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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.Closeable;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.io.IOException;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.net.InetAddress;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.net.InetSocketAddress;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import java.net.UnknownHostException;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import java.util.ArrayList;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import java.util.HashMap;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import java.util.List;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span><a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.slf4j.Logger;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.slf4j.LoggerFactory;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.HConstants;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.HRegionLocation;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.TableName;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.hbase.client.Admin;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hadoop.hbase.client.Connection;<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.Result;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>import org.apache.hadoop.hbase.client.Table;<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>import org.apache.hadoop.hbase.exceptions.IllegalArgumentIOException;<a name="line.42"></a> |
| <span class="sourceLineNo">043</span>import org.apache.hadoop.hbase.io.ImmutableBytesWritable;<a name="line.43"></a> |
| <span class="sourceLineNo">044</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.Strings;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span>import org.apache.hadoop.mapreduce.InputFormat;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span>import org.apache.hadoop.mapreduce.InputSplit;<a name="line.49"></a> |
| <span class="sourceLineNo">050</span>import org.apache.hadoop.mapreduce.JobContext;<a name="line.50"></a> |
| <span class="sourceLineNo">051</span>import org.apache.hadoop.mapreduce.RecordReader;<a name="line.51"></a> |
| <span class="sourceLineNo">052</span>import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.52"></a> |
| <span class="sourceLineNo">053</span>import org.apache.hadoop.net.DNS;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span>import org.apache.hadoop.util.StringUtils;<a name="line.54"></a> |
| <span class="sourceLineNo">055</span>import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span>/**<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * A base for {@link TableInputFormat}s. Receives a {@link Connection}, a {@link TableName},<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * an {@link Scan} instance that defines the input columns etc. Subclasses may use<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * other TableRecordReader implementations.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> *<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> * Subclasses MUST ensure initializeTable(Connection, TableName) is called for an instance to<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> * function properly. Each of the entry points to this class used by the MapReduce framework,<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> * {@link #createRecordReader(InputSplit, TaskAttemptContext)} and {@link #getSplits(JobContext)},<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * will call {@link #initialize(JobContext)} as a convenient centralized location to handle<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * retrieving the necessary configuration information. If your subclass overrides either of these<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * methods, either call the parent version or call initialize yourself.<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> *<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * <p><a name="line.69"></a> |
| <span class="sourceLineNo">070</span> * An example of a subclass:<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * <pre><a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * class ExampleTIF extends TableInputFormatBase {<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> *<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * {@literal @}Override<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * protected void initialize(JobContext context) throws IOException {<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * // We are responsible for the lifecycle of this connection until we hand it over in<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * // initializeTable.<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> * Connection connection = ConnectionFactory.createConnection(HBaseConfiguration.create(<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * job.getConfiguration()));<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * TableName tableName = TableName.valueOf("exampleTable");<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * // mandatory. once passed here, TableInputFormatBase will handle closing the connection.<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> * initializeTable(connection, tableName);<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> * byte[][] inputColumns = new byte [][] { Bytes.toBytes("columnA"),<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> * Bytes.toBytes("columnB") };<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> * // optional, by default we'll get everything for the table.<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> * Scan scan = new Scan();<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> * for (byte[] family : inputColumns) {<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> * scan.addFamily(family);<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> * }<a name="line.89"></a> |
| <span class="sourceLineNo">090</span> * Filter exampleFilter = new RowFilter(CompareOp.EQUAL, new RegexStringComparator("aa.*"));<a name="line.90"></a> |
| <span class="sourceLineNo">091</span> * scan.setFilter(exampleFilter);<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> * setScan(scan);<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * }<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * }<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> * </pre><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> * The number of InputSplits(mappers) match the number of regions in a table by default.<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> * Set "hbase.mapreduce.tableinput.mappers.per.region" to specify how many mappers per region, set<a name="line.99"></a> |
| <span class="sourceLineNo">100</span> * this property will disable autobalance below.\<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> * Set "hbase.mapreduce.tif.input.autobalance" to enable autobalance, hbase will assign mappers<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * based on average region size; For regions, whose size larger than average region size may assigned<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * more mappers, and for smaller one, they may group together to use one mapper. If actual average<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * region size is too big, like 50G, it is not good to only assign 1 mapper for those large regions.<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> * Use "hbase.mapreduce.tif.ave.regionsize" to set max average region size when enable "autobalanece",<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> * default mas average region size is 8G.<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> */<a name="line.107"></a> |
| <span class="sourceLineNo">108</span>@InterfaceAudience.Public<a name="line.108"></a> |
| <span class="sourceLineNo">109</span>public abstract class TableInputFormatBase<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> extends InputFormat<ImmutableBytesWritable, Result> {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span><a name="line.111"></a> |
| <span class="sourceLineNo">112</span> private static final Logger LOG = LoggerFactory.getLogger(TableInputFormatBase.class);<a name="line.112"></a> |
| <span class="sourceLineNo">113</span><a name="line.113"></a> |
| <span class="sourceLineNo">114</span> private static final String NOT_INITIALIZED = "The input format instance has not been properly " +<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> "initialized. Ensure you call initializeTable either in your constructor or initialize " +<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> "method";<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> private static final String INITIALIZATION_ERROR = "Cannot create a record reader because of a" +<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> " previous error. Please look at the previous logs lines from" +<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> " the task's full log for more details.";<a name="line.119"></a> |
| <span class="sourceLineNo">120</span><a name="line.120"></a> |
| <span class="sourceLineNo">121</span> /** Specify if we enable auto-balance to set number of mappers in M/R jobs. */<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> public static final String MAPREDUCE_INPUT_AUTOBALANCE = "hbase.mapreduce.tif.input.autobalance";<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> /** In auto-balance, we split input by ave region size, if calculated region size is too big, we can set it. */<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> public static final String MAX_AVERAGE_REGION_SIZE = "hbase.mapreduce.tif.ave.regionsize";<a name="line.124"></a> |
| <span class="sourceLineNo">125</span><a name="line.125"></a> |
| <span class="sourceLineNo">126</span> /** Set the number of Mappers for each region, all regions have same number of Mappers */<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> public static final String NUM_MAPPERS_PER_REGION = "hbase.mapreduce.tableinput.mappers.per.region";<a name="line.127"></a> |
| <span class="sourceLineNo">128</span><a name="line.128"></a> |
| <span class="sourceLineNo">129</span><a name="line.129"></a> |
| <span class="sourceLineNo">130</span> /** Holds the details for the internal scanner.<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> *<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> * @see Scan */<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> private Scan scan = null;<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> /** The {@link Admin}. */<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> private Admin admin;<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> /** The {@link Table} to scan. */<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> private Table table;<a name="line.137"></a> |
| <span class="sourceLineNo">138</span> /** The {@link RegionLocator} of the table. */<a name="line.138"></a> |
| <span class="sourceLineNo">139</span> private RegionLocator regionLocator;<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> /** The reader scanning the table, can be a custom one. */<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> private TableRecordReader tableRecordReader = null;<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> /** The underlying {@link Connection} of the table. */<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> private Connection connection;<a name="line.143"></a> |
| <span class="sourceLineNo">144</span><a name="line.144"></a> |
| <span class="sourceLineNo">145</span><a name="line.145"></a> |
| <span class="sourceLineNo">146</span> /** The reverse DNS lookup cache mapping: IPAddress => HostName */<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> private HashMap<InetAddress, String> reverseDNSCacheMap =<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> new HashMap<>();<a name="line.148"></a> |
| <span class="sourceLineNo">149</span><a name="line.149"></a> |
| <span class="sourceLineNo">150</span> /**<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> * Builds a {@link TableRecordReader}. If no {@link TableRecordReader} was provided, uses<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> * the default.<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> *<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> * @param split The split to work with.<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> * @param context The current context.<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> * @return The newly created record reader.<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> * @throws IOException When creating the reader fails.<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> * @see org.apache.hadoop.mapreduce.InputFormat#createRecordReader(<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> * org.apache.hadoop.mapreduce.InputSplit,<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> * org.apache.hadoop.mapreduce.TaskAttemptContext)<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> */<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> @Override<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> public RecordReader<ImmutableBytesWritable, Result> createRecordReader(<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> InputSplit split, TaskAttemptContext context)<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> throws IOException {<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> if (table == null) {<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> initialize(context);<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> }<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> // null check in case our child overrides getTable to not throw.<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> try {<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> if (getTable() == null) {<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> // initialize() must not have been implemented in the subclass.<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> }<a name="line.175"></a> |
| <span class="sourceLineNo">176</span> } catch (IllegalStateException exception) {<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> }<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> TableSplit tSplit = (TableSplit) split;<a name="line.179"></a> |
| <span class="sourceLineNo">180</span> LOG.info("Input split length: " + StringUtils.humanReadableInt(tSplit.getLength()) + " bytes.");<a name="line.180"></a> |
| <span class="sourceLineNo">181</span> final TableRecordReader trr =<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> this.tableRecordReader != null ? this.tableRecordReader : new TableRecordReader();<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> Scan sc = new Scan(this.scan);<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> sc.setStartRow(tSplit.getStartRow());<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> sc.setStopRow(tSplit.getEndRow());<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> trr.setScan(sc);<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> trr.setTable(getTable());<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> return new RecordReader<ImmutableBytesWritable, Result>() {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span><a name="line.189"></a> |
| <span class="sourceLineNo">190</span> @Override<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> public void close() throws IOException {<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> trr.close();<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> closeTable();<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> }<a name="line.194"></a> |
| <span class="sourceLineNo">195</span><a name="line.195"></a> |
| <span class="sourceLineNo">196</span> @Override<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> public ImmutableBytesWritable getCurrentKey() throws IOException, InterruptedException {<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> return trr.getCurrentKey();<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> }<a name="line.199"></a> |
| <span class="sourceLineNo">200</span><a name="line.200"></a> |
| <span class="sourceLineNo">201</span> @Override<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> public Result getCurrentValue() throws IOException, InterruptedException {<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> return trr.getCurrentValue();<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> }<a name="line.204"></a> |
| <span class="sourceLineNo">205</span><a name="line.205"></a> |
| <span class="sourceLineNo">206</span> @Override<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> public float getProgress() throws IOException, InterruptedException {<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> return trr.getProgress();<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> }<a name="line.209"></a> |
| <span class="sourceLineNo">210</span><a name="line.210"></a> |
| <span class="sourceLineNo">211</span> @Override<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> public void initialize(InputSplit inputsplit, TaskAttemptContext context) throws IOException,<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> InterruptedException {<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> trr.initialize(inputsplit, context);<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> }<a name="line.215"></a> |
| <span class="sourceLineNo">216</span><a name="line.216"></a> |
| <span class="sourceLineNo">217</span> @Override<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> public boolean nextKeyValue() throws IOException, InterruptedException {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> return trr.nextKeyValue();<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> }<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> };<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> }<a name="line.222"></a> |
| <span class="sourceLineNo">223</span><a name="line.223"></a> |
| <span class="sourceLineNo">224</span> protected Pair<byte[][],byte[][]> getStartEndKeys() throws IOException {<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> return getRegionLocator().getStartEndKeys();<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> }<a name="line.226"></a> |
| <span class="sourceLineNo">227</span><a name="line.227"></a> |
| <span class="sourceLineNo">228</span> /**<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> * Calculates the splits that will serve as input for the map tasks.<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> * @param context The current job context.<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> * @return The list of input splits.<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> * @throws IOException When creating the list of splits fails.<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits(<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> * org.apache.hadoop.mapreduce.JobContext)<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> */<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> @Override<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> public List<InputSplit> getSplits(JobContext context) throws IOException {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> boolean closeOnFinish = false;<a name="line.238"></a> |
| <span class="sourceLineNo">239</span><a name="line.239"></a> |
| <span class="sourceLineNo">240</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> if (table == null) {<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> initialize(context);<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> closeOnFinish = true;<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> }<a name="line.244"></a> |
| <span class="sourceLineNo">245</span><a name="line.245"></a> |
| <span class="sourceLineNo">246</span> // null check in case our child overrides getTable to not throw.<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> try {<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> if (getTable() == null) {<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> // initialize() must not have been implemented in the subclass.<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> }<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> } catch (IllegalStateException exception) {<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> }<a name="line.254"></a> |
| <span class="sourceLineNo">255</span><a name="line.255"></a> |
| <span class="sourceLineNo">256</span> try {<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> List<InputSplit> splits = oneInputSplitPerRegion();<a name="line.257"></a> |
| <span class="sourceLineNo">258</span><a name="line.258"></a> |
| <span class="sourceLineNo">259</span> // set same number of mappers for each region<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> if (context.getConfiguration().get(NUM_MAPPERS_PER_REGION) != null) {<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> int nSplitsPerRegion = context.getConfiguration().getInt(NUM_MAPPERS_PER_REGION, 1);<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> List<InputSplit> res = new ArrayList<>();<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> for (int i = 0; i < splits.size(); i++) {<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> List<InputSplit> tmp = createNInputSplitsUniform(splits.get(i), nSplitsPerRegion);<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> res.addAll(tmp);<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> }<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> return res;<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> }<a name="line.268"></a> |
| <span class="sourceLineNo">269</span><a name="line.269"></a> |
| <span class="sourceLineNo">270</span> //The default value of "hbase.mapreduce.input.autobalance" is false.<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> if (context.getConfiguration().getBoolean(MAPREDUCE_INPUT_AUTOBALANCE, false)) {<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> long maxAveRegionSize = context.getConfiguration()<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> .getLong(MAX_AVERAGE_REGION_SIZE, 8L*1073741824); //8GB<a name="line.273"></a> |
| <span class="sourceLineNo">274</span> return calculateAutoBalancedSplits(splits, maxAveRegionSize);<a name="line.274"></a> |
| <span class="sourceLineNo">275</span> }<a name="line.275"></a> |
| <span class="sourceLineNo">276</span><a name="line.276"></a> |
| <span class="sourceLineNo">277</span> // return one mapper per region<a name="line.277"></a> |
| <span class="sourceLineNo">278</span> return splits;<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> } finally {<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> if (closeOnFinish) {<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> closeTable();<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> }<a name="line.282"></a> |
| <span class="sourceLineNo">283</span> }<a name="line.283"></a> |
| <span class="sourceLineNo">284</span> }<a name="line.284"></a> |
| <span class="sourceLineNo">285</span><a name="line.285"></a> |
| <span class="sourceLineNo">286</span> /**<a name="line.286"></a> |
| <span class="sourceLineNo">287</span> * Create one InputSplit per region<a name="line.287"></a> |
| <span class="sourceLineNo">288</span> *<a name="line.288"></a> |
| <span class="sourceLineNo">289</span> * @return The list of InputSplit for all the regions<a name="line.289"></a> |
| <span class="sourceLineNo">290</span> * @throws IOException<a name="line.290"></a> |
| <span class="sourceLineNo">291</span> */<a name="line.291"></a> |
| <span class="sourceLineNo">292</span> private List<InputSplit> oneInputSplitPerRegion() throws IOException {<a name="line.292"></a> |
| <span class="sourceLineNo">293</span> RegionSizeCalculator sizeCalculator =<a name="line.293"></a> |
| <span class="sourceLineNo">294</span> createRegionSizeCalculator(getRegionLocator(), getAdmin());<a name="line.294"></a> |
| <span class="sourceLineNo">295</span><a name="line.295"></a> |
| <span class="sourceLineNo">296</span> TableName tableName = getTable().getName();<a name="line.296"></a> |
| <span class="sourceLineNo">297</span><a name="line.297"></a> |
| <span class="sourceLineNo">298</span> Pair<byte[][], byte[][]> keys = getStartEndKeys();<a name="line.298"></a> |
| <span class="sourceLineNo">299</span> if (keys == null || keys.getFirst() == null ||<a name="line.299"></a> |
| <span class="sourceLineNo">300</span> keys.getFirst().length == 0) {<a name="line.300"></a> |
| <span class="sourceLineNo">301</span> HRegionLocation regLoc =<a name="line.301"></a> |
| <span class="sourceLineNo">302</span> getRegionLocator().getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);<a name="line.302"></a> |
| <span class="sourceLineNo">303</span> if (null == regLoc) {<a name="line.303"></a> |
| <span class="sourceLineNo">304</span> throw new IOException("Expecting at least one region.");<a name="line.304"></a> |
| <span class="sourceLineNo">305</span> }<a name="line.305"></a> |
| <span class="sourceLineNo">306</span> List<InputSplit> splits = new ArrayList<>(1);<a name="line.306"></a> |
| <span class="sourceLineNo">307</span> long regionSize = sizeCalculator.getRegionSize(regLoc.getRegion().getRegionName());<a name="line.307"></a> |
| <span class="sourceLineNo">308</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.308"></a> |
| <span class="sourceLineNo">309</span> HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY, regLoc<a name="line.309"></a> |
| <span class="sourceLineNo">310</span> .getHostnamePort().split(Addressing.HOSTNAME_PORT_SEPARATOR)[0], regionSize);<a name="line.310"></a> |
| <span class="sourceLineNo">311</span> splits.add(split);<a name="line.311"></a> |
| <span class="sourceLineNo">312</span> return splits;<a name="line.312"></a> |
| <span class="sourceLineNo">313</span> }<a name="line.313"></a> |
| <span class="sourceLineNo">314</span> List<InputSplit> splits = new ArrayList<>(keys.getFirst().length);<a name="line.314"></a> |
| <span class="sourceLineNo">315</span> for (int i = 0; i < keys.getFirst().length; i++) {<a name="line.315"></a> |
| <span class="sourceLineNo">316</span> if (!includeRegionInSplit(keys.getFirst()[i], keys.getSecond()[i])) {<a name="line.316"></a> |
| <span class="sourceLineNo">317</span> continue;<a name="line.317"></a> |
| <span class="sourceLineNo">318</span> }<a name="line.318"></a> |
| <span class="sourceLineNo">319</span><a name="line.319"></a> |
| <span class="sourceLineNo">320</span> byte[] startRow = scan.getStartRow();<a name="line.320"></a> |
| <span class="sourceLineNo">321</span> byte[] stopRow = scan.getStopRow();<a name="line.321"></a> |
| <span class="sourceLineNo">322</span> // determine if the given start an stop key fall into the region<a name="line.322"></a> |
| <span class="sourceLineNo">323</span> if ((startRow.length == 0 || keys.getSecond()[i].length == 0 ||<a name="line.323"></a> |
| <span class="sourceLineNo">324</span> Bytes.compareTo(startRow, keys.getSecond()[i]) < 0) &&<a name="line.324"></a> |
| <span class="sourceLineNo">325</span> (stopRow.length == 0 ||<a name="line.325"></a> |
| <span class="sourceLineNo">326</span> Bytes.compareTo(stopRow, keys.getFirst()[i]) > 0)) {<a name="line.326"></a> |
| <span class="sourceLineNo">327</span> byte[] splitStart = startRow.length == 0 ||<a name="line.327"></a> |
| <span class="sourceLineNo">328</span> Bytes.compareTo(keys.getFirst()[i], startRow) >= 0 ?<a name="line.328"></a> |
| <span class="sourceLineNo">329</span> keys.getFirst()[i] : startRow;<a name="line.329"></a> |
| <span class="sourceLineNo">330</span> byte[] splitStop = (stopRow.length == 0 ||<a name="line.330"></a> |
| <span class="sourceLineNo">331</span> Bytes.compareTo(keys.getSecond()[i], stopRow) <= 0) &&<a name="line.331"></a> |
| <span class="sourceLineNo">332</span> keys.getSecond()[i].length > 0 ?<a name="line.332"></a> |
| <span class="sourceLineNo">333</span> keys.getSecond()[i] : stopRow;<a name="line.333"></a> |
| <span class="sourceLineNo">334</span><a name="line.334"></a> |
| <span class="sourceLineNo">335</span> HRegionLocation location = getRegionLocator().getRegionLocation(keys.getFirst()[i], false);<a name="line.335"></a> |
| <span class="sourceLineNo">336</span> // The below InetSocketAddress creation does a name resolution.<a name="line.336"></a> |
| <span class="sourceLineNo">337</span> InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());<a name="line.337"></a> |
| <span class="sourceLineNo">338</span> if (isa.isUnresolved()) {<a name="line.338"></a> |
| <span class="sourceLineNo">339</span> LOG.warn("Failed resolve " + isa);<a name="line.339"></a> |
| <span class="sourceLineNo">340</span> }<a name="line.340"></a> |
| <span class="sourceLineNo">341</span> InetAddress regionAddress = isa.getAddress();<a name="line.341"></a> |
| <span class="sourceLineNo">342</span> String regionLocation;<a name="line.342"></a> |
| <span class="sourceLineNo">343</span> regionLocation = reverseDNS(regionAddress);<a name="line.343"></a> |
| <span class="sourceLineNo">344</span><a name="line.344"></a> |
| <span class="sourceLineNo">345</span> byte[] regionName = location.getRegion().getRegionName();<a name="line.345"></a> |
| <span class="sourceLineNo">346</span> String encodedRegionName = location.getRegion().getEncodedName();<a name="line.346"></a> |
| <span class="sourceLineNo">347</span> long regionSize = sizeCalculator.getRegionSize(regionName);<a name="line.347"></a> |
| <span class="sourceLineNo">348</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.348"></a> |
| <span class="sourceLineNo">349</span> splitStart, splitStop, regionLocation, encodedRegionName, regionSize);<a name="line.349"></a> |
| <span class="sourceLineNo">350</span> splits.add(split);<a name="line.350"></a> |
| <span class="sourceLineNo">351</span> if (LOG.isDebugEnabled()) {<a name="line.351"></a> |
| <span class="sourceLineNo">352</span> LOG.debug("getSplits: split -> " + i + " -> " + split);<a name="line.352"></a> |
| <span class="sourceLineNo">353</span> }<a name="line.353"></a> |
| <span class="sourceLineNo">354</span> }<a name="line.354"></a> |
| <span class="sourceLineNo">355</span> }<a name="line.355"></a> |
| <span class="sourceLineNo">356</span> return splits;<a name="line.356"></a> |
| <span class="sourceLineNo">357</span> }<a name="line.357"></a> |
| <span class="sourceLineNo">358</span><a name="line.358"></a> |
| <span class="sourceLineNo">359</span> /**<a name="line.359"></a> |
| <span class="sourceLineNo">360</span> * Create n splits for one InputSplit, For now only support uniform distribution<a name="line.360"></a> |
| <span class="sourceLineNo">361</span> * @param split A TableSplit corresponding to a range of rowkeys<a name="line.361"></a> |
| <span class="sourceLineNo">362</span> * @param n Number of ranges after splitting. Pass 1 means no split for the range<a name="line.362"></a> |
| <span class="sourceLineNo">363</span> * Pass 2 if you want to split the range in two;<a name="line.363"></a> |
| <span class="sourceLineNo">364</span> * @return A list of TableSplit, the size of the list is n<a name="line.364"></a> |
| <span class="sourceLineNo">365</span> * @throws IllegalArgumentIOException<a name="line.365"></a> |
| <span class="sourceLineNo">366</span> */<a name="line.366"></a> |
| <span class="sourceLineNo">367</span> protected List<InputSplit> createNInputSplitsUniform(InputSplit split, int n)<a name="line.367"></a> |
| <span class="sourceLineNo">368</span> throws IllegalArgumentIOException {<a name="line.368"></a> |
| <span class="sourceLineNo">369</span> if (split == null || !(split instanceof TableSplit)) {<a name="line.369"></a> |
| <span class="sourceLineNo">370</span> throw new IllegalArgumentIOException(<a name="line.370"></a> |
| <span class="sourceLineNo">371</span> "InputSplit for CreateNSplitsPerRegion can not be null + "<a name="line.371"></a> |
| <span class="sourceLineNo">372</span> + "and should be instance of TableSplit");<a name="line.372"></a> |
| <span class="sourceLineNo">373</span> }<a name="line.373"></a> |
| <span class="sourceLineNo">374</span> //if n < 1, then still continue using n = 1<a name="line.374"></a> |
| <span class="sourceLineNo">375</span> n = n < 1 ? 1 : n;<a name="line.375"></a> |
| <span class="sourceLineNo">376</span> List<InputSplit> res = new ArrayList<>(n);<a name="line.376"></a> |
| <span class="sourceLineNo">377</span> if (n == 1) {<a name="line.377"></a> |
| <span class="sourceLineNo">378</span> res.add(split);<a name="line.378"></a> |
| <span class="sourceLineNo">379</span> return res;<a name="line.379"></a> |
| <span class="sourceLineNo">380</span> }<a name="line.380"></a> |
| <span class="sourceLineNo">381</span><a name="line.381"></a> |
| <span class="sourceLineNo">382</span> // Collect Region related information<a name="line.382"></a> |
| <span class="sourceLineNo">383</span> TableSplit ts = (TableSplit) split;<a name="line.383"></a> |
| <span class="sourceLineNo">384</span> TableName tableName = ts.getTable();<a name="line.384"></a> |
| <span class="sourceLineNo">385</span> String regionLocation = ts.getRegionLocation();<a name="line.385"></a> |
| <span class="sourceLineNo">386</span> String encodedRegionName = ts.getEncodedRegionName();<a name="line.386"></a> |
| <span class="sourceLineNo">387</span> long regionSize = ts.getLength();<a name="line.387"></a> |
| <span class="sourceLineNo">388</span> byte[] startRow = ts.getStartRow();<a name="line.388"></a> |
| <span class="sourceLineNo">389</span> byte[] endRow = ts.getEndRow();<a name="line.389"></a> |
| <span class="sourceLineNo">390</span><a name="line.390"></a> |
| <span class="sourceLineNo">391</span> // For special case: startRow or endRow is empty<a name="line.391"></a> |
| <span class="sourceLineNo">392</span> if (startRow.length == 0 && endRow.length == 0){<a name="line.392"></a> |
| <span class="sourceLineNo">393</span> startRow = new byte[1];<a name="line.393"></a> |
| <span class="sourceLineNo">394</span> endRow = new byte[1];<a name="line.394"></a> |
| <span class="sourceLineNo">395</span> startRow[0] = 0;<a name="line.395"></a> |
| <span class="sourceLineNo">396</span> endRow[0] = -1;<a name="line.396"></a> |
| <span class="sourceLineNo">397</span> }<a name="line.397"></a> |
| <span class="sourceLineNo">398</span> if (startRow.length == 0 && endRow.length != 0){<a name="line.398"></a> |
| <span class="sourceLineNo">399</span> startRow = new byte[1];<a name="line.399"></a> |
| <span class="sourceLineNo">400</span> startRow[0] = 0;<a name="line.400"></a> |
| <span class="sourceLineNo">401</span> }<a name="line.401"></a> |
| <span class="sourceLineNo">402</span> if (startRow.length != 0 && endRow.length == 0){<a name="line.402"></a> |
| <span class="sourceLineNo">403</span> endRow =new byte[startRow.length];<a name="line.403"></a> |
| <span class="sourceLineNo">404</span> for (int k = 0; k < startRow.length; k++){<a name="line.404"></a> |
| <span class="sourceLineNo">405</span> endRow[k] = -1;<a name="line.405"></a> |
| <span class="sourceLineNo">406</span> }<a name="line.406"></a> |
| <span class="sourceLineNo">407</span> }<a name="line.407"></a> |
| <span class="sourceLineNo">408</span><a name="line.408"></a> |
| <span class="sourceLineNo">409</span> // Split Region into n chunks evenly<a name="line.409"></a> |
| <span class="sourceLineNo">410</span> byte[][] splitKeys = Bytes.split(startRow, endRow, true, n-1);<a name="line.410"></a> |
| <span class="sourceLineNo">411</span> for (int i = 0; i < splitKeys.length - 1; i++) {<a name="line.411"></a> |
| <span class="sourceLineNo">412</span> //notice that the regionSize parameter may be not very accurate<a name="line.412"></a> |
| <span class="sourceLineNo">413</span> TableSplit tsplit =<a name="line.413"></a> |
| <span class="sourceLineNo">414</span> new TableSplit(tableName, scan, splitKeys[i], splitKeys[i + 1], regionLocation,<a name="line.414"></a> |
| <span class="sourceLineNo">415</span> encodedRegionName, regionSize / n);<a name="line.415"></a> |
| <span class="sourceLineNo">416</span> res.add(tsplit);<a name="line.416"></a> |
| <span class="sourceLineNo">417</span> }<a name="line.417"></a> |
| <span class="sourceLineNo">418</span> return res;<a name="line.418"></a> |
| <span class="sourceLineNo">419</span> }<a name="line.419"></a> |
| <span class="sourceLineNo">420</span> /**<a name="line.420"></a> |
| <span class="sourceLineNo">421</span> * Calculates the number of MapReduce input splits for the map tasks. The number of<a name="line.421"></a> |
| <span class="sourceLineNo">422</span> * MapReduce input splits depends on the average region size.<a name="line.422"></a> |
| <span class="sourceLineNo">423</span> * Make it 'public' for testing<a name="line.423"></a> |
| <span class="sourceLineNo">424</span> *<a name="line.424"></a> |
| <span class="sourceLineNo">425</span> * @param splits The list of input splits before balance.<a name="line.425"></a> |
| <span class="sourceLineNo">426</span> * @param maxAverageRegionSize max Average region size for one mapper<a name="line.426"></a> |
| <span class="sourceLineNo">427</span> * @return The list of input splits.<a name="line.427"></a> |
| <span class="sourceLineNo">428</span> * @throws IOException When creating the list of splits fails.<a name="line.428"></a> |
| <span class="sourceLineNo">429</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits(<a name="line.429"></a> |
| <span class="sourceLineNo">430</span> *org.apache.hadoop.mapreduce.JobContext)<a name="line.430"></a> |
| <span class="sourceLineNo">431</span> */<a name="line.431"></a> |
| <span class="sourceLineNo">432</span> public List<InputSplit> calculateAutoBalancedSplits(List<InputSplit> splits, long maxAverageRegionSize)<a name="line.432"></a> |
| <span class="sourceLineNo">433</span> throws IOException {<a name="line.433"></a> |
| <span class="sourceLineNo">434</span> if (splits.size() == 0) {<a name="line.434"></a> |
| <span class="sourceLineNo">435</span> return splits;<a name="line.435"></a> |
| <span class="sourceLineNo">436</span> }<a name="line.436"></a> |
| <span class="sourceLineNo">437</span> List<InputSplit> resultList = new ArrayList<>();<a name="line.437"></a> |
| <span class="sourceLineNo">438</span> long totalRegionSize = 0;<a name="line.438"></a> |
| <span class="sourceLineNo">439</span> for (int i = 0; i < splits.size(); i++) {<a name="line.439"></a> |
| <span class="sourceLineNo">440</span> TableSplit ts = (TableSplit) splits.get(i);<a name="line.440"></a> |
| <span class="sourceLineNo">441</span> totalRegionSize += ts.getLength();<a name="line.441"></a> |
| <span class="sourceLineNo">442</span> }<a name="line.442"></a> |
| <span class="sourceLineNo">443</span> long averageRegionSize = totalRegionSize / splits.size();<a name="line.443"></a> |
| <span class="sourceLineNo">444</span> // totalRegionSize might be overflow, and the averageRegionSize must be positive.<a name="line.444"></a> |
| <span class="sourceLineNo">445</span> if (averageRegionSize <= 0) {<a name="line.445"></a> |
| <span class="sourceLineNo">446</span> LOG.warn("The averageRegionSize is not positive: " + averageRegionSize + ", " +<a name="line.446"></a> |
| <span class="sourceLineNo">447</span> "set it to Long.MAX_VALUE " + splits.size());<a name="line.447"></a> |
| <span class="sourceLineNo">448</span> averageRegionSize = Long.MAX_VALUE / splits.size();<a name="line.448"></a> |
| <span class="sourceLineNo">449</span> }<a name="line.449"></a> |
| <span class="sourceLineNo">450</span> //if averageRegionSize is too big, change it to default as 1 GB,<a name="line.450"></a> |
| <span class="sourceLineNo">451</span> if (averageRegionSize > maxAverageRegionSize) {<a name="line.451"></a> |
| <span class="sourceLineNo">452</span> averageRegionSize = maxAverageRegionSize;<a name="line.452"></a> |
| <span class="sourceLineNo">453</span> }<a name="line.453"></a> |
| <span class="sourceLineNo">454</span> // if averageRegionSize is too small, we do not need to allocate more mappers for those 'large' region<a name="line.454"></a> |
| <span class="sourceLineNo">455</span> // set default as 16M = (default hdfs block size) / 4;<a name="line.455"></a> |
| <span class="sourceLineNo">456</span> if (averageRegionSize < 16 * 1048576) {<a name="line.456"></a> |
| <span class="sourceLineNo">457</span> return splits;<a name="line.457"></a> |
| <span class="sourceLineNo">458</span> }<a name="line.458"></a> |
| <span class="sourceLineNo">459</span> for (int i = 0; i < splits.size(); i++) {<a name="line.459"></a> |
| <span class="sourceLineNo">460</span> TableSplit ts = (TableSplit) splits.get(i);<a name="line.460"></a> |
| <span class="sourceLineNo">461</span> TableName tableName = ts.getTable();<a name="line.461"></a> |
| <span class="sourceLineNo">462</span> String regionLocation = ts.getRegionLocation();<a name="line.462"></a> |
| <span class="sourceLineNo">463</span> String encodedRegionName = ts.getEncodedRegionName();<a name="line.463"></a> |
| <span class="sourceLineNo">464</span> long regionSize = ts.getLength();<a name="line.464"></a> |
| <span class="sourceLineNo">465</span><a name="line.465"></a> |
| <span class="sourceLineNo">466</span> if (regionSize >= averageRegionSize) {<a name="line.466"></a> |
| <span class="sourceLineNo">467</span> // make this region as multiple MapReduce input split.<a name="line.467"></a> |
| <span class="sourceLineNo">468</span> int n = (int) Math.round(Math.log(((double) regionSize) / ((double) averageRegionSize)) + 1.0);<a name="line.468"></a> |
| <span class="sourceLineNo">469</span> List<InputSplit> temp = createNInputSplitsUniform(ts, n);<a name="line.469"></a> |
| <span class="sourceLineNo">470</span> resultList.addAll(temp);<a name="line.470"></a> |
| <span class="sourceLineNo">471</span> } else {<a name="line.471"></a> |
| <span class="sourceLineNo">472</span> // if the total size of several small continuous regions less than the average region size,<a name="line.472"></a> |
| <span class="sourceLineNo">473</span> // combine them into one MapReduce input split.<a name="line.473"></a> |
| <span class="sourceLineNo">474</span> long totalSize = regionSize;<a name="line.474"></a> |
| <span class="sourceLineNo">475</span> byte[] splitStartKey = ts.getStartRow();<a name="line.475"></a> |
| <span class="sourceLineNo">476</span> byte[] splitEndKey = ts.getEndRow();<a name="line.476"></a> |
| <span class="sourceLineNo">477</span> int j = i + 1;<a name="line.477"></a> |
| <span class="sourceLineNo">478</span> while (j < splits.size()) {<a name="line.478"></a> |
| <span class="sourceLineNo">479</span> TableSplit nextRegion = (TableSplit) splits.get(j);<a name="line.479"></a> |
| <span class="sourceLineNo">480</span> long nextRegionSize = nextRegion.getLength();<a name="line.480"></a> |
| <span class="sourceLineNo">481</span> if (totalSize + nextRegionSize <= averageRegionSize<a name="line.481"></a> |
| <span class="sourceLineNo">482</span> && Bytes.equals(splitEndKey, nextRegion.getStartRow())) {<a name="line.482"></a> |
| <span class="sourceLineNo">483</span> totalSize = totalSize + nextRegionSize;<a name="line.483"></a> |
| <span class="sourceLineNo">484</span> splitEndKey = nextRegion.getEndRow();<a name="line.484"></a> |
| <span class="sourceLineNo">485</span> j++;<a name="line.485"></a> |
| <span class="sourceLineNo">486</span> } else {<a name="line.486"></a> |
| <span class="sourceLineNo">487</span> break;<a name="line.487"></a> |
| <span class="sourceLineNo">488</span> }<a name="line.488"></a> |
| <span class="sourceLineNo">489</span> }<a name="line.489"></a> |
| <span class="sourceLineNo">490</span> i = j - 1;<a name="line.490"></a> |
| <span class="sourceLineNo">491</span> TableSplit t = new TableSplit(tableName, scan, splitStartKey, splitEndKey, regionLocation,<a name="line.491"></a> |
| <span class="sourceLineNo">492</span> encodedRegionName, totalSize);<a name="line.492"></a> |
| <span class="sourceLineNo">493</span> resultList.add(t);<a name="line.493"></a> |
| <span class="sourceLineNo">494</span> }<a name="line.494"></a> |
| <span class="sourceLineNo">495</span> }<a name="line.495"></a> |
| <span class="sourceLineNo">496</span> return resultList;<a name="line.496"></a> |
| <span class="sourceLineNo">497</span> }<a name="line.497"></a> |
| <span class="sourceLineNo">498</span><a name="line.498"></a> |
| <span class="sourceLineNo">499</span> String reverseDNS(InetAddress ipAddress) throws UnknownHostException {<a name="line.499"></a> |
| <span class="sourceLineNo">500</span> String hostName = this.reverseDNSCacheMap.get(ipAddress);<a name="line.500"></a> |
| <span class="sourceLineNo">501</span> if (hostName == null) {<a name="line.501"></a> |
| <span class="sourceLineNo">502</span> String ipAddressString = null;<a name="line.502"></a> |
| <span class="sourceLineNo">503</span> try {<a name="line.503"></a> |
| <span class="sourceLineNo">504</span> ipAddressString = DNS.reverseDns(ipAddress, null);<a name="line.504"></a> |
| <span class="sourceLineNo">505</span> } catch (Exception e) {<a name="line.505"></a> |
| <span class="sourceLineNo">506</span> // We can use InetAddress in case the jndi failed to pull up the reverse DNS entry from the<a name="line.506"></a> |
| <span class="sourceLineNo">507</span> // name service. Also, in case of ipv6, we need to use the InetAddress since resolving<a name="line.507"></a> |
| <span class="sourceLineNo">508</span> // reverse DNS using jndi doesn't work well with ipv6 addresses.<a name="line.508"></a> |
| <span class="sourceLineNo">509</span> ipAddressString = InetAddress.getByName(ipAddress.getHostAddress()).getHostName();<a name="line.509"></a> |
| <span class="sourceLineNo">510</span> }<a name="line.510"></a> |
| <span class="sourceLineNo">511</span> if (ipAddressString == null) throw new UnknownHostException("No host found for " + ipAddress);<a name="line.511"></a> |
| <span class="sourceLineNo">512</span> hostName = Strings.domainNamePointerToHostName(ipAddressString);<a name="line.512"></a> |
| <span class="sourceLineNo">513</span> this.reverseDNSCacheMap.put(ipAddress, hostName);<a name="line.513"></a> |
| <span class="sourceLineNo">514</span> }<a name="line.514"></a> |
| <span class="sourceLineNo">515</span> return hostName;<a name="line.515"></a> |
| <span class="sourceLineNo">516</span> }<a name="line.516"></a> |
| <span class="sourceLineNo">517</span><a name="line.517"></a> |
| <span class="sourceLineNo">518</span> /**<a name="line.518"></a> |
| <span class="sourceLineNo">519</span> * Test if the given region is to be included in the InputSplit while splitting<a name="line.519"></a> |
| <span class="sourceLineNo">520</span> * the regions of a table.<a name="line.520"></a> |
| <span class="sourceLineNo">521</span> * <p><a name="line.521"></a> |
| <span class="sourceLineNo">522</span> * This optimization is effective when there is a specific reasoning to exclude an entire region from the M-R job,<a name="line.522"></a> |
| <span class="sourceLineNo">523</span> * (and hence, not contributing to the InputSplit), given the start and end keys of the same. <br><a name="line.523"></a> |
| <span class="sourceLineNo">524</span> * Useful when we need to remember the last-processed top record and revisit the [last, current) interval for M-R processing,<a name="line.524"></a> |
| <span class="sourceLineNo">525</span> * continuously. In addition to reducing InputSplits, reduces the load on the region server as well, due to the ordering of the keys.<a name="line.525"></a> |
| <span class="sourceLineNo">526</span> * <br><a name="line.526"></a> |
| <span class="sourceLineNo">527</span> * <br><a name="line.527"></a> |
| <span class="sourceLineNo">528</span> * Note: It is possible that <code>endKey.length() == 0 </code> , for the last (recent) region.<a name="line.528"></a> |
| <span class="sourceLineNo">529</span> * <br><a name="line.529"></a> |
| <span class="sourceLineNo">530</span> * Override this method, if you want to bulk exclude regions altogether from M-R. By default, no region is excluded( i.e. all regions are included).<a name="line.530"></a> |
| <span class="sourceLineNo">531</span> *<a name="line.531"></a> |
| <span class="sourceLineNo">532</span> *<a name="line.532"></a> |
| <span class="sourceLineNo">533</span> * @param startKey Start key of the region<a name="line.533"></a> |
| <span class="sourceLineNo">534</span> * @param endKey End key of the region<a name="line.534"></a> |
| <span class="sourceLineNo">535</span> * @return true, if this region needs to be included as part of the input (default).<a name="line.535"></a> |
| <span class="sourceLineNo">536</span> *<a name="line.536"></a> |
| <span class="sourceLineNo">537</span> */<a name="line.537"></a> |
| <span class="sourceLineNo">538</span> protected boolean includeRegionInSplit(final byte[] startKey, final byte [] endKey) {<a name="line.538"></a> |
| <span class="sourceLineNo">539</span> return true;<a name="line.539"></a> |
| <span class="sourceLineNo">540</span> }<a name="line.540"></a> |
| <span class="sourceLineNo">541</span><a name="line.541"></a> |
| <span class="sourceLineNo">542</span> /**<a name="line.542"></a> |
| <span class="sourceLineNo">543</span> * Allows subclasses to get the {@link RegionLocator}.<a name="line.543"></a> |
| <span class="sourceLineNo">544</span> */<a name="line.544"></a> |
| <span class="sourceLineNo">545</span> protected RegionLocator getRegionLocator() {<a name="line.545"></a> |
| <span class="sourceLineNo">546</span> if (regionLocator == null) {<a name="line.546"></a> |
| <span class="sourceLineNo">547</span> throw new IllegalStateException(NOT_INITIALIZED);<a name="line.547"></a> |
| <span class="sourceLineNo">548</span> }<a name="line.548"></a> |
| <span class="sourceLineNo">549</span> return regionLocator;<a name="line.549"></a> |
| <span class="sourceLineNo">550</span> }<a name="line.550"></a> |
| <span class="sourceLineNo">551</span><a name="line.551"></a> |
| <span class="sourceLineNo">552</span> /**<a name="line.552"></a> |
| <span class="sourceLineNo">553</span> * Allows subclasses to get the {@link Table}.<a name="line.553"></a> |
| <span class="sourceLineNo">554</span> */<a name="line.554"></a> |
| <span class="sourceLineNo">555</span> protected Table getTable() {<a name="line.555"></a> |
| <span class="sourceLineNo">556</span> if (table == null) {<a name="line.556"></a> |
| <span class="sourceLineNo">557</span> throw new IllegalStateException(NOT_INITIALIZED);<a name="line.557"></a> |
| <span class="sourceLineNo">558</span> }<a name="line.558"></a> |
| <span class="sourceLineNo">559</span> return table;<a name="line.559"></a> |
| <span class="sourceLineNo">560</span> }<a name="line.560"></a> |
| <span class="sourceLineNo">561</span><a name="line.561"></a> |
| <span class="sourceLineNo">562</span> /**<a name="line.562"></a> |
| <span class="sourceLineNo">563</span> * Allows subclasses to get the {@link Admin}.<a name="line.563"></a> |
| <span class="sourceLineNo">564</span> */<a name="line.564"></a> |
| <span class="sourceLineNo">565</span> protected Admin getAdmin() {<a name="line.565"></a> |
| <span class="sourceLineNo">566</span> if (admin == null) {<a name="line.566"></a> |
| <span class="sourceLineNo">567</span> throw new IllegalStateException(NOT_INITIALIZED);<a name="line.567"></a> |
| <span class="sourceLineNo">568</span> }<a name="line.568"></a> |
| <span class="sourceLineNo">569</span> return admin;<a name="line.569"></a> |
| <span class="sourceLineNo">570</span> }<a name="line.570"></a> |
| <span class="sourceLineNo">571</span><a name="line.571"></a> |
| <span class="sourceLineNo">572</span> /**<a name="line.572"></a> |
| <span class="sourceLineNo">573</span> * Allows subclasses to initialize the table information.<a name="line.573"></a> |
| <span class="sourceLineNo">574</span> *<a name="line.574"></a> |
| <span class="sourceLineNo">575</span> * @param connection The Connection to the HBase cluster. MUST be unmanaged. We will close.<a name="line.575"></a> |
| <span class="sourceLineNo">576</span> * @param tableName The {@link TableName} of the table to process.<a name="line.576"></a> |
| <span class="sourceLineNo">577</span> * @throws IOException<a name="line.577"></a> |
| <span class="sourceLineNo">578</span> */<a name="line.578"></a> |
| <span class="sourceLineNo">579</span> protected void initializeTable(Connection connection, TableName tableName) throws IOException {<a name="line.579"></a> |
| <span class="sourceLineNo">580</span> if (this.table != null || this.connection != null) {<a name="line.580"></a> |
| <span class="sourceLineNo">581</span> LOG.warn("initializeTable called multiple times. Overwriting connection and table " +<a name="line.581"></a> |
| <span class="sourceLineNo">582</span> "reference; TableInputFormatBase will not close these old references when done.");<a name="line.582"></a> |
| <span class="sourceLineNo">583</span> }<a name="line.583"></a> |
| <span class="sourceLineNo">584</span> this.table = connection.getTable(tableName);<a name="line.584"></a> |
| <span class="sourceLineNo">585</span> this.regionLocator = connection.getRegionLocator(tableName);<a name="line.585"></a> |
| <span class="sourceLineNo">586</span> this.admin = connection.getAdmin();<a name="line.586"></a> |
| <span class="sourceLineNo">587</span> this.connection = connection;<a name="line.587"></a> |
| <span class="sourceLineNo">588</span> }<a name="line.588"></a> |
| <span class="sourceLineNo">589</span><a name="line.589"></a> |
| <span class="sourceLineNo">590</span> @VisibleForTesting<a name="line.590"></a> |
| <span class="sourceLineNo">591</span> protected RegionSizeCalculator createRegionSizeCalculator(RegionLocator locator, Admin admin)<a name="line.591"></a> |
| <span class="sourceLineNo">592</span> throws IOException {<a name="line.592"></a> |
| <span class="sourceLineNo">593</span> return new RegionSizeCalculator(locator, admin);<a name="line.593"></a> |
| <span class="sourceLineNo">594</span> }<a name="line.594"></a> |
| <span class="sourceLineNo">595</span><a name="line.595"></a> |
| <span class="sourceLineNo">596</span> /**<a name="line.596"></a> |
| <span class="sourceLineNo">597</span> * Gets the scan defining the actual details like columns etc.<a name="line.597"></a> |
| <span class="sourceLineNo">598</span> *<a name="line.598"></a> |
| <span class="sourceLineNo">599</span> * @return The internal scan instance.<a name="line.599"></a> |
| <span class="sourceLineNo">600</span> */<a name="line.600"></a> |
| <span class="sourceLineNo">601</span> public Scan getScan() {<a name="line.601"></a> |
| <span class="sourceLineNo">602</span> if (this.scan == null) this.scan = new Scan();<a name="line.602"></a> |
| <span class="sourceLineNo">603</span> return scan;<a name="line.603"></a> |
| <span class="sourceLineNo">604</span> }<a name="line.604"></a> |
| <span class="sourceLineNo">605</span><a name="line.605"></a> |
| <span class="sourceLineNo">606</span> /**<a name="line.606"></a> |
| <span class="sourceLineNo">607</span> * Sets the scan defining the actual details like columns etc.<a name="line.607"></a> |
| <span class="sourceLineNo">608</span> *<a name="line.608"></a> |
| <span class="sourceLineNo">609</span> * @param scan The scan to set.<a name="line.609"></a> |
| <span class="sourceLineNo">610</span> */<a name="line.610"></a> |
| <span class="sourceLineNo">611</span> public void setScan(Scan scan) {<a name="line.611"></a> |
| <span class="sourceLineNo">612</span> this.scan = scan;<a name="line.612"></a> |
| <span class="sourceLineNo">613</span> }<a name="line.613"></a> |
| <span class="sourceLineNo">614</span><a name="line.614"></a> |
| <span class="sourceLineNo">615</span> /**<a name="line.615"></a> |
| <span class="sourceLineNo">616</span> * Allows subclasses to set the {@link TableRecordReader}.<a name="line.616"></a> |
| <span class="sourceLineNo">617</span> *<a name="line.617"></a> |
| <span class="sourceLineNo">618</span> * @param tableRecordReader A different {@link TableRecordReader}<a name="line.618"></a> |
| <span class="sourceLineNo">619</span> * implementation.<a name="line.619"></a> |
| <span class="sourceLineNo">620</span> */<a name="line.620"></a> |
| <span class="sourceLineNo">621</span> protected void setTableRecordReader(TableRecordReader tableRecordReader) {<a name="line.621"></a> |
| <span class="sourceLineNo">622</span> this.tableRecordReader = tableRecordReader;<a name="line.622"></a> |
| <span class="sourceLineNo">623</span> }<a name="line.623"></a> |
| <span class="sourceLineNo">624</span><a name="line.624"></a> |
| <span class="sourceLineNo">625</span> /**<a name="line.625"></a> |
| <span class="sourceLineNo">626</span> * Handle subclass specific set up.<a name="line.626"></a> |
| <span class="sourceLineNo">627</span> * Each of the entry points used by the MapReduce framework,<a name="line.627"></a> |
| <span class="sourceLineNo">628</span> * {@link #createRecordReader(InputSplit, TaskAttemptContext)} and {@link #getSplits(JobContext)},<a name="line.628"></a> |
| <span class="sourceLineNo">629</span> * will call {@link #initialize(JobContext)} as a convenient centralized location to handle<a name="line.629"></a> |
| <span class="sourceLineNo">630</span> * retrieving the necessary configuration information and calling<a name="line.630"></a> |
| <span class="sourceLineNo">631</span> * {@link #initializeTable(Connection, TableName)}.<a name="line.631"></a> |
| <span class="sourceLineNo">632</span> *<a name="line.632"></a> |
| <span class="sourceLineNo">633</span> * Subclasses should implement their initialize call such that it is safe to call multiple times.<a name="line.633"></a> |
| <span class="sourceLineNo">634</span> * The current TableInputFormatBase implementation relies on a non-null table reference to decide<a name="line.634"></a> |
| <span class="sourceLineNo">635</span> * if an initialize call is needed, but this behavior may change in the future. In particular,<a name="line.635"></a> |
| <span class="sourceLineNo">636</span> * it is critical that initializeTable not be called multiple times since this will leak<a name="line.636"></a> |
| <span class="sourceLineNo">637</span> * Connection instances.<a name="line.637"></a> |
| <span class="sourceLineNo">638</span> *<a name="line.638"></a> |
| <span class="sourceLineNo">639</span> */<a name="line.639"></a> |
| <span class="sourceLineNo">640</span> protected void initialize(JobContext context) throws IOException {<a name="line.640"></a> |
| <span class="sourceLineNo">641</span> }<a name="line.641"></a> |
| <span class="sourceLineNo">642</span><a name="line.642"></a> |
| <span class="sourceLineNo">643</span> /**<a name="line.643"></a> |
| <span class="sourceLineNo">644</span> * Close the Table and related objects that were initialized via<a name="line.644"></a> |
| <span class="sourceLineNo">645</span> * {@link #initializeTable(Connection, TableName)}.<a name="line.645"></a> |
| <span class="sourceLineNo">646</span> *<a name="line.646"></a> |
| <span class="sourceLineNo">647</span> * @throws IOException<a name="line.647"></a> |
| <span class="sourceLineNo">648</span> */<a name="line.648"></a> |
| <span class="sourceLineNo">649</span> protected void closeTable() throws IOException {<a name="line.649"></a> |
| <span class="sourceLineNo">650</span> close(admin, table, regionLocator, connection);<a name="line.650"></a> |
| <span class="sourceLineNo">651</span> admin = null;<a name="line.651"></a> |
| <span class="sourceLineNo">652</span> table = null;<a name="line.652"></a> |
| <span class="sourceLineNo">653</span> regionLocator = null;<a name="line.653"></a> |
| <span class="sourceLineNo">654</span> connection = null;<a name="line.654"></a> |
| <span class="sourceLineNo">655</span> }<a name="line.655"></a> |
| <span class="sourceLineNo">656</span><a name="line.656"></a> |
| <span class="sourceLineNo">657</span> private void close(Closeable... closables) throws IOException {<a name="line.657"></a> |
| <span class="sourceLineNo">658</span> for (Closeable c : closables) {<a name="line.658"></a> |
| <span class="sourceLineNo">659</span> if(c != null) { c.close(); }<a name="line.659"></a> |
| <span class="sourceLineNo">660</span> }<a name="line.660"></a> |
| <span class="sourceLineNo">661</span> }<a name="line.661"></a> |
| <span class="sourceLineNo">662</span><a name="line.662"></a> |
| <span class="sourceLineNo">663</span>}<a name="line.663"></a> |
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| </div> |
| </body> |
| </html> |
