used for grouping.<a name="line.31"></a> |
| <span class="sourceLineNo">032</span> *<a name="line.32"></a> |
| <span class="sourceLineNo">033</span> * This ensures that a region is not split "inside" a prefix of a row key.<a name="line.33"></a> |
| <span class="sourceLineNo">034</span> * I.e. rows can be co-located in a region by their prefix.<a name="line.34"></a> |
| <span class="sourceLineNo">035</span> *<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * As an example, if you have row keys delimited with <code>_</code>, like<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * <code>userid_eventtype_eventid</code>, and use prefix delimiter _, this split policy<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * ensures that all rows starting with the same userid, belongs to the same region.<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * @see KeyPrefixRegionSplitPolicy<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> */<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>@InterfaceAudience.Private<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>public class DelimitedKeyPrefixRegionSplitPolicy extends IncreasingToUpperBoundRegionSplitPolicy {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> private static final Logger LOG = LoggerFactory<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> .getLogger(DelimitedKeyPrefixRegionSplitPolicy.class);<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> public static final String DELIMITER_KEY = "DelimitedKeyPrefixRegionSplitPolicy.delimiter";<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private byte[] delimiter = null;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> @Override<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> protected void configureForRegion(HRegion region) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> super.configureForRegion(region);<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> // read the prefix length from the table descriptor<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> String delimiterString = region.getTableDescriptor().getValue(DELIMITER_KEY);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> if (delimiterString == null || delimiterString.length() == 0) {<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> LOG.error(DELIMITER_KEY + " not specified for table " +<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> region.getTableDescriptor().getTableName() + ". Using default RegionSplitPolicy");<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> return;<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> }<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> delimiter = Bytes.toBytes(delimiterString);<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> @Override<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> protected byte[] getSplitPoint() {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> byte[] splitPoint = super.getSplitPoint();<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> if (splitPoint != null && delimiter != null) {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span><a name="line.67"></a> |
| <span class="sourceLineNo">068</span> //find the first occurrence of delimiter in split point<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> int index =<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> org.apache.hbase.thirdparty.com.google.common.primitives.Bytes.indexOf(splitPoint, delimiter);<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> if (index < 0) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> LOG.warn("Delimiter " + Bytes.toString(delimiter) + " not found for split key "<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> + Bytes.toString(splitPoint));<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> return splitPoint;<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> }<a name="line.75"></a> |
| <span class="sourceLineNo">076</span><a name="line.76"></a> |
| <span class="sourceLineNo">077</span> // group split keys by a prefix<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> return Arrays.copyOf(splitPoint, Math.min(index, splitPoint.length));<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> } else {<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> return splitPoint;<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> }<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> }<a name="line.82"></a> |
| <span class="sourceLineNo">083</span>}<a name="line.83"></a> |
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