http://git-wip-us.apache.org/repos/asf/hbase-site/blob/ebf9a8b8/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html ---------------------------------------------------------------------- diff --git a/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html b/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html index 28784f5..a3ad745 100644 --- a/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html +++ b/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html @@ -53,612 +53,611 @@ <span class="sourceLineNo">045</span>import org.apache.hadoop.hbase.util.Addressing;<a name="line.45"></a> <span class="sourceLineNo">046</span>import org.apache.hadoop.hbase.util.Bytes;<a name="line.46"></a> <span class="sourceLineNo">047</span>import org.apache.hadoop.hbase.util.Pair;<a name="line.47"></a> -<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.RegionSizeCalculator;<a name="line.48"></a> -<span class="sourceLineNo">049</span>import org.apache.hadoop.hbase.util.Strings;<a name="line.49"></a> -<span class="sourceLineNo">050</span>import org.apache.hadoop.mapreduce.InputFormat;<a name="line.50"></a> -<span class="sourceLineNo">051</span>import org.apache.hadoop.mapreduce.InputSplit;<a name="line.51"></a> -<span class="sourceLineNo">052</span>import org.apache.hadoop.mapreduce.JobContext;<a name="line.52"></a> -<span class="sourceLineNo">053</span>import org.apache.hadoop.mapreduce.RecordReader;<a name="line.53"></a> -<span class="sourceLineNo">054</span>import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.54"></a> -<span class="sourceLineNo">055</span>import org.apache.hadoop.net.DNS;<a name="line.55"></a> -<span class="sourceLineNo">056</span>import org.apache.hadoop.util.StringUtils;<a name="line.56"></a> -<span class="sourceLineNo">057</span><a name="line.57"></a> -<span class="sourceLineNo">058</span>/**<a name="line.58"></a> -<span class="sourceLineNo">059</span> * A base for {@link TableInputFormat}s. Receives a {@link Connection}, a {@link TableName},<a name="line.59"></a> -<span class="sourceLineNo">060</span> * an {@link Scan} instance that defines the input columns etc. Subclasses may use<a name="line.60"></a> -<span class="sourceLineNo">061</span> * other TableRecordReader implementations.<a name="line.61"></a> -<span class="sourceLineNo">062</span> *<a name="line.62"></a> -<span class="sourceLineNo">063</span> * Subclasses MUST ensure initializeTable(Connection, TableName) is called for an instance to<a name="line.63"></a> -<span class="sourceLineNo">064</span> * function properly. Each of the entry points to this class used by the MapReduce framework,<a name="line.64"></a> -<span class="sourceLineNo">065</span> * {@link #createRecordReader(InputSplit, TaskAttemptContext)} and {@link #getSplits(JobContext)},<a name="line.65"></a> -<span class="sourceLineNo">066</span> * will call {@link #initialize(JobContext)} as a convenient centralized location to handle<a name="line.66"></a> -<span class="sourceLineNo">067</span> * retrieving the necessary configuration information. If your subclass overrides either of these<a name="line.67"></a> -<span class="sourceLineNo">068</span> * methods, either call the parent version or call initialize yourself.<a name="line.68"></a> -<span class="sourceLineNo">069</span> *<a name="line.69"></a> -<span class="sourceLineNo">070</span> * <p><a name="line.70"></a> -<span class="sourceLineNo">071</span> * An example of a subclass:<a name="line.71"></a> -<span class="sourceLineNo">072</span> * <pre><a name="line.72"></a> -<span class="sourceLineNo">073</span> * class ExampleTIF extends TableInputFormatBase {<a name="line.73"></a> -<span class="sourceLineNo">074</span> *<a name="line.74"></a> -<span class="sourceLineNo">075</span> * {@literal @}Override<a name="line.75"></a> -<span class="sourceLineNo">076</span> * protected void initialize(JobContext context) throws IOException {<a name="line.76"></a> -<span class="sourceLineNo">077</span> * // We are responsible for the lifecycle of this connection until we hand it over in<a name="line.77"></a> -<span class="sourceLineNo">078</span> * // initializeTable.<a name="line.78"></a> -<span class="sourceLineNo">079</span> * Connection connection = ConnectionFactory.createConnection(HBaseConfiguration.create(<a name="line.79"></a> -<span class="sourceLineNo">080</span> * job.getConfiguration()));<a name="line.80"></a> -<span class="sourceLineNo">081</span> * TableName tableName = TableName.valueOf("exampleTable");<a name="line.81"></a> -<span class="sourceLineNo">082</span> * // mandatory. once passed here, TableInputFormatBase will handle closing the connection.<a name="line.82"></a> -<span class="sourceLineNo">083</span> * initializeTable(connection, tableName);<a name="line.83"></a> -<span class="sourceLineNo">084</span> * byte[][] inputColumns = new byte [][] { Bytes.toBytes("columnA"),<a name="line.84"></a> -<span class="sourceLineNo">085</span> * Bytes.toBytes("columnB") };<a name="line.85"></a> -<span class="sourceLineNo">086</span> * // optional, by default we'll get everything for the table.<a name="line.86"></a> -<span class="sourceLineNo">087</span> * Scan scan = new Scan();<a name="line.87"></a> -<span class="sourceLineNo">088</span> * for (byte[] family : inputColumns) {<a name="line.88"></a> -<span class="sourceLineNo">089</span> * scan.addFamily(family);<a name="line.89"></a> -<span class="sourceLineNo">090</span> * }<a name="line.90"></a> -<span class="sourceLineNo">091</span> * Filter exampleFilter = new RowFilter(CompareOp.EQUAL, new RegexStringComparator("aa.*"));<a name="line.91"></a> -<span class="sourceLineNo">092</span> * scan.setFilter(exampleFilter);<a name="line.92"></a> -<span class="sourceLineNo">093</span> * setScan(scan);<a name="line.93"></a> -<span class="sourceLineNo">094</span> * }<a name="line.94"></a> -<span class="sourceLineNo">095</span> * }<a name="line.95"></a> -<span class="sourceLineNo">096</span> * </pre><a name="line.96"></a> -<span class="sourceLineNo">097</span> */<a name="line.97"></a> -<span class="sourceLineNo">098</span>@InterfaceAudience.Public<a name="line.98"></a> -<span class="sourceLineNo">099</span>public abstract class TableInputFormatBase<a name="line.99"></a> -<span class="sourceLineNo">100</span>extends InputFormat<ImmutableBytesWritable, Result> {<a name="line.100"></a> -<span class="sourceLineNo">101</span><a name="line.101"></a> -<span class="sourceLineNo">102</span> /** Specify if we enable auto-balance for input in M/R jobs.*/<a name="line.102"></a> -<span class="sourceLineNo">103</span> public static final String MAPREDUCE_INPUT_AUTOBALANCE = "hbase.mapreduce.input.autobalance";<a name="line.103"></a> -<span class="sourceLineNo">104</span> /** Specify if ratio for data skew in M/R jobs, it goes well with the enabling hbase.mapreduce<a name="line.104"></a> -<span class="sourceLineNo">105</span> * .input.autobalance property.*/<a name="line.105"></a> -<span class="sourceLineNo">106</span> public static final String INPUT_AUTOBALANCE_MAXSKEWRATIO = "hbase.mapreduce.input.autobalance" +<a name="line.106"></a> -<span class="sourceLineNo">107</span> ".maxskewratio";<a name="line.107"></a> -<span class="sourceLineNo">108</span> /** Specify if the row key in table is text (ASCII between 32~126),<a name="line.108"></a> -<span class="sourceLineNo">109</span> * default is true. False means the table is using binary row key*/<a name="line.109"></a> -<span class="sourceLineNo">110</span> public static final String TABLE_ROW_TEXTKEY = "hbase.table.row.textkey";<a name="line.110"></a> -<span class="sourceLineNo">111</span><a name="line.111"></a> -<span class="sourceLineNo">112</span> private static final Log LOG = LogFactory.getLog(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> /** Holds the details for the internal scanner.<a name="line.121"></a> -<span class="sourceLineNo">122</span> *<a name="line.122"></a> -<span class="sourceLineNo">123</span> * @see Scan */<a name="line.123"></a> -<span class="sourceLineNo">124</span> private Scan scan = null;<a name="line.124"></a> -<span class="sourceLineNo">125</span> /** The {@link Admin}. */<a name="line.125"></a> -<span class="sourceLineNo">126</span> private Admin admin;<a name="line.126"></a> -<span class="sourceLineNo">127</span> /** The {@link Table} to scan. */<a name="line.127"></a> -<span class="sourceLineNo">128</span> private Table table;<a name="line.128"></a> -<span class="sourceLineNo">129</span> /** The {@link RegionLocator} of the table. */<a name="line.129"></a> -<span class="sourceLineNo">130</span> private RegionLocator regionLocator;<a name="line.130"></a> -<span class="sourceLineNo">131</span> /** The reader scanning the table, can be a custom one. */<a name="line.131"></a> -<span class="sourceLineNo">132</span> private TableRecordReader tableRecordReader = null;<a name="line.132"></a> -<span class="sourceLineNo">133</span> /** The underlying {@link Connection} of the table. */<a name="line.133"></a> -<span class="sourceLineNo">134</span> private Connection connection;<a name="line.134"></a> +<span class="sourceLineNo">048</span>import org.apache.hadoop.hbase.util.Strings;<a name="line.48"></a> +<span class="sourceLineNo">049</span>import org.apache.hadoop.mapreduce.InputFormat;<a name="line.49"></a> +<span class="sourceLineNo">050</span>import org.apache.hadoop.mapreduce.InputSplit;<a name="line.50"></a> +<span class="sourceLineNo">051</span>import org.apache.hadoop.mapreduce.JobContext;<a name="line.51"></a> +<span class="sourceLineNo">052</span>import org.apache.hadoop.mapreduce.RecordReader;<a name="line.52"></a> +<span class="sourceLineNo">053</span>import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.53"></a> +<span class="sourceLineNo">054</span>import org.apache.hadoop.net.DNS;<a name="line.54"></a> +<span class="sourceLineNo">055</span>import org.apache.hadoop.util.StringUtils;<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>@InterfaceAudience.Public<a name="line.97"></a> +<span class="sourceLineNo">098</span>public abstract class TableInputFormatBase<a name="line.98"></a> +<span class="sourceLineNo">099</span>extends InputFormat<ImmutableBytesWritable, Result> {<a name="line.99"></a> +<span class="sourceLineNo">100</span><a name="line.100"></a> +<span class="sourceLineNo">101</span> /** Specify if we enable auto-balance for input in M/R jobs.*/<a name="line.101"></a> +<span class="sourceLineNo">102</span> public static final String MAPREDUCE_INPUT_AUTOBALANCE = "hbase.mapreduce.input.autobalance";<a name="line.102"></a> +<span class="sourceLineNo">103</span> /** Specify if ratio for data skew in M/R jobs, it goes well with the enabling hbase.mapreduce<a name="line.103"></a> +<span class="sourceLineNo">104</span> * .input.autobalance property.*/<a name="line.104"></a> +<span class="sourceLineNo">105</span> public static final String INPUT_AUTOBALANCE_MAXSKEWRATIO = "hbase.mapreduce.input.autobalance" +<a name="line.105"></a> +<span class="sourceLineNo">106</span> ".maxskewratio";<a name="line.106"></a> +<span class="sourceLineNo">107</span> /** Specify if the row key in table is text (ASCII between 32~126),<a name="line.107"></a> +<span class="sourceLineNo">108</span> * default is true. False means the table is using binary row key*/<a name="line.108"></a> +<span class="sourceLineNo">109</span> public static final String TABLE_ROW_TEXTKEY = "hbase.table.row.textkey";<a name="line.109"></a> +<span class="sourceLineNo">110</span><a name="line.110"></a> +<span class="sourceLineNo">111</span> private static final Log LOG = LogFactory.getLog(TableInputFormatBase.class);<a name="line.111"></a> +<span class="sourceLineNo">112</span><a name="line.112"></a> +<span class="sourceLineNo">113</span> private static final String NOT_INITIALIZED = "The input format instance has not been properly " +<a name="line.113"></a> +<span class="sourceLineNo">114</span> "initialized. Ensure you call initializeTable either in your constructor or initialize " +<a name="line.114"></a> +<span class="sourceLineNo">115</span> "method";<a name="line.115"></a> +<span class="sourceLineNo">116</span> private static final String INITIALIZATION_ERROR = "Cannot create a record reader because of a" +<a name="line.116"></a> +<span class="sourceLineNo">117</span> " previous error. Please look at the previous logs lines from" +<a name="line.117"></a> +<span class="sourceLineNo">118</span> " the task's full log for more details.";<a name="line.118"></a> +<span class="sourceLineNo">119</span><a name="line.119"></a> +<span class="sourceLineNo">120</span> /** Holds the details for the internal scanner.<a name="line.120"></a> +<span class="sourceLineNo">121</span> *<a name="line.121"></a> +<span class="sourceLineNo">122</span> * @see Scan */<a name="line.122"></a> +<span class="sourceLineNo">123</span> private Scan scan = null;<a name="line.123"></a> +<span class="sourceLineNo">124</span> /** The {@link Admin}. */<a name="line.124"></a> +<span class="sourceLineNo">125</span> private Admin admin;<a name="line.125"></a> +<span class="sourceLineNo">126</span> /** The {@link Table} to scan. */<a name="line.126"></a> +<span class="sourceLineNo">127</span> private Table table;<a name="line.127"></a> +<span class="sourceLineNo">128</span> /** The {@link RegionLocator} of the table. */<a name="line.128"></a> +<span class="sourceLineNo">129</span> private RegionLocator regionLocator;<a name="line.129"></a> +<span class="sourceLineNo">130</span> /** The reader scanning the table, can be a custom one. */<a name="line.130"></a> +<span class="sourceLineNo">131</span> private TableRecordReader tableRecordReader = null;<a name="line.131"></a> +<span class="sourceLineNo">132</span> /** The underlying {@link Connection} of the table. */<a name="line.132"></a> +<span class="sourceLineNo">133</span> private Connection connection;<a name="line.133"></a> +<span class="sourceLineNo">134</span><a name="line.134"></a> <span class="sourceLineNo">135</span><a name="line.135"></a> -<span class="sourceLineNo">136</span> <a name="line.136"></a> -<span class="sourceLineNo">137</span> /** The reverse DNS lookup cache mapping: IPAddress => HostName */<a name="line.137"></a> -<span class="sourceLineNo">138</span> private HashMap<InetAddress, String> reverseDNSCacheMap = new HashMap<>();<a name="line.138"></a> -<span class="sourceLineNo">139</span><a name="line.139"></a> -<span class="sourceLineNo">140</span> /**<a name="line.140"></a> -<span class="sourceLineNo">141</span> * Builds a {@link TableRecordReader}. If no {@link TableRecordReader} was provided, uses<a name="line.141"></a> -<span class="sourceLineNo">142</span> * the default.<a name="line.142"></a> -<span class="sourceLineNo">143</span> *<a name="line.143"></a> -<span class="sourceLineNo">144</span> * @param split The split to work with.<a name="line.144"></a> -<span class="sourceLineNo">145</span> * @param context The current context.<a name="line.145"></a> -<span class="sourceLineNo">146</span> * @return The newly created record reader.<a name="line.146"></a> -<span class="sourceLineNo">147</span> * @throws IOException When creating the reader fails.<a name="line.147"></a> -<span class="sourceLineNo">148</span> * @see org.apache.hadoop.mapreduce.InputFormat#createRecordReader(<a name="line.148"></a> -<span class="sourceLineNo">149</span> * org.apache.hadoop.mapreduce.InputSplit,<a name="line.149"></a> -<span class="sourceLineNo">150</span> * org.apache.hadoop.mapreduce.TaskAttemptContext)<a name="line.150"></a> -<span class="sourceLineNo">151</span> */<a name="line.151"></a> -<span class="sourceLineNo">152</span> @Override<a name="line.152"></a> -<span class="sourceLineNo">153</span> public RecordReader<ImmutableBytesWritable, Result> createRecordReader(<a name="line.153"></a> -<span class="sourceLineNo">154</span> InputSplit split, TaskAttemptContext context)<a name="line.154"></a> -<span class="sourceLineNo">155</span> throws IOException {<a name="line.155"></a> -<span class="sourceLineNo">156</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.156"></a> -<span class="sourceLineNo">157</span> if (table == null) {<a name="line.157"></a> -<span class="sourceLineNo">158</span> initialize(context);<a name="line.158"></a> -<span class="sourceLineNo">159</span> }<a name="line.159"></a> -<span class="sourceLineNo">160</span> // null check in case our child overrides getTable to not throw.<a name="line.160"></a> -<span class="sourceLineNo">161</span> try {<a name="line.161"></a> -<span class="sourceLineNo">162</span> if (getTable() == null) {<a name="line.162"></a> -<span class="sourceLineNo">163</span> // initialize() must not have been implemented in the subclass.<a name="line.163"></a> -<span class="sourceLineNo">164</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.164"></a> -<span class="sourceLineNo">165</span> }<a name="line.165"></a> -<span class="sourceLineNo">166</span> } catch (IllegalStateException exception) {<a name="line.166"></a> -<span class="sourceLineNo">167</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.167"></a> -<span class="sourceLineNo">168</span> }<a name="line.168"></a> -<span class="sourceLineNo">169</span> TableSplit tSplit = (TableSplit) split;<a name="line.169"></a> -<span class="sourceLineNo">170</span> LOG.info("Input split length: " + StringUtils.humanReadableInt(tSplit.getLength()) + " bytes.");<a name="line.170"></a> -<span class="sourceLineNo">171</span> final TableRecordReader trr =<a name="line.171"></a> -<span class="sourceLineNo">172</span> this.tableRecordReader != null ? 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The<a name="line.219"></a> -<span class="sourceLineNo">220</span> * number of splits matches the number of regions in a table.<a name="line.220"></a> -<span class="sourceLineNo">221</span> *<a name="line.221"></a> -<span class="sourceLineNo">222</span> * @param context The current job context.<a name="line.222"></a> -<span class="sourceLineNo">223</span> * @return The list of input splits.<a name="line.223"></a> -<span class="sourceLineNo">224</span> * @throws IOException When creating the list of splits fails.<a name="line.224"></a> -<span class="sourceLineNo">225</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits(<a name="line.225"></a> -<span class="sourceLineNo">226</span> * org.apache.hadoop.mapreduce.JobContext)<a name="line.226"></a> -<span class="sourceLineNo">227</span> */<a name="line.227"></a> -<span class="sourceLineNo">228</span> @Override<a name="line.228"></a> -<span class="sourceLineNo">229</span> public List<InputSplit> getSplits(JobContext context) throws IOException {<a name="line.229"></a> -<span class="sourceLineNo">230</span> boolean closeOnFinish = false;<a name="line.230"></a> -<span class="sourceLineNo">231</span><a name="line.231"></a> -<span class="sourceLineNo">232</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.232"></a> -<span class="sourceLineNo">233</span> if (table == null) {<a name="line.233"></a> -<span class="sourceLineNo">234</span> initialize(context);<a name="line.234"></a> -<span class="sourceLineNo">235</span> closeOnFinish = true;<a name="line.235"></a> -<span class="sourceLineNo">236</span> }<a name="line.236"></a> -<span class="sourceLineNo">237</span><a name="line.237"></a> -<span class="sourceLineNo">238</span> // null check in case our child overrides getTable to not throw.<a name="line.238"></a> -<span class="sourceLineNo">239</span> try {<a name="line.239"></a> -<span class="sourceLineNo">240</span> if (getTable() == null) {<a name="line.240"></a> -<span class="sourceLineNo">241</span> // initialize() must not have been implemented in the subclass.<a name="line.241"></a> -<span class="sourceLineNo">242</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.242"></a> -<span class="sourceLineNo">243</span> }<a name="line.243"></a> -<span class="sourceLineNo">244</span> } catch (IllegalStateException exception) {<a name="line.244"></a> -<span class="sourceLineNo">245</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.245"></a> -<span class="sourceLineNo">246</span> }<a name="line.246"></a> -<span class="sourceLineNo">247</span><a name="line.247"></a> -<span class="sourceLineNo">248</span> try {<a name="line.248"></a> -<span class="sourceLineNo">249</span> RegionSizeCalculator sizeCalculator =<a name="line.249"></a> -<span class="sourceLineNo">250</span> new RegionSizeCalculator(getRegionLocator(), getAdmin());<a name="line.250"></a> -<span class="sourceLineNo">251</span> <a name="line.251"></a> -<span class="sourceLineNo">252</span> TableName tableName = getTable().getName();<a name="line.252"></a> -<span class="sourceLineNo">253</span> <a name="line.253"></a> -<span class="sourceLineNo">254</span> Pair<byte[][], byte[][]> keys = getStartEndKeys();<a name="line.254"></a> -<span class="sourceLineNo">255</span> if (keys == null || keys.getFirst() == null ||<a name="line.255"></a> -<span class="sourceLineNo">256</span> keys.getFirst().length == 0) {<a name="line.256"></a> -<span class="sourceLineNo">257</span> HRegionLocation regLoc =<a name="line.257"></a> -<span class="sourceLineNo">258</span> getRegionLocator().getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);<a name="line.258"></a> -<span class="sourceLineNo">259</span> if (null == regLoc) {<a name="line.259"></a> -<span class="sourceLineNo">260</span> throw new IOException("Expecting at least one region.");<a name="line.260"></a> -<span class="sourceLineNo">261</span> }<a name="line.261"></a> -<span class="sourceLineNo">262</span> List<InputSplit> splits = new ArrayList<>(1);<a name="line.262"></a> -<span class="sourceLineNo">263</span> long regionSize = sizeCalculator.getRegionSize(regLoc.getRegionInfo().getRegionName());<a name="line.263"></a> -<span class="sourceLineNo">264</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.264"></a> -<span class="sourceLineNo">265</span> HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY, regLoc<a name="line.265"></a> -<span class="sourceLineNo">266</span> .getHostnamePort().split(Addressing.HOSTNAME_PORT_SEPARATOR)[0], regionSize);<a name="line.266"></a> -<span class="sourceLineNo">267</span> splits.add(split);<a name="line.267"></a> -<span class="sourceLineNo">268</span> return splits;<a name="line.268"></a> -<span class="sourceLineNo">269</span> }<a name="line.269"></a> -<span class="sourceLineNo">270</span> List<InputSplit> splits = new ArrayList<>(keys.getFirst().length);<a name="line.270"></a> -<span class="sourceLineNo">271</span> for (int i = 0; i < keys.getFirst().length; i++) {<a name="line.271"></a> -<span class="sourceLineNo">272</span> if (!includeRegionInSplit(keys.getFirst()[i], keys.getSecond()[i])) {<a name="line.272"></a> -<span class="sourceLineNo">273</span> continue;<a name="line.273"></a> -<span class="sourceLineNo">274</span> }<a name="line.274"></a> -<span class="sourceLineNo">275</span><a name="line.275"></a> -<span class="sourceLineNo">276</span> byte[] startRow = scan.getStartRow();<a name="line.276"></a> -<span class="sourceLineNo">277</span> byte[] stopRow = scan.getStopRow();<a name="line.277"></a> -<span class="sourceLineNo">278</span> // determine if the given start an stop key fall into the region<a name="line.278"></a> -<span class="sourceLineNo">279</span> if ((startRow.length == 0 || keys.getSecond()[i].length == 0 ||<a name="line.279"></a> -<span class="sourceLineNo">280</span> Bytes.compareTo(startRow, keys.getSecond()[i]) < 0) &&<a name="line.280"></a> -<span class="sourceLineNo">281</span> (stopRow.length == 0 ||<a name="line.281"></a> -<span class="sourceLineNo">282</span> Bytes.compareTo(stopRow, keys.getFirst()[i]) > 0)) {<a name="line.282"></a> -<span class="sourceLineNo">283</span> byte[] splitStart = startRow.length == 0 ||<a name="line.283"></a> -<span class="sourceLineNo">284</span> Bytes.compareTo(keys.getFirst()[i], startRow) >= 0 ?<a name="line.284"></a> -<span class="sourceLineNo">285</span> keys.getFirst()[i] : startRow;<a name="line.285"></a> -<span class="sourceLineNo">286</span> byte[] splitStop = (stopRow.length == 0 ||<a name="line.286"></a> -<span class="sourceLineNo">287</span> Bytes.compareTo(keys.getSecond()[i], stopRow) <= 0) &&<a name="line.287"></a> -<span class="sourceLineNo">288</span> keys.getSecond()[i].length > 0 ?<a name="line.288"></a> -<span class="sourceLineNo">289</span> keys.getSecond()[i] : stopRow;<a name="line.289"></a> -<span class="sourceLineNo">290</span><a name="line.290"></a> -<span class="sourceLineNo">291</span> HRegionLocation location = getRegionLocator().getRegionLocation(keys.getFirst()[i], false);<a name="line.291"></a> -<span class="sourceLineNo">292</span> // The below InetSocketAddress creation does a name resolution.<a name="line.292"></a> -<span class="sourceLineNo">293</span> InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());<a name="line.293"></a> -<span class="sourceLineNo">294</span> if (isa.isUnresolved()) {<a name="line.294"></a> -<span class="sourceLineNo">295</span> LOG.warn("Failed resolve " + isa);<a name="line.295"></a> -<span class="sourceLineNo">296</span> }<a name="line.296"></a> -<span class="sourceLineNo">297</span> InetAddress regionAddress = isa.getAddress();<a name="line.297"></a> -<span class="sourceLineNo">298</span> String regionLocation;<a name="line.298"></a> -<span class="sourceLineNo">299</span> regionLocation = reverseDNS(regionAddress);<a name="line.299"></a> -<span class="sourceLineNo">300</span><a name="line.300"></a> -<span class="sourceLineNo">301</span> byte[] regionName = location.getRegionInfo().getRegionName();<a name="line.301"></a> -<span class="sourceLineNo">302</span> String encodedRegionName = location.getRegionInfo().getEncodedName();<a name="line.302"></a> -<span class="sourceLineNo">303</span> long regionSize = sizeCalculator.getRegionSize(regionName);<a name="line.303"></a> -<span class="sourceLineNo">304</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.304"></a> -<span class="sourceLineNo">305</span> splitStart, splitStop, regionLocation, encodedRegionName, regionSize);<a name="line.305"></a> -<span class="sourceLineNo">306</span> splits.add(split);<a name="line.306"></a> -<span class="sourceLineNo">307</span> if (LOG.isDebugEnabled()) {<a name="line.307"></a> -<span class="sourceLineNo">308</span> LOG.debug("getSplits: split -> " + i + " -> " + split);<a name="line.308"></a> -<span class="sourceLineNo">309</span> }<a name="line.309"></a> -<span class="sourceLineNo">310</span> }<a name="line.310"></a> -<span class="sourceLineNo">311</span> }<a name="line.311"></a> -<span class="sourceLineNo">312</span> //The default value of "hbase.mapreduce.input.autobalance" is false, which means not enabled.<a name="line.312"></a> -<span class="sourceLineNo">313</span> boolean enableAutoBalance = context.getConfiguration()<a name="line.313"></a> -<span class="sourceLineNo">314</span> .getBoolean(MAPREDUCE_INPUT_AUTOBALANCE, false);<a name="line.314"></a> -<span class="sourceLineNo">315</span> if (enableAutoBalance) {<a name="line.315"></a> -<span class="sourceLineNo">316</span> long totalRegionSize=0;<a name="line.316"></a> -<span class="sourceLineNo">317</span> for (int i = 0; i < splits.size(); i++){<a name="line.317"></a> -<span class="sourceLineNo">318</span> TableSplit ts = (TableSplit)splits.get(i);<a name="line.318"></a> -<span class="sourceLineNo">319</span> totalRegionSize += ts.getLength();<a name="line.319"></a> -<span class="sourceLineNo">320</span> }<a name="line.320"></a> -<span class="sourceLineNo">321</span> long averageRegionSize = totalRegionSize / splits.size();<a name="line.321"></a> -<span class="sourceLineNo">322</span> // the averageRegionSize must be positive.<a name="line.322"></a> -<span class="sourceLineNo">323</span> if (averageRegionSize <= 0) {<a name="line.323"></a> -<span class="sourceLineNo">324</span> LOG.warn("The averageRegionSize is not positive: "+ averageRegionSize + ", " +<a name="line.324"></a> -<span class="sourceLineNo">325</span> "set it to 1.");<a name="line.325"></a> -<span class="sourceLineNo">326</span> averageRegionSize = 1;<a name="line.326"></a> -<span class="sourceLineNo">327</span> }<a name="line.327"></a> -<span class="sourceLineNo">328</span> return calculateRebalancedSplits(splits, context, averageRegionSize);<a name="line.328"></a> -<span class="sourceLineNo">329</span> } else {<a name="line.329"></a> -<span class="sourceLineNo">330</span> return splits;<a name="line.330"></a> -<span class="sourceLineNo">331</span> }<a name="line.331"></a> -<span class="sourceLineNo">332</span> } finally {<a name="line.332"></a> -<span class="sourceLineNo">333</span> if (closeOnFinish) {<a name="line.333"></a> -<span class="sourceLineNo">334</span> closeTable();<a name="line.334"></a> -<span class="sourceLineNo">335</span> }<a name="line.335"></a> -<span class="sourceLineNo">336</span> }<a name="line.336"></a> -<span class="sourceLineNo">337</span> }<a name="line.337"></a> -<span class="sourceLineNo">338</span><a name="line.338"></a> -<span class="sourceLineNo">339</span> String reverseDNS(InetAddress ipAddress) throws UnknownHostException {<a name="line.339"></a> -<span class="sourceLineNo">340</span> String hostName = this.reverseDNSCacheMap.get(ipAddress);<a name="line.340"></a> -<span class="sourceLineNo">341</span> if (hostName == null) {<a name="line.341"></a> -<span class="sourceLineNo">342</span> String ipAddressString = null;<a name="line.342"></a> -<span class="sourceLineNo">343</span> try {<a name="line.343"></a> -<span class="sourceLineNo">344</span> ipAddressString = DNS.reverseDns(ipAddress, null);<a name="line.344"></a> -<span class="sourceLineNo">345</span> } catch (Exception e) {<a name="line.345"></a> -<span class="sourceLineNo">346</span> // We can use InetAddress in case the jndi failed to pull up the reverse DNS entry from the<a name="line.346"></a> -<span class="sourceLineNo">347</span> // name service. 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In addition to reducing InputSplits, reduces the load on the region server as well, due to the ordering of the keys.<a name="line.521"></a> +<span class="sourceLineNo">136</span> /** The reverse DNS lookup cache mapping: IPAddress => HostName */<a name="line.136"></a> +<span class="sourceLineNo">137</span> private HashMap<InetAddress, String> reverseDNSCacheMap = new HashMap<>();<a name="line.137"></a> +<span class="sourceLineNo">138</span><a name="line.138"></a> +<span class="sourceLineNo">139</span> /**<a name="line.139"></a> +<span class="sourceLineNo">140</span> * Builds a {@link TableRecordReader}. If no {@link TableRecordReader} was provided, uses<a name="line.140"></a> +<span class="sourceLineNo">141</span> * the default.<a name="line.141"></a> +<span class="sourceLineNo">142</span> *<a name="line.142"></a> +<span class="sourceLineNo">143</span> * @param split The split to work with.<a name="line.143"></a> +<span class="sourceLineNo">144</span> * @param context The current context.<a name="line.144"></a> +<span class="sourceLineNo">145</span> * @return The newly created record reader.<a name="line.145"></a> +<span class="sourceLineNo">146</span> * @throws IOException When creating the reader fails.<a name="line.146"></a> +<span class="sourceLineNo">147</span> * @see org.apache.hadoop.mapreduce.InputFormat#createRecordReader(<a name="line.147"></a> +<span class="sourceLineNo">148</span> * org.apache.hadoop.mapreduce.InputSplit,<a name="line.148"></a> +<span class="sourceLineNo">149</span> * org.apache.hadoop.mapreduce.TaskAttemptContext)<a name="line.149"></a> +<span class="sourceLineNo">150</span> */<a name="line.150"></a> +<span class="sourceLineNo">151</span> @Override<a name="line.151"></a> +<span class="sourceLineNo">152</span> public RecordReader<ImmutableBytesWritable, Result> createRecordReader(<a name="line.152"></a> +<span class="sourceLineNo">153</span> InputSplit split, TaskAttemptContext context)<a name="line.153"></a> +<span class="sourceLineNo">154</span> throws IOException {<a name="line.154"></a> +<span class="sourceLineNo">155</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.155"></a> +<span class="sourceLineNo">156</span> if (table == null) {<a name="line.156"></a> +<span class="sourceLineNo">157</span> initialize(context);<a name="line.157"></a> +<span class="sourceLineNo">158</span> }<a name="line.158"></a> +<span class="sourceLineNo">159</span> // null check in case our child overrides getTable to not throw.<a name="line.159"></a> +<span class="sourceLineNo">160</span> try {<a name="line.160"></a> +<span class="sourceLineNo">161</span> if (getTable() == null) {<a name="line.161"></a> +<span class="sourceLineNo">162</span> // initialize() must not have been implemented in the subclass.<a name="line.162"></a> +<span class="sourceLineNo">163</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.163"></a> +<span class="sourceLineNo">164</span> }<a name="line.164"></a> +<span class="sourceLineNo">165</span> } catch (IllegalStateException exception) {<a name="line.165"></a> +<span class="sourceLineNo">166</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.166"></a> +<span class="sourceLineNo">167</span> }<a name="line.167"></a> +<span class="sourceLineNo">168</span> TableSplit tSplit = (TableSplit) split;<a name="line.168"></a> +<span class="sourceLineNo">169</span> LOG.info("Input split length: " + StringUtils.humanReadableInt(tSplit.getLength()) + " bytes.");<a name="line.169"></a> +<span class="sourceLineNo">170</span> final TableRecordReader trr =<a name="line.170"></a> +<span class="sourceLineNo">171</span> this.tableRecordReader != null ? this.tableRecordReader : new TableRecordReader();<a name="line.171"></a> +<span class="sourceLineNo">172</span> Scan sc = new Scan(this.scan);<a name="line.172"></a> +<span class="sourceLineNo">173</span> sc.setStartRow(tSplit.getStartRow());<a name="line.173"></a> +<span class="sourceLineNo">174</span> sc.setStopRow(tSplit.getEndRow());<a name="line.174"></a> +<span class="sourceLineNo">175</span> trr.setScan(sc);<a name="line.175"></a> +<span class="sourceLineNo">176</span> trr.setTable(getTable());<a name="line.176"></a> +<span class="sourceLineNo">177</span> return new RecordReader<ImmutableBytesWritable, Result>() {<a name="line.177"></a> +<span class="sourceLineNo">178</span><a name="line.178"></a> +<span class="sourceLineNo">179</span> @Override<a name="line.179"></a> +<span class="sourceLineNo">180</span> public void close() throws IOException {<a name="line.180"></a> +<span class="sourceLineNo">181</span> trr.close();<a name="line.181"></a> +<span class="sourceLineNo">182</span> closeTable();<a name="line.182"></a> +<span class="sourceLineNo">183</span> }<a name="line.183"></a> +<span class="sourceLineNo">184</span><a name="line.184"></a> +<span class="sourceLineNo">185</span> @Override<a name="line.185"></a> +<span class="sourceLineNo">186</span> public ImmutableBytesWritable getCurrentKey() throws IOException, InterruptedException {<a name="line.186"></a> +<span class="sourceLineNo">187</span> return trr.getCurrentKey();<a name="line.187"></a> +<span class="sourceLineNo">188</span> }<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 Result getCurrentValue() throws IOException, InterruptedException {<a name="line.191"></a> +<span class="sourceLineNo">192</span> return trr.getCurrentValue();<a name="line.192"></a> +<span class="sourceLineNo">193</span> }<a name="line.193"></a> +<span class="sourceLineNo">194</span><a name="line.194"></a> +<span class="sourceLineNo">195</span> @Override<a name="line.195"></a> +<span class="sourceLineNo">196</span> public float getProgress() throws IOException, InterruptedException {<a name="line.196"></a> +<span class="sourceLineNo">197</span> return trr.getProgress();<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> @Override<a name="line.200"></a> +<span class="sourceLineNo">201</span> public void initialize(InputSplit inputsplit, TaskAttemptContext context) throws IOException,<a name="line.201"></a> +<span class="sourceLineNo">202</span> InterruptedException {<a name="line.202"></a> +<span class="sourceLineNo">203</span> trr.initialize(inputsplit, context);<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 boolean nextKeyValue() throws IOException, InterruptedException {<a name="line.207"></a> +<span class="sourceLineNo">208</span> return trr.nextKeyValue();<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> }<a name="line.211"></a> +<span class="sourceLineNo">212</span><a name="line.212"></a> +<span class="sourceLineNo">213</span> protected Pair<byte[][],byte[][]> getStartEndKeys() throws IOException {<a name="line.213"></a> +<span class="sourceLineNo">214</span> return getRegionLocator().getStartEndKeys();<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> * Calculates the splits that will serve as input for the map tasks. The<a name="line.218"></a> +<span class="sourceLineNo">219</span> * number of splits matches the number of regions in a table.<a name="line.219"></a> +<span class="sourceLineNo">220</span> *<a name="line.220"></a> +<span class="sourceLineNo">221</span> * @param context The current job context.<a name="line.221"></a> +<span class="sourceLineNo">222</span> * @return The list of input splits.<a name="line.222"></a> +<span class="sourceLineNo">223</span> * @throws IOException When creating the list of splits fails.<a name="line.223"></a> +<span class="sourceLineNo">224</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits(<a name="line.224"></a> +<span class="sourceLineNo">225</span> * org.apache.hadoop.mapreduce.JobContext)<a name="line.225"></a> +<span class="sourceLineNo">226</span> */<a name="line.226"></a> +<span class="sourceLineNo">227</span> @Override<a name="line.227"></a> +<span class="sourceLineNo">228</span> public List<InputSplit> getSplits(JobContext context) throws IOException {<a name="line.228"></a> +<span class="sourceLineNo">229</span> boolean closeOnFinish = false;<a name="line.229"></a> +<span class="sourceLineNo">230</span><a name="line.230"></a> +<span class="sourceLineNo">231</span> // Just in case a subclass is relying on JobConfigurable magic.<a name="line.231"></a> +<span class="sourceLineNo">232</span> if (table == null) {<a name="line.232"></a> +<span class="sourceLineNo">233</span> initialize(context);<a name="line.233"></a> +<span class="sourceLineNo">234</span> closeOnFinish = true;<a name="line.234"></a> +<span class="sourceLineNo">235</span> }<a name="line.235"></a> +<span class="sourceLineNo">236</span><a name="line.236"></a> +<span class="sourceLineNo">237</span> // null check in case our child overrides getTable to not throw.<a name="line.237"></a> +<span class="sourceLineNo">238</span> try {<a name="line.238"></a> +<span class="sourceLineNo">239</span> if (getTable() == null) {<a name="line.239"></a> +<span class="sourceLineNo">240</span> // initialize() must not have been implemented in the subclass.<a name="line.240"></a> +<span class="sourceLineNo">241</span> throw new IOException(INITIALIZATION_ERROR);<a name="line.241"></a> +<span class="sourceLineNo">242</span> }<a name="line.242"></a> +<span class="sourceLineNo">243</span> } catch (IllegalStateException exception) {<a name="line.243"></a> +<span class="sourceLineNo">244</span> throw new IOException(INITIALIZATION_ERROR, exception);<a name="line.244"></a> +<span class="sourceLineNo">245</span> }<a name="line.245"></a> +<span class="sourceLineNo">246</span><a name="line.246"></a> +<span class="sourceLineNo">247</span> try {<a name="line.247"></a> +<span class="sourceLineNo">248</span> RegionSizeCalculator sizeCalculator =<a name="line.248"></a> +<span class="sourceLineNo">249</span> new RegionSizeCalculator(getRegionLocator(), getAdmin());<a name="line.249"></a> +<span class="sourceLineNo">250</span><a name="line.250"></a> +<span class="sourceLineNo">251</span> TableName tableName = getTable().getName();<a name="line.251"></a> +<span class="sourceLineNo">252</span><a name="line.252"></a> +<span class="sourceLineNo">253</span> Pair<byte[][], byte[][]> keys = getStartEndKeys();<a name="line.253"></a> +<span class="sourceLineNo">254</span> if (keys == null || keys.getFirst() == null ||<a name="line.254"></a> +<span class="sourceLineNo">255</span> keys.getFirst().length == 0) {<a name="line.255"></a> +<span class="sourceLineNo">256</span> HRegionLocation regLoc =<a name="line.256"></a> +<span class="sourceLineNo">257</span> getRegionLocator().getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);<a name="line.257"></a> +<span class="sourceLineNo">258</span> if (null == regLoc) {<a name="line.258"></a> +<span class="sourceLineNo">259</span> throw new IOException("Expecting at least one region.");<a name="line.259"></a> +<span class="sourceLineNo">260</span> }<a name="line.260"></a> +<span class="sourceLineNo">261</span> List<InputSplit> splits = new ArrayList<>(1);<a name="line.261"></a> +<span class="sourceLineNo">262</span> long regionSize = sizeCalculator.getRegionSize(regLoc.getRegionInfo().getRegionName());<a name="line.262"></a> +<span class="sourceLineNo">263</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.263"></a> +<span class="sourceLineNo">264</span> HConstants.EMPTY_BYTE_ARRAY, HConstants.EMPTY_BYTE_ARRAY, regLoc<a name="line.264"></a> +<span class="sourceLineNo">265</span> .getHostnamePort().split(Addressing.HOSTNAME_PORT_SEPARATOR)[0], regionSize);<a name="line.265"></a> +<span class="sourceLineNo">266</span> splits.add(split);<a name="line.266"></a> +<span class="sourceLineNo">267</span> return splits;<a name="line.267"></a> +<span class="sourceLineNo">268</span> }<a name="line.268"></a> +<span class="sourceLineNo">269</span> List<InputSplit> splits = new ArrayList<>(keys.getFirst().length);<a name="line.269"></a> +<span class="sourceLineNo">270</span> for (int i = 0; i < keys.getFirst().length; i++) {<a name="line.270"></a> +<span class="sourceLineNo">271</span> if (!includeRegionInSplit(keys.getFirst()[i], keys.getSecond()[i])) {<a name="line.271"></a> +<span class="sourceLineNo">272</span> continue;<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> byte[] startRow = scan.getStartRow();<a name="line.275"></a> +<span class="sourceLineNo">276</span> byte[] stopRow = scan.getStopRow();<a name="line.276"></a> +<span class="sourceLineNo">277</span> // determine if the given start an stop key fall into the region<a name="line.277"></a> +<span class="sourceLineNo">278</span> if ((startRow.length == 0 || keys.getSecond()[i].length == 0 ||<a name="line.278"></a> +<span class="sourceLineNo">279</span> Bytes.compareTo(startRow, keys.getSecond()[i]) < 0) &&<a name="line.279"></a> +<span class="sourceLineNo">280</span> (stopRow.length == 0 ||<a name="line.280"></a> +<span class="sourceLineNo">281</span> Bytes.compareTo(stopRow, keys.getFirst()[i]) > 0)) {<a name="line.281"></a> +<span class="sourceLineNo">282</span> byte[] splitStart = startRow.length == 0 ||<a name="line.282"></a> +<span class="sourceLineNo">283</span> Bytes.compareTo(keys.getFirst()[i], startRow) >= 0 ?<a name="line.283"></a> +<span class="sourceLineNo">284</span> keys.getFirst()[i] : startRow;<a name="line.284"></a> +<span class="sourceLineNo">285</span> byte[] splitStop = (stopRow.length == 0 ||<a name="line.285"></a> +<span class="sourceLineNo">286</span> Bytes.compareTo(keys.getSecond()[i], stopRow) <= 0) &&<a name="line.286"></a> +<span class="sourceLineNo">287</span> keys.getSecond()[i].length > 0 ?<a name="line.287"></a> +<span class="sourceLineNo">288</span> keys.getSecond()[i] : stopRow;<a name="line.288"></a> +<span class="sourceLineNo">289</span><a name="line.289"></a> +<span class="sourceLineNo">290</span> HRegionLocation location = getRegionLocator().getRegionLocation(keys.getFirst()[i], false);<a name="line.290"></a> +<span class="sourceLineNo">291</span> // The below InetSocketAddress creation does a name resolution.<a name="line.291"></a> +<span class="sourceLineNo">292</span> InetSocketAddress isa = new InetSocketAddress(location.getHostname(), location.getPort());<a name="line.292"></a> +<span class="sourceLineNo">293</span> if (isa.isUnresolved()) {<a name="line.293"></a> +<span class="sourceLineNo">294</span> LOG.warn("Failed resolve " + isa);<a name="line.294"></a> +<span class="sourceLineNo">295</span> }<a name="line.295"></a> +<span class="sourceLineNo">296</span> InetAddress regionAddress = isa.getAddress();<a name="line.296"></a> +<span class="sourceLineNo">297</span> String regionLocation;<a name="line.297"></a> +<span class="sourceLineNo">298</span> regionLocation = reverseDNS(regionAddress);<a name="line.298"></a> +<span class="sourceLineNo">299</span><a name="line.299"></a> +<span class="sourceLineNo">300</span> byte[] regionName = location.getRegionInfo().getRegionName();<a name="line.300"></a> +<span class="sourceLineNo">301</span> String encodedRegionName = location.getRegionInfo().getEncodedName();<a name="line.301"></a> +<span class="sourceLineNo">302</span> long regionSize = sizeCalculator.getRegionSize(regionName);<a name="line.302"></a> +<span class="sourceLineNo">303</span> TableSplit split = new TableSplit(tableName, scan,<a name="line.303"></a> +<span class="sourceLineNo">304</span> splitStart, splitStop, regionLocation, encodedRegionName, regionSize);<a name="line.304"></a> +<span class="sourceLineNo">305</span> splits.add(split);<a name="line.305"></a> +<span class="sourceLineNo">306</span> if (LOG.isDebugEnabled()) {<a name="line.306"></a> +<span class="sourceLineNo">307</span> LOG.debug("getSplits: split -> " + i + " -> " + split);<a name="line.307"></a> +<span class="sourceLineNo">308</span> }<a name="line.308"></a> +<span class="sourceLineNo">309</span> }<a name="line.309"></a> +<span class="sourceLineNo">310</span> }<a name="line.310"></a> +<span class="sourceLineNo">311</span> //The default value of "hbase.mapreduce.input.autobalance" is false, which means not enabled.<a name="line.311"></a> +<span class="sourceLineNo">312</span> boolean enableAutoBalance = context.getConfiguration()<a name="line.312"></a> +<span class="sourceLineNo">313</span> .getBoolean(MAPREDUCE_INPUT_AUTOBALANCE, false);<a name="line.313"></a> +<span class="sourceLineNo">314</span> if (enableAutoBalance) {<a name="line.314"></a> +<span class="sourceLineNo">315</span> long totalRegionSize=0;<a name="line.315"></a> +<span class="sourceLineNo">316</span> for (int i = 0; i < splits.size(); i++){<a name="line.316"></a> +<span class="sourceLineNo">317</span> TableSplit ts = (TableSplit)splits.get(i);<a name="line.317"></a> +<span class="sourceLineNo">318</span> totalRegionSize += ts.getLength();<a name="line.318"></a> +<span class="sourceLineNo">319</span> }<a name="line.319"></a> +<span class="sourceLineNo">320</span> long averageRegionSize = totalRegionSize / splits.size();<a name="line.320"></a> +<span class="sourceLineNo">321</span> // the averageRegionSize must be positive.<a name="line.321"></a> +<span class="sourceLineNo">322</span> if (averageRegionSize <= 0) {<a name="line.322"></a> +<span class="sourceLineNo">323</span> LOG.warn("The averageRegionSize is not positive: "+ averageRegionSize + ", " +<a name="line.323"></a> +<span class="sourceLineNo">324</span> "set it to 1.");<a name="line.324"></a> +<span class="sourceLineNo">325</span> averageRegionSize = 1;<a name="line.325"></a> +<span class="sourceLineNo">326</span> }<a name="line.326"></a> +<span class="sourceLineNo">327</span> return calculateRebalancedSplits(splits, context, averageRegionSize);<a name="line.327"></a> +<span class="sourceLineNo">328</span> } else {<a name="line.328"></a> +<span class="sourceLineNo">329</span> return splits;<a name="line.329"></a> +<span class="sourceLineNo">330</span> }<a name="line.330"></a> +<span class="sourceLineNo">331</span> } finally {<a name="line.331"></a> +<span class="sourceLineNo">332</span> if (closeOnFinish) {<a name="line.332"></a> +<span class="sourceLineNo">333</span> closeTable();<a name="line.333"></a> +<span class="sourceLineNo">334</span> }<a name="line.334"></a> +<span class="sourceLineNo">335</span> }<a name="line.335"></a> +<span class="sourceLineNo">336</span> }<a name="line.336"></a> +<span class="sourceLineNo">337</span><a name="line.337"></a> +<span class="sourceLineNo">338</span> String reverseDNS(InetAddress ipAddress) throws UnknownHostException {<a name="line.338"></a> +<span class="sourceLineNo">339</span> String hostName = this.reverseDNSCacheMap.get(ipAddress);<a name="line.339"></a> +<span class="sourceLineNo">340</span> if (hostName == null) {<a name="line.340"></a> +<span class="sourceLineNo">341</span> String ipAddressString = null;<a name="line.341"></a> +<span class="sourceLineNo">342</span> try {<a name="line.342"></a> +<span class="sourceLineNo">343</span> ipAddressString = DNS.reverseDns(ipAddress, null);<a name="line.343"></a> +<span class="sourceLineNo">344</span> } catch (Exception e) {<a name="line.344"></a> +<span class="sourceLineNo">345</span> // We can use InetAddress in case the jndi failed to pull up the reverse DNS entry from the<a name="line.345"></a> +<span class="sourceLineNo">346</span> // name service. Also, in case of ipv6, we need to use the InetAddress since resolving<a name="line.346"></a> +<span class="sourceLineNo">347</span> // reverse DNS using jndi doesn't work well with ipv6 addresses.<a name="line.347"></a> +<span class="sourceLineNo">348</span> ipAddressString = InetAddress.getByName(ipAddress.getHostAddress()).getHostName();<a name="line.348"></a> +<span class="sourceLineNo">349</span> }<a name="line.349"></a> +<span class="sourceLineNo">350</span> if (ipAddressString == null) throw new UnknownHostException("No host found for " + ipAddress);<a name="line.350"></a> +<span class="sourceLineNo">351</span> hostName = Strings.domainNamePointerToHostName(ipAddressString);<a name="line.351"></a> +<span class="sourceLineNo">352</span> this.reverseDNSCacheMap.put(ipAddress, hostName);<a name="line.352"></a> +<span class="sourceLineNo">353</span> }<a name="line.353"></a> +<span class="sourceLineNo">354</span> return hostName;<a name="line.354"></a> +<span class="sourceLineNo">355</span> }<a name="line.355"></a> +<span class="sourceLineNo">356</span><a name="line.356"></a> +<span class="sourceLineNo">357</span> /**<a name="line.357"></a> +<span class="sourceLineNo">358</span> * Calculates the number of MapReduce input splits for the map tasks. The number of<a name="line.358"></a> +<span class="sourceLineNo">359</span> * MapReduce input splits depends on the average region size and the "data skew ratio" user set in<a name="line.359"></a> +<span class="sourceLineNo">360</span> * configuration.<a name="line.360"></a> +<span class="sourceLineNo">361</span> *<a name="line.361"></a> +<span class="sourceLineNo">362</span> * @param list The list of input splits before balance.<a name="line.362"></a> +<span class="sourceLineNo">363</span> * @param context The current job context.<a name="line.363"></a> +<span class="sourceLineNo">364</span> * @param average The average size of all regions .<a name="line.364"></a> +<span class="sourceLineNo">365</span> * @return The list of input splits.<a name="line.365"></a> +<span class="sourceLineNo">366</span> * @throws IOException When creating the list of splits fails.<a name="line.366"></a> +<span class="sourceLineNo">367</span> * @see org.apache.hadoop.mapreduce.InputFormat#getSplits(<a name="line.367"></a> +<span class="sourceLineNo">368</span> * org.apache.hadoop.mapreduce.JobContext)<a name="line.368"></a> +<span class="sourceLineNo">369</span> */<a name="line.369"></a> +<span class="sourceLineNo">370</span> private List<InputSplit> calculateRebalancedSplits(List<InputSplit> list, JobContext context,<a name="line.370"></a> +<span class="sourceLineNo">371</span> long average) throws IOException {<a name="line.371"></a> +<span class="sourceLineNo">372</span> List<InputSplit> resultList = new ArrayList<>();<a name="line.372"></a> +<span class="sourceLineNo">373</span> Configuration conf = context.getConfiguration();<a name="line.373"></a> +<span class="sourceLineNo">374</span> //The default data skew ratio is 3<a name="line.374"></a> +<span class="sourceLineNo">375</span> long dataSkewRatio = conf.getLong(INPUT_AUTOBALANCE_MAXSKEWRATIO, 3);<a name="line.375"></a> +<span class="sourceLineNo">376</span> //It determines which mode to use: text key mode or binary key mode. The default is text mode.<a name="line.376"></a> +<span class="sourceLineNo">377</span> boolean isTextKey = context.getConfiguration().getBoolean(TABLE_ROW_TEXTKEY, true);<a name="line.377"></a> +<span class="sourceLineNo">378</span> long dataSkewThreshold = dataSkewRatio * average;<a name="line.378"></a> +<span class="sourceLineNo">379</span> int count = 0;<a name="line.379"></a> +<span class="sourceLineNo">380</span> while (count < list.size()) {<a name="line.380"></a> +<span class="sourceLineNo">381</span> TableSplit ts = (TableSplit)list.get(count);<a name="line.381"></a> +<span class="sourceLineNo">382</span> TableName tableName = ts.getTable();<a name="line.382"></a> +<span class="sourceLineNo">383</span> String regionLocation = ts.getRegionLocation();<a name="line.383"></a> +<span class="sourceLineNo">384</span> String encodedRegionName = ts.getEncodedRegionName();<a name="line.384"></a> +<span class="sourceLineNo">385</span> long regionSize = ts.getLength();<a name="line.385"></a> +<span class="sourceLineNo">386</span> if (regionSize >= dataSkewThreshold) {<a name="line.386"></a> +<span class="sourceLineNo">387</span> // if the current region size is large than the data skew threshold,<a name="line.387"></a> +<span class="sourceLineNo">388</span> // split the region into two MapReduce input splits.<a name="line.388"></a> +<span class="sourceLineNo">389</span> byte[] splitKey = getSplitKey(ts.getStartRow(), ts.getEndRow(), isTextKey);<a name="line.389"></a> +<span class="sourceLineNo">390</span> if (Arrays.equals(ts.getEndRow(), splitKey)) {<a name="line.390"></a> +<span class="sourceLineNo">391</span> // Not splitting since the end key is the same as the split key<a name="line.391"></a> +<span class="sourceLineNo">392</span> resultList.add(ts);<a name="line.392"></a> +<span class="sourceLineNo">393</span> } else {<a name="line.393"></a> +<span class="sourceLineNo">394</span> //Set the size of child TableSplit as 1/2 of the region size. The exact size of the<a name="line.394"></a> +<span class="sourceLineNo">395</span> // MapReduce input splits is not far off.<a name="line.395"></a> +<span class="sourceLineNo">396</span> TableSplit t1 = new TableSplit(tableName, scan, ts.getStartRow(), splitKey,<a name="line.396"></a> +<span class="sourceLineNo">397</span> regionLocation, regionSize / 2);<a name="line.397"></a> +<span class="sourceLineNo">398</span> TableSplit t2 = new TableSplit(tableName, scan, splitKey, ts.getEndRow(), regionLocation,<a name="line.398"></a> +<span class="sourceLineNo">399</span> regionSize - regionSize / 2);<a name="line.399"></a> +<span class="sourceLineNo">400</span> resultList.add(t1);<a name="line.400"></a> +<span class="sourceLineNo">401</span> resultList.add(t2);<a name="line.401"></a> +<span class="sourceLineNo">402</span> }<a name="line.402"></a> +<span class="sourceLineNo">403</span> count++;<a name="line.403"></a> +<span class="sourceLineNo">404</span> } else if (regionSize >= average) {<a name="line.404"></a> +<span class="sourceLineNo">405</span> // if the region size between average size and data skew threshold size,<a name="line.405"></a> +<span class="sourceLineNo">406</span> // make this region as one MapReduce input split.<a name="line.406"></a> +<span class="sourceLineNo">407</span> resultList.add(ts);<a name="line.407"></a> +<span class="sourceLineNo">408</span> count++;<a name="line.408"></a> +<span class="sourceLineNo">409</span> } else {<a name="line.409"></a> +<span class="sourceLineNo">410</span> // if the total size of several small continuous regions less than the average region size,<a name="line.410"></a> +<span class="sourceLineNo">411</span> // combine them into one MapReduce input split.<a name="line.411"></a> +<span class="sourceLineNo">412</span> long totalSize = regionSize;<a name="line.412"></a> +<span class="sourceLineNo">413</span> byte[] splitStartKey = ts.getStartRow();<a name="line.413"></a> +<span class="sourceLineNo">414</span> byte[] splitEndKey = ts.getEndRow();<a name="line.414"></a> +<span class="sourceLineNo">415</span> count++;<a name="line.415"></a> +<span class="sourceLineNo">416</span> for (; count < list.size(); count++) {<a name="line.416"></a> +<span class="sourceLineNo">417</span> TableSplit nextRegion = (TableSplit)list.get(count);<a name="line.417"></a> +<span class="sourceLineNo">418</span> long nextRegionSize = nextRegion.getLength();<a name="line.418"></a> +<span class="sourceLineNo">419</span> if (totalSize + nextRegionSize <= dataSkewThreshold) {<a name="line.419"></a> +<span class="sourceLineNo">420</span> totalSize = totalSize + nextRegionSize;<a name="line.420"></a> +<span class="sourceLineNo">421</span> splitEndKey = nextRegion.getEndRow();<a name="line.421"></a> +<span class="sourceLineNo">422</span> } else {<a name="line.422"></a> +<span class="sourceLineNo">423</span> break;<a name="line.423"></a> +<span class="sourceLineNo">424</span> }<a name="line.424"
<TRUNCATED>
