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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>package org.apache.hadoop.hbase.mapreduce;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.util.Collections;<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.Locale;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.apache.hadoop.conf.Configurable;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span>import org.apache.hadoop.conf.Configuration;<a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.hadoop.hbase.CellUtil;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.apache.hadoop.hbase.TableName;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.apache.hadoop.hbase.client.Connection;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.hbase.client.ConnectionFactory;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.hbase.client.RegionLocator;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.client.Scan;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.mapreduce.InputSplit;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.mapreduce.Job;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span>import org.apache.hadoop.mapreduce.JobContext;<a name="line.36"></a> |
| <span class="sourceLineNo">037</span>import org.apache.hadoop.util.StringUtils;<a name="line.37"></a> |
| <span class="sourceLineNo">038</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.38"></a> |
| <span class="sourceLineNo">039</span>import org.slf4j.Logger;<a name="line.39"></a> |
| <span class="sourceLineNo">040</span>import org.slf4j.LoggerFactory;<a name="line.40"></a> |
| <span class="sourceLineNo">041</span><a name="line.41"></a> |
| <span class="sourceLineNo">042</span>/**<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> * Convert HBase tabular data into a format that is consumable by Map/Reduce.<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> */<a name="line.44"></a> |
| <span class="sourceLineNo">045</span>@InterfaceAudience.Public<a name="line.45"></a> |
| <span class="sourceLineNo">046</span>public class TableInputFormat extends TableInputFormatBase implements Configurable {<a name="line.46"></a> |
| <span class="sourceLineNo">047</span><a name="line.47"></a> |
| <span class="sourceLineNo">048</span> @SuppressWarnings("hiding")<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> private static final Logger LOG = LoggerFactory.getLogger(TableInputFormat.class);<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> /** Job parameter that specifies the input table. */<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> public static final String INPUT_TABLE = "hbase.mapreduce.inputtable";<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> /**<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> * If specified, use start keys of this table to split. This is useful when you are preparing data<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> * for bulkload.<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> */<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> private static final String SPLIT_TABLE = "hbase.mapreduce.splittable";<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> /**<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * Base-64 encoded scanner. All other SCAN_ confs are ignored if this is specified. See<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * {@link TableMapReduceUtil#convertScanToString(Scan)} for more details.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> */<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> public static final String SCAN = "hbase.mapreduce.scan";<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> /** Scan start row */<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> public static final String SCAN_ROW_START = "hbase.mapreduce.scan.row.start";<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> /** Scan stop row */<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> public static final String SCAN_ROW_STOP = "hbase.mapreduce.scan.row.stop";<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> /** Column Family to Scan */<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> public static final String SCAN_COLUMN_FAMILY = "hbase.mapreduce.scan.column.family";<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> /** Space delimited list of columns and column families to scan. */<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> public static final String SCAN_COLUMNS = "hbase.mapreduce.scan.columns";<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> /** The timestamp used to filter columns with a specific timestamp. */<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> public static final String SCAN_TIMESTAMP = "hbase.mapreduce.scan.timestamp";<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> /** The starting timestamp used to filter columns with a specific range of versions. */<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> public static final String SCAN_TIMERANGE_START = "hbase.mapreduce.scan.timerange.start";<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> /** The ending timestamp used to filter columns with a specific range of versions. */<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> public static final String SCAN_TIMERANGE_END = "hbase.mapreduce.scan.timerange.end";<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> /** The maximum number of version to return. */<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> public static final String SCAN_MAXVERSIONS = "hbase.mapreduce.scan.maxversions";<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> /** Set to false to disable server-side caching of blocks for this scan. */<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> public static final String SCAN_CACHEBLOCKS = "hbase.mapreduce.scan.cacheblocks";<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> /** The number of rows for caching that will be passed to scanners. */<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> public static final String SCAN_CACHEDROWS = "hbase.mapreduce.scan.cachedrows";<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> /** Set the maximum number of values to return for each call to next(). */<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> public static final String SCAN_BATCHSIZE = "hbase.mapreduce.scan.batchsize";<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> /** Specify if we have to shuffle the map tasks. */<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> public static final String SHUFFLE_MAPS = "hbase.mapreduce.inputtable.shufflemaps";<a name="line.86"></a> |
| <span class="sourceLineNo">087</span><a name="line.87"></a> |
| <span class="sourceLineNo">088</span> /** The configuration. */<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> private Configuration conf = null;<a name="line.89"></a> |
| <span class="sourceLineNo">090</span><a name="line.90"></a> |
| <span class="sourceLineNo">091</span> /**<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> * Returns the current configuration.<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> * @return The current configuration.<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> * @see org.apache.hadoop.conf.Configurable#getConf()<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> */<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> @Override<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> public Configuration getConf() {<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> return conf;<a name="line.98"></a> |
| <span class="sourceLineNo">099</span> }<a name="line.99"></a> |
| <span class="sourceLineNo">100</span><a name="line.100"></a> |
| <span class="sourceLineNo">101</span> /**<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> * Sets the configuration. This is used to set the details for the table to be scanned.<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> * @param configuration The configuration to set.<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> * @see org.apache.hadoop.conf.Configurable#setConf( org.apache.hadoop.conf.Configuration)<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> */<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> @Override<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "REC_CATCH_EXCEPTION",<a name="line.107"></a> |
| <span class="sourceLineNo">108</span> justification = "Intentional")<a name="line.108"></a> |
| <span class="sourceLineNo">109</span> public void setConf(Configuration configuration) {<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> this.conf = configuration;<a name="line.110"></a> |
| <span class="sourceLineNo">111</span><a name="line.111"></a> |
| <span class="sourceLineNo">112</span> Scan scan = null;<a name="line.112"></a> |
| <span class="sourceLineNo">113</span><a name="line.113"></a> |
| <span class="sourceLineNo">114</span> if (conf.get(SCAN) != null) {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> try {<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> scan = TableMapReduceUtil.convertStringToScan(conf.get(SCAN));<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> } catch (IOException e) {<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> LOG.error("An error occurred.", e);<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> }<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> } else {<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> try {<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> scan = createScanFromConfiguration(conf);<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> } catch (Exception e) {<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> LOG.error(StringUtils.stringifyException(e));<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> }<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> }<a name="line.126"></a> |
| <span class="sourceLineNo">127</span><a name="line.127"></a> |
| <span class="sourceLineNo">128</span> setScan(scan);<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> }<a name="line.129"></a> |
| <span class="sourceLineNo">130</span><a name="line.130"></a> |
| <span class="sourceLineNo">131</span> /**<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> * Sets up a {@link Scan} instance, applying settings from the configuration property constants<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> * defined in {@code TableInputFormat}. This allows specifying things such as:<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> * <ul><a name="line.134"></a> |
| <span class="sourceLineNo">135</span> * <li>start and stop rows</li><a name="line.135"></a> |
| <span class="sourceLineNo">136</span> * <li>column qualifiers or families</li><a name="line.136"></a> |
| <span class="sourceLineNo">137</span> * <li>timestamps or timerange</li><a name="line.137"></a> |
| <span class="sourceLineNo">138</span> * <li>scanner caching and batch size</li><a name="line.138"></a> |
| <span class="sourceLineNo">139</span> * </ul><a name="line.139"></a> |
| <span class="sourceLineNo">140</span> */<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> public static Scan createScanFromConfiguration(Configuration conf) throws IOException {<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> Scan scan = new Scan();<a name="line.142"></a> |
| <span class="sourceLineNo">143</span><a name="line.143"></a> |
| <span class="sourceLineNo">144</span> if (conf.get(SCAN_ROW_START) != null) {<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> scan.withStartRow(Bytes.toBytesBinary(conf.get(SCAN_ROW_START)));<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> }<a name="line.146"></a> |
| <span class="sourceLineNo">147</span><a name="line.147"></a> |
| <span class="sourceLineNo">148</span> if (conf.get(SCAN_ROW_STOP) != null) {<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> scan.withStopRow(Bytes.toBytesBinary(conf.get(SCAN_ROW_STOP)));<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> }<a name="line.150"></a> |
| <span class="sourceLineNo">151</span><a name="line.151"></a> |
| <span class="sourceLineNo">152</span> if (conf.get(SCAN_COLUMNS) != null) {<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> addColumns(scan, conf.get(SCAN_COLUMNS));<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> }<a name="line.154"></a> |
| <span class="sourceLineNo">155</span><a name="line.155"></a> |
| <span class="sourceLineNo">156</span> for (String columnFamily : conf.getTrimmedStrings(SCAN_COLUMN_FAMILY)) {<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> scan.addFamily(Bytes.toBytes(columnFamily));<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> }<a name="line.158"></a> |
| <span class="sourceLineNo">159</span><a name="line.159"></a> |
| <span class="sourceLineNo">160</span> if (conf.get(SCAN_TIMESTAMP) != null) {<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> scan.setTimestamp(Long.parseLong(conf.get(SCAN_TIMESTAMP)));<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> }<a name="line.162"></a> |
| <span class="sourceLineNo">163</span><a name="line.163"></a> |
| <span class="sourceLineNo">164</span> if (conf.get(SCAN_TIMERANGE_START) != null && conf.get(SCAN_TIMERANGE_END) != null) {<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> scan.setTimeRange(Long.parseLong(conf.get(SCAN_TIMERANGE_START)),<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> Long.parseLong(conf.get(SCAN_TIMERANGE_END)));<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> }<a name="line.167"></a> |
| <span class="sourceLineNo">168</span><a name="line.168"></a> |
| <span class="sourceLineNo">169</span> if (conf.get(SCAN_MAXVERSIONS) != null) {<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> scan.readVersions(Integer.parseInt(conf.get(SCAN_MAXVERSIONS)));<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> }<a name="line.171"></a> |
| <span class="sourceLineNo">172</span><a name="line.172"></a> |
| <span class="sourceLineNo">173</span> if (conf.get(SCAN_CACHEDROWS) != null) {<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> scan.setCaching(Integer.parseInt(conf.get(SCAN_CACHEDROWS)));<a name="line.174"></a> |
| <span class="sourceLineNo">175</span> }<a name="line.175"></a> |
| <span class="sourceLineNo">176</span><a name="line.176"></a> |
| <span class="sourceLineNo">177</span> if (conf.get(SCAN_BATCHSIZE) != null) {<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> scan.setBatch(Integer.parseInt(conf.get(SCAN_BATCHSIZE)));<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> }<a name="line.179"></a> |
| <span class="sourceLineNo">180</span><a name="line.180"></a> |
| <span class="sourceLineNo">181</span> // false by default, full table scans generate too much BC churn<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> scan.setCacheBlocks((conf.getBoolean(SCAN_CACHEBLOCKS, false)));<a name="line.182"></a> |
| <span class="sourceLineNo">183</span><a name="line.183"></a> |
| <span class="sourceLineNo">184</span> return scan;<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> }<a name="line.185"></a> |
| <span class="sourceLineNo">186</span><a name="line.186"></a> |
| <span class="sourceLineNo">187</span> @Override<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> protected void initialize(JobContext context) throws IOException {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> // Do we have to worry about mis-matches between the Configuration from setConf and the one<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> // in this context?<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> TableName tableName = TableName.valueOf(conf.get(INPUT_TABLE));<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> try {<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> initializeTable(ConnectionFactory.createConnection(new Configuration(conf)), tableName);<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> } catch (Exception e) {<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> LOG.error(StringUtils.stringifyException(e));<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> }<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> }<a name="line.197"></a> |
| <span class="sourceLineNo">198</span><a name="line.198"></a> |
| <span class="sourceLineNo">199</span> /**<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> * Parses a combined family and qualifier and adds either both or just the family in case there is<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> * no qualifier. This assumes the older colon divided notation, e.g. "family:qualifier".<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> * @param scan The Scan to update.<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> * @param familyAndQualifier family and qualifier<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> * @throws IllegalArgumentException When familyAndQualifier is invalid.<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> */<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> private static void addColumn(Scan scan, byte[] familyAndQualifier) {<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> byte[][] fq = CellUtil.parseColumn(familyAndQualifier);<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> if (fq.length == 1) {<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> scan.addFamily(fq[0]);<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> } else if (fq.length == 2) {<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> scan.addColumn(fq[0], fq[1]);<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> } else {<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> throw new IllegalArgumentException("Invalid familyAndQualifier provided.");<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> }<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> /**<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> * Adds an array of columns specified using old format, family:qualifier.<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> * <p><a name="line.219"></a> |
| <span class="sourceLineNo">220</span> * Overrides previous calls to {@link Scan#addColumn(byte[], byte[])}for any families in the<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> * input.<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> * @param scan The Scan to update.<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> * @param columns array of columns, formatted as <code>family:qualifier</code><a name="line.223"></a> |
| <span class="sourceLineNo">224</span> * @see Scan#addColumn(byte[], byte[])<a name="line.224"></a> |
| <span class="sourceLineNo">225</span> */<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> public static void addColumns(Scan scan, byte[][] columns) {<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> for (byte[] column : columns) {<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> addColumn(scan, column);<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> }<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> }<a name="line.230"></a> |
| <span class="sourceLineNo">231</span><a name="line.231"></a> |
| <span class="sourceLineNo">232</span> /**<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> * Calculates the splits that will serve as input for the map tasks. The number of splits matches<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> * the number of regions in a table. Splits are shuffled if required.<a name="line.234"></a> |
| <span class="sourceLineNo">235</span> * @param context The current job context.<a name="line.235"></a> |
| <span class="sourceLineNo">236</span> * @return The list of input splits.<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> * @throws IOException When creating the list of splits fails.<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits( org.apache.hadoop.mapreduce.JobContext)<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> */<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> @Override<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> public List<InputSplit> getSplits(JobContext context) throws IOException {<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> List<InputSplit> splits = super.getSplits(context);<a name="line.242"></a> |
| <span class="sourceLineNo">243</span> if (<a name="line.243"></a> |
| <span class="sourceLineNo">244</span> (conf.get(SHUFFLE_MAPS) != null)<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> && "true".equals(conf.get(SHUFFLE_MAPS).toLowerCase(Locale.ROOT))<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> ) {<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> Collections.shuffle(splits);<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span> return splits;<a name="line.249"></a> |
| <span class="sourceLineNo">250</span> }<a name="line.250"></a> |
| <span class="sourceLineNo">251</span><a name="line.251"></a> |
| <span class="sourceLineNo">252</span> /**<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> * Convenience method to parse a string representation of an array of column specifiers.<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> * @param scan The Scan to update.<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> * @param columns The columns to parse.<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> */<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> private static void addColumns(Scan scan, String columns) {<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> String[] cols = columns.split(" ");<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> for (String col : cols) {<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> addColumn(scan, Bytes.toBytes(col));<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> }<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> }<a name="line.262"></a> |
| <span class="sourceLineNo">263</span><a name="line.263"></a> |
| <span class="sourceLineNo">264</span> @Override<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> protected Pair<byte[][], byte[][]> getStartEndKeys() throws IOException {<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> if (conf.get(SPLIT_TABLE) != null) {<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> TableName splitTableName = TableName.valueOf(conf.get(SPLIT_TABLE));<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> try (Connection conn = ConnectionFactory.createConnection(getConf())) {<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> try (RegionLocator rl = conn.getRegionLocator(splitTableName)) {<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> return rl.getStartEndKeys();<a name="line.270"></a> |
| <span class="sourceLineNo">271</span> }<a name="line.271"></a> |
| <span class="sourceLineNo">272</span> }<a name="line.272"></a> |
| <span class="sourceLineNo">273</span> }<a name="line.273"></a> |
| <span class="sourceLineNo">274</span><a name="line.274"></a> |
| <span class="sourceLineNo">275</span> return super.getStartEndKeys();<a name="line.275"></a> |
| <span class="sourceLineNo">276</span> }<a name="line.276"></a> |
| <span class="sourceLineNo">277</span><a name="line.277"></a> |
| <span class="sourceLineNo">278</span> /**<a name="line.278"></a> |
| <span class="sourceLineNo">279</span> * Sets split table in map-reduce job.<a name="line.279"></a> |
| <span class="sourceLineNo">280</span> */<a name="line.280"></a> |
| <span class="sourceLineNo">281</span> public static void configureSplitTable(Job job, TableName tableName) {<a name="line.281"></a> |
| <span class="sourceLineNo">282</span> job.getConfiguration().set(SPLIT_TABLE, tableName.getNameAsString());<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> |
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| </pre> |
| </div> |
| </body> |
| </html> |
