http://git-wip-us.apache.org/repos/asf/hbase-site/blob/0e1d8d25/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html
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--- 
a/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html
+++ 
b/apidocs/src-html/org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html
@@ -61,607 +61,615 @@
 <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> * &lt;p&gt;<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> * &lt;pre&gt;<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> * &lt;/pre&gt;<a name="line.95"></a>
-<span class="sourceLineNo">096</span> *<a name="line.96"></a>
+<span class="sourceLineNo">056</span>import 
org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;<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> * &lt;p&gt;<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> * &lt;pre&gt;<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> * &lt;/pre&gt;<a name="line.96"></a>
 <span class="sourceLineNo">097</span> *<a name="line.97"></a>
-<span class="sourceLineNo">098</span> * The number of InputSplits(mappers) 
match the number of regions in a table by default.<a name="line.98"></a>
-<span class="sourceLineNo">099</span> * Set 
"hbase.mapreduce.tableinput.mappers.per.region" to specify how many mappers per 
region, set<a name="line.99"></a>
-<span class="sourceLineNo">100</span> * this property will disable autobalance 
below.\<a name="line.100"></a>
-<span class="sourceLineNo">101</span> * Set 
"hbase.mapreduce.tif.input.autobalance" to enable autobalance, hbase will 
assign mappers<a name="line.101"></a>
-<span class="sourceLineNo">102</span> * based on average region size; For 
regions, whose size larger than average region size may assigned<a 
name="line.102"></a>
-<span class="sourceLineNo">103</span> * more mappers, and for smaller one, 
they may group together to use one mapper. If actual average<a 
name="line.103"></a>
-<span class="sourceLineNo">104</span> * region size is too big, like 50G, it 
is not good to only assign 1 mapper for those large regions.<a 
name="line.104"></a>
-<span class="sourceLineNo">105</span> * Use 
"hbase.mapreduce.tif.ave.regionsize" to set max average region size when enable 
"autobalanece",<a name="line.105"></a>
-<span class="sourceLineNo">106</span> * default mas average region size is 
8G.<a name="line.106"></a>
-<span class="sourceLineNo">107</span> */<a name="line.107"></a>
-<span class="sourceLineNo">108</span>@InterfaceAudience.Public<a 
name="line.108"></a>
-<span class="sourceLineNo">109</span>public abstract class 
TableInputFormatBase<a name="line.109"></a>
-<span class="sourceLineNo">110</span>    extends 
InputFormat&lt;ImmutableBytesWritable, Result&gt; {<a name="line.110"></a>
-<span class="sourceLineNo">111</span><a name="line.111"></a>
-<span class="sourceLineNo">112</span>  private static final Logger LOG = 
LoggerFactory.getLogger(TableInputFormatBase.class);<a name="line.112"></a>
-<span class="sourceLineNo">113</span><a name="line.113"></a>
-<span class="sourceLineNo">114</span>  private static final String 
NOT_INITIALIZED = "The input format instance has not been properly " +<a 
name="line.114"></a>
-<span class="sourceLineNo">115</span>      "initialized. Ensure you call 
initializeTable either in your constructor or initialize " +<a 
name="line.115"></a>
-<span class="sourceLineNo">116</span>      "method";<a name="line.116"></a>
-<span class="sourceLineNo">117</span>  private static final String 
INITIALIZATION_ERROR = "Cannot create a record reader because of a" +<a 
name="line.117"></a>
-<span class="sourceLineNo">118</span>      " previous error. Please look at 
the previous logs lines from" +<a name="line.118"></a>
-<span class="sourceLineNo">119</span>      " the task's full log for more 
details.";<a name="line.119"></a>
-<span class="sourceLineNo">120</span><a name="line.120"></a>
-<span class="sourceLineNo">121</span>  /** Specify if we enable auto-balance 
to set number of mappers in M/R jobs. */<a name="line.121"></a>
-<span class="sourceLineNo">122</span>  public static final String 
MAPREDUCE_INPUT_AUTOBALANCE = "hbase.mapreduce.tif.input.autobalance";<a 
name="line.122"></a>
-<span class="sourceLineNo">123</span>  /** In auto-balance, we split input by 
ave region size, if calculated region size is too big, we can set it. */<a 
name="line.123"></a>
-<span class="sourceLineNo">124</span>  public static final String 
MAX_AVERAGE_REGION_SIZE = "hbase.mapreduce.tif.ave.regionsize";<a 
name="line.124"></a>
-<span class="sourceLineNo">125</span><a name="line.125"></a>
-<span class="sourceLineNo">126</span>  /** Set the number of Mappers for each 
region, all regions have same number of Mappers */<a name="line.126"></a>
-<span class="sourceLineNo">127</span>  public static final String 
NUM_MAPPERS_PER_REGION = "hbase.mapreduce.tableinput.mappers.per.region";<a 
name="line.127"></a>
-<span class="sourceLineNo">128</span><a name="line.128"></a>
+<span class="sourceLineNo">098</span> *<a name="line.98"></a>
+<span class="sourceLineNo">099</span> * The number of InputSplits(mappers) 
match the number of regions in a table by default.<a name="line.99"></a>
+<span class="sourceLineNo">100</span> * Set 
"hbase.mapreduce.tableinput.mappers.per.region" to specify how many mappers per 
region, set<a name="line.100"></a>
+<span class="sourceLineNo">101</span> * this property will disable autobalance 
below.\<a name="line.101"></a>
+<span class="sourceLineNo">102</span> * Set 
"hbase.mapreduce.tif.input.autobalance" to enable autobalance, hbase will 
assign mappers<a name="line.102"></a>
+<span class="sourceLineNo">103</span> * based on average region size; For 
regions, whose size larger than average region size may assigned<a 
name="line.103"></a>
+<span class="sourceLineNo">104</span> * more mappers, and for smaller one, 
they may group together to use one mapper. If actual average<a 
name="line.104"></a>
+<span class="sourceLineNo">105</span> * region size is too big, like 50G, it 
is not good to only assign 1 mapper for those large regions.<a 
name="line.105"></a>
+<span class="sourceLineNo">106</span> * Use 
"hbase.mapreduce.tif.ave.regionsize" to set max average region size when enable 
"autobalanece",<a name="line.106"></a>
+<span class="sourceLineNo">107</span> * default mas average region size is 
8G.<a name="line.107"></a>
+<span class="sourceLineNo">108</span> */<a name="line.108"></a>
+<span class="sourceLineNo">109</span>@InterfaceAudience.Public<a 
name="line.109"></a>
+<span class="sourceLineNo">110</span>public abstract class 
TableInputFormatBase<a name="line.110"></a>
+<span class="sourceLineNo">111</span>    extends 
InputFormat&lt;ImmutableBytesWritable, Result&gt; {<a name="line.111"></a>
+<span class="sourceLineNo">112</span><a name="line.112"></a>
+<span class="sourceLineNo">113</span>  private static final Logger LOG = 
LoggerFactory.getLogger(TableInputFormatBase.class);<a name="line.113"></a>
+<span class="sourceLineNo">114</span><a name="line.114"></a>
+<span class="sourceLineNo">115</span>  private static final String 
NOT_INITIALIZED = "The input format instance has not been properly " +<a 
name="line.115"></a>
+<span class="sourceLineNo">116</span>      "initialized. Ensure you call 
initializeTable either in your constructor or initialize " +<a 
name="line.116"></a>
+<span class="sourceLineNo">117</span>      "method";<a name="line.117"></a>
+<span class="sourceLineNo">118</span>  private static final String 
INITIALIZATION_ERROR = "Cannot create a record reader because of a" +<a 
name="line.118"></a>
+<span class="sourceLineNo">119</span>      " previous error. Please look at 
the previous logs lines from" +<a name="line.119"></a>
+<span class="sourceLineNo">120</span>      " the task's full log for more 
details.";<a name="line.120"></a>
+<span class="sourceLineNo">121</span><a name="line.121"></a>
+<span class="sourceLineNo">122</span>  /** Specify if we enable auto-balance 
to set number of mappers in M/R jobs. */<a name="line.122"></a>
+<span class="sourceLineNo">123</span>  public static final String 
MAPREDUCE_INPUT_AUTOBALANCE = "hbase.mapreduce.tif.input.autobalance";<a 
name="line.123"></a>
+<span class="sourceLineNo">124</span>  /** In auto-balance, we split input by 
ave region size, if calculated region size is too big, we can set it. */<a 
name="line.124"></a>
+<span class="sourceLineNo">125</span>  public static final String 
MAX_AVERAGE_REGION_SIZE = "hbase.mapreduce.tif.ave.regionsize";<a 
name="line.125"></a>
+<span class="sourceLineNo">126</span><a name="line.126"></a>
+<span class="sourceLineNo">127</span>  /** Set the number of Mappers for each 
region, all regions have same number of Mappers */<a name="line.127"></a>
+<span class="sourceLineNo">128</span>  public static final String 
NUM_MAPPERS_PER_REGION = "hbase.mapreduce.tableinput.mappers.per.region";<a 
name="line.128"></a>
 <span class="sourceLineNo">129</span><a name="line.129"></a>
-<span class="sourceLineNo">130</span>  /** Holds the details for the internal 
scanner.<a name="line.130"></a>
-<span class="sourceLineNo">131</span>   *<a name="line.131"></a>
-<span class="sourceLineNo">132</span>   * @see Scan */<a name="line.132"></a>
-<span class="sourceLineNo">133</span>  private Scan scan = null;<a 
name="line.133"></a>
-<span class="sourceLineNo">134</span>  /** The {@link Admin}. */<a 
name="line.134"></a>
-<span class="sourceLineNo">135</span>  private Admin admin;<a 
name="line.135"></a>
-<span class="sourceLineNo">136</span>  /** The {@link Table} to scan. */<a 
name="line.136"></a>
-<span class="sourceLineNo">137</span>  private Table table;<a 
name="line.137"></a>
-<span class="sourceLineNo">138</span>  /** The {@link RegionLocator} of the 
table. */<a name="line.138"></a>
-<span class="sourceLineNo">139</span>  private RegionLocator regionLocator;<a 
name="line.139"></a>
-<span class="sourceLineNo">140</span>  /** The reader scanning the table, can 
be a custom one. */<a name="line.140"></a>
-<span class="sourceLineNo">141</span>  private TableRecordReader 
tableRecordReader = null;<a name="line.141"></a>
-<span class="sourceLineNo">142</span>  /** The underlying {@link Connection} 
of the table. */<a name="line.142"></a>
-<span class="sourceLineNo">143</span>  private Connection connection;<a 
name="line.143"></a>
-<span class="sourceLineNo">144</span><a name="line.144"></a>
+<span class="sourceLineNo">130</span><a name="line.130"></a>
+<span class="sourceLineNo">131</span>  /** Holds the details for the internal 
scanner.<a name="line.131"></a>
+<span class="sourceLineNo">132</span>   *<a name="line.132"></a>
+<span class="sourceLineNo">133</span>   * @see Scan */<a name="line.133"></a>
+<span class="sourceLineNo">134</span>  private Scan scan = null;<a 
name="line.134"></a>
+<span class="sourceLineNo">135</span>  /** The {@link Admin}. */<a 
name="line.135"></a>
+<span class="sourceLineNo">136</span>  private Admin admin;<a 
name="line.136"></a>
+<span class="sourceLineNo">137</span>  /** The {@link Table} to scan. */<a 
name="line.137"></a>
+<span class="sourceLineNo">138</span>  private Table table;<a 
name="line.138"></a>
+<span class="sourceLineNo">139</span>  /** The {@link RegionLocator} of the 
table. */<a name="line.139"></a>
+<span class="sourceLineNo">140</span>  private RegionLocator regionLocator;<a 
name="line.140"></a>
+<span class="sourceLineNo">141</span>  /** The reader scanning the table, can 
be a custom one. */<a name="line.141"></a>
+<span class="sourceLineNo">142</span>  private TableRecordReader 
tableRecordReader = null;<a name="line.142"></a>
+<span class="sourceLineNo">143</span>  /** The underlying {@link Connection} 
of the table. */<a name="line.143"></a>
+<span class="sourceLineNo">144</span>  private Connection connection;<a 
name="line.144"></a>
 <span class="sourceLineNo">145</span><a name="line.145"></a>
-<span class="sourceLineNo">146</span>  /** The reverse DNS lookup cache 
mapping: IPAddress =&gt; HostName */<a name="line.146"></a>
-<span class="sourceLineNo">147</span>  private HashMap&lt;InetAddress, 
String&gt; reverseDNSCacheMap =<a name="line.147"></a>
-<span class="sourceLineNo">148</span>      new HashMap&lt;&gt;();<a 
name="line.148"></a>
-<span class="sourceLineNo">149</span><a name="line.149"></a>
-<span class="sourceLineNo">150</span>  /**<a name="line.150"></a>
-<span class="sourceLineNo">151</span>   * Builds a {@link TableRecordReader}. 
If no {@link TableRecordReader} was provided, uses<a name="line.151"></a>
-<span class="sourceLineNo">152</span>   * the default.<a name="line.152"></a>
-<span class="sourceLineNo">153</span>   *<a name="line.153"></a>
-<span class="sourceLineNo">154</span>   * @param split  The split to work 
with.<a name="line.154"></a>
-<span class="sourceLineNo">155</span>   * @param context  The current 
context.<a name="line.155"></a>
-<span class="sourceLineNo">156</span>   * @return The newly created record 
reader.<a name="line.156"></a>
-<span class="sourceLineNo">157</span>   * @throws IOException When creating 
the reader fails.<a name="line.157"></a>
-<span class="sourceLineNo">158</span>   * @see 
org.apache.hadoop.mapreduce.InputFormat#createRecordReader(<a 
name="line.158"></a>
-<span class="sourceLineNo">159</span>   *   
org.apache.hadoop.mapreduce.InputSplit,<a name="line.159"></a>
-<span class="sourceLineNo">160</span>   *   
org.apache.hadoop.mapreduce.TaskAttemptContext)<a name="line.160"></a>
-<span class="sourceLineNo">161</span>   */<a name="line.161"></a>
-<span class="sourceLineNo">162</span>  @Override<a name="line.162"></a>
-<span class="sourceLineNo">163</span>  public 
RecordReader&lt;ImmutableBytesWritable, Result&gt; createRecordReader(<a 
name="line.163"></a>
-<span class="sourceLineNo">164</span>      InputSplit split, 
TaskAttemptContext context)<a name="line.164"></a>
-<span class="sourceLineNo">165</span>      throws IOException {<a 
name="line.165"></a>
-<span class="sourceLineNo">166</span>    // Just in case a subclass is relying 
on JobConfigurable magic.<a name="line.166"></a>
-<span class="sourceLineNo">167</span>    if (table == null) {<a 
name="line.167"></a>
-<span class="sourceLineNo">168</span>      initialize(context);<a 
name="line.168"></a>
-<span class="sourceLineNo">169</span>    }<a name="line.169"></a>
-<span class="sourceLineNo">170</span>    // null check in case our child 
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been implemented in the subclass.<a name="line.250"></a>
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IOException(INITIALIZATION_ERROR);<a name="line.251"></a>
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exception) {<a name="line.253"></a>
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oneInputSplitPerRegion();<a name="line.258"></a>
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each region<a name="line.260"></a>
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(context.getConfiguration().get(NUM_MAPPERS_PER_REGION) != null) {<a 
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context.getConfiguration().getInt(NUM_MAPPERS_PER_REGION, 1);<a 
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ArrayList&lt;&gt;();<a name="line.263"></a>
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splits.size(); i++) {<a name="line.264"></a>
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createNInputSplitsUniform(splits.get(i), nSplitsPerRegion);<a 
name="line.265"></a>
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+<span class="sourceLineNo">270</span><a name="line.270"></a>
+<span class="sourceLineNo">271</span>      //The default value of 
"hbase.mapreduce.input.autobalance" is false.<a name="line.271"></a>
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(context.getConfiguration().getBoolean(MAPREDUCE_INPUT_AUTOBALANCE, false)) {<a 
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calculateAutoBalancedSplits(splits, maxAveRegionSize);<a name="line.275"></a>
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name="line.291"></a>
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oneInputSplitPerRegion() throws IOException {<a name="line.293"></a>
+<span class="sourceLineNo">294</span>    RegionSizeCalculator sizeCalculator 
=<a name="line.294"></a>
+<span class="sourceLineNo">295</span>        
createRegionSizeCalculator(getRegionLocator(), getAdmin());<a 
name="line.295"></a>
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getRegionLocator().getRegionLocation(HConstants.EMPTY_BYTE_ARRAY, false);<a 
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sizeCalculator.getRegionSize(regLoc.getRegionInfo().getRegionName());<a 
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TableSplit(tableName, scan,<a name="line.309"></a>
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HConstants.EMPTY_BYTE_ARRAY, regLoc<a name="line.310"></a>
+<span class="sourceLineNo">311</span>          
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+<span class="sourceLineNo">315</span>    List&lt;InputSplit&gt; splits = new 
ArrayList&lt;&gt;(keys.getFirst().length);<a name="line.315"></a>
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keys.getFirst().length; i++) {<a name="line.316"></a>
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Bytes.compareTo(keys.getSecond()[i], stopRow) &lt;= 0) &amp;&amp;<a 
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+<span class="sourceLineNo">334</span>            keys.getSecond()[i] : 
stopRow;<a name="line.334"></a>
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name="line.351"></a>
+<span class="sourceLineNo">352</span>        if (LOG.isDebugEnabled()) {<a 
name="line.352"></a>
+<span class="sourceLineNo">353</span>          LOG.debug("getSplits: split 
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+<span class="sourceLineNo">354</span>        }<a name="line.354"></a>
+<span class="sourceLineNo">355</span>      }<a name="line.355"></a>
+<span class="sourceLineNo">356</span>    }<a name="line.356"></a>
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+<span class="sourceLineNo">358</span>  }<a name="line.358"></a>
+<span class="sourceLineNo">359</span><a name="line.359"></a>
+<span class="sourceLineNo">360</span>  /**<a name="line.360"></a>
+<span class="sourceLineNo">361</span>   * Create n splits for one InputSplit, 
For now only support uniform distribution<a name="line.361"></a>
+<span class="sourceLineNo">362</span>   * @param split A TableSplit 
corresponding to a range of rowkeys<a name="line.362"></a>
+<span class="sourceLineNo">363</span>   * @param n     Number of ranges after 
splitting.  Pass 1 means no split for the range<a name="line.363"></a>
+<span class="sourceLineNo">364</span>   *              Pass 2 if you want to 
split the range in two;<a name="line.364"></a>
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+<span class="sourceLineNo">367</span>   */<a name="line.367"></a>
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createNInputSplitsUniform(InputSplit split, int n)<a name="line.368"></a>
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{<a name="line.369"></a>
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of TableSplit");<a name="line.373"></a>
+<span class="sourceLineNo">374</span>    }<a name="line.374"></a>
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using n = 1<a name="line.375"></a>
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+<span class="sourceLineNo">382</span><a name="line.382"></a>
+<span class="sourceLineNo">383</span>    // Collect Region related 
information<a name="line.383"></a>
+<span class="sourceLineNo">384</span>    TableSplit ts = (TableSplit) split;<a 
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+<span class="sourceLineNo">385</span>    TableName tableName = 
ts.getTable();<a name="line.385"></a>
+<span class="sourceLineNo">386</span>    String regionLocation = 
ts.getRegionLocation();<a name="line.386"></a>
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endRow is empty<a name="line.392"></a>
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endRow.length == 0){<a name="line.393"></a>
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+<span class="sourceLineNo">397</span>      endRow[0] = -1;<a 
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+<span class="sourceLineNo">398</span>    }<a name="line.398"></a>
+<span class="sourceLineNo">399</span>    if (startRow.length == 0 &amp;&amp; 
endRow.length != 0){<a name="line.399"></a>
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name="line.400"></a>
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+<span class="sourceLineNo">402</span>    }<a name="line.402"></a>
+<span class="sourceLineNo">403</span>    if (startRow.length != 0 &amp;&amp; 
endRow.length == 0){<a name="line.403"></a>
+<span class="sourceLineNo">404</span>      endRow =new 
byte[startRow.length];<a name="line.404"></a>
+<span class="sourceLineNo">405</span>      for (int k = 0; k &lt; 
startRow.length; k++){<a name="line.405"></a>
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name="line.406"></a>
+<span class="sourceLineNo">407</span>      }<a name="line.407"></a>
+<span class="sourceLineNo">408</span>    }<a name="line.408"></a>
+<span class="sourceLineNo">409</span><a name="line.409"></a>
+<span class="sourceLineNo">410</span>    // Split Region into n chunks 
evenly<a name="line.410"></a>
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+<span class="sourceLineNo">412</span>    for (int i = 0; i &lt; 
splitKeys.length - 1; i++) {<a name="line.412"></a>
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regionSize / n);<a name="line.416"></a>
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+<span class="sourceLineNo">418</span>    }<a name="line.418"></a>
+<span class="sourceLineNo">419</span>    return res;<a name="line.419"></a>
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the average region size.<a name="line.423"></a>
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splits before balance.<a name="line.426"></a>
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the list of splits fails.<a name="line.429"></a>
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calculateAutoBalancedSplits(List&lt;InputSplit&gt; splits, long 
maxAverageRegionSize)<a name="line.433"></a>
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+<span class="sourceLineNo">439</span>    long totalRegionSize = 0;<a 
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i++) {<a name="line.440"></a>
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splits.get(i);<a name="line.441"></a>
+<span class="sourceLineNo">442</span>      totalRegionSize += 
ts.getLength();<a name="line.442"></a>
+<span class="sourceLineNo">443</span>    }<a name="line.443"></a>
+<span class="sourceLineNo">444</span>    long averageRegionSize = 
totalRegionSize / splits.size();<a name="line.444"></a>
+<span class="sourceLineNo">445</span>    // totalRegionSize might be overflow, 
and the averageRegionSize must be positive.<a name="line

<TRUNCATED>

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