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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<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.mapreduce;<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.Map.Entry;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.Map;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span><a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.slf4j.Logger;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.slf4j.LoggerFactory;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.Cell;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.KeyValue;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.KeyValueUtil;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.client.Put;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.mapreduce.Reducer;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span>/**<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> * Combine Puts. Merges Put instances grouped by <code>K</code> into a single<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> * instance.<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * @see TableMapReduceUtil<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> */<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>@InterfaceAudience.Public<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>public class PutCombiner<K> extends Reducer<K, Put, K, Put> {<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> private static final Logger LOG = LoggerFactory.getLogger(PutCombiner.class);<a name="line.42"></a> |
| <span class="sourceLineNo">043</span><a name="line.43"></a> |
| <span class="sourceLineNo">044</span> @Override<a name="line.44"></a> |
| <span class="sourceLineNo">045</span> protected void reduce(K row, Iterable<Put> vals, Context context)<a name="line.45"></a> |
| <span class="sourceLineNo">046</span> throws IOException, InterruptedException {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> // Using HeapSize to create an upper bound on the memory size of<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> // the puts and flush some portion of the content while looping. This<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> // flush could result in multiple Puts for a single rowkey. That is<a name="line.49"></a> |
| <span class="sourceLineNo">050</span> // acceptable because Combiner is run as an optimization and it's not<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> // critical that all Puts are grouped perfectly.<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> long threshold = context.getConfiguration().getLong(<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> "putcombiner.row.threshold", 1L * (1<<30));<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> int cnt = 0;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> long curSize = 0;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> Put put = null;<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> Map<byte[], List<Cell>> familyMap = null;<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> for (Put p : vals) {<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> cnt++;<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> if (put == null) {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> put = p;<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> familyMap = put.getFamilyCellMap();<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> } else {<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> for (Entry<byte[], List<Cell>> entry : p.getFamilyCellMap()<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> .entrySet()) {<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> List<Cell> cells = familyMap.get(entry.getKey());<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> List<Cell> kvs = (cells != null) ? (List<Cell>) cells : null;<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> for (Cell cell : entry.getValue()) {<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> KeyValue kv = KeyValueUtil.ensureKeyValue(cell);<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> curSize += kv.heapSize();<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> if (kvs != null) {<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> kvs.add(kv);<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> if (cells == null) {<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> familyMap.put(entry.getKey(), entry.getValue());<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> }<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> }<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> if (cnt % 10 == 0) context.setStatus("Combine " + cnt);<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> if (curSize > threshold) {<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> if (LOG.isDebugEnabled()) {<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> LOG.debug(String.format("Combined %d Put(s) into %d.", cnt, 1));<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> }<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> context.write(row, put);<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> put = null;<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> curSize = 0;<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> cnt = 0;<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> }<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> }<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> }<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> if (put != null) {<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> if (LOG.isDebugEnabled()) {<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> LOG.debug(String.format("Combined %d Put(s) into %d.", cnt, 1));<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> context.write(row, put);<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> }<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> }<a name="line.97"></a> |
| <span class="sourceLineNo">098</span>}<a name="line.98"></a> |
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