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| <h2 title="Class RoundRobinTableInputFormat" class="title">Class RoundRobinTableInputFormat</h2> |
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| <dd>org.apache.hadoop.conf.Configurable</dd> |
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| <pre>@InterfaceAudience.Public |
| public class <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line.49">RoundRobinTableInputFormat</a> |
| extends <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></pre> |
| <div class="block">Process the return from super-class <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce"><code>TableInputFormat</code></a> (TIF) so as to undo any clumping of |
| <code>InputSplit</code>s around RegionServers. Spread splits broadly to distribute read-load over |
| RegionServers in the cluster. The super-class TIF returns splits in hbase:meta table order. |
| Adjacent or near-adjacent hbase:meta Regions can be hosted on the same RegionServer -- nothing |
| prevents this. This hbase:maeta ordering of InputSplit placement can be lumpy making it so some |
| RegionServers end up hosting lots of InputSplit scans while contemporaneously other RegionServers |
| host few or none. This class does a pass over the return from the super-class to better spread |
| the load. See the below helpful Flipkart blog post for a description and from where the base of |
| this code comes from (with permission).</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>https://tech.flipkart.com/is-data-locality-always-out-of-the-box-in-hadoop-not-really-2ae9c95163cb</code></dd> |
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| <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#INPUT_TABLE">INPUT_TABLE</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN">SCAN</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_BATCHSIZE">SCAN_BATCHSIZE</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_CACHEBLOCKS">SCAN_CACHEBLOCKS</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_CACHEDROWS">SCAN_CACHEDROWS</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_COLUMN_FAMILY">SCAN_COLUMN_FAMILY</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_COLUMNS">SCAN_COLUMNS</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_MAXVERSIONS">SCAN_MAXVERSIONS</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_ROW_START">SCAN_ROW_START</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_ROW_STOP">SCAN_ROW_STOP</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_TIMERANGE_END">SCAN_TIMERANGE_END</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_TIMERANGE_START">SCAN_TIMERANGE_START</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SCAN_TIMESTAMP">SCAN_TIMESTAMP</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#SHUFFLE_MAPS">SHUFFLE_MAPS</a></code></li> |
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| <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#MAPREDUCE_INPUT_AUTOBALANCE">MAPREDUCE_INPUT_AUTOBALANCE</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#MAX_AVERAGE_REGION_SIZE">MAX_AVERAGE_REGION_SIZE</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#NUM_MAPPERS_PER_REGION">NUM_MAPPERS_PER_REGION</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#RoundRobinTableInputFormat--">RoundRobinTableInputFormat</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><org.apache.hadoop.mapreduce.InputSplit></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#getSplits-org.apache.hadoop.mapreduce.JobContext-">getSplits</a></span>(org.apache.hadoop.mapreduce.JobContext context)</code> |
| <div class="block">Calculates the splits that will serve as input for the map tasks.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#main-java.lang.String:A-">main</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args)</code> |
| <div class="block">Pass table name as argument.</div> |
| </td> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.mapreduce.<a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#addColumns-org.apache.hadoop.hbase.client.Scan-byte:A:A-">addColumns</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#configureSplitTable-org.apache.hadoop.mapreduce.Job-org.apache.hadoop.hbase.TableName-">configureSplitTable</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#createScanFromConfiguration-org.apache.hadoop.conf.Configuration-">createScanFromConfiguration</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#getConf--">getConf</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#getStartEndKeys--">getStartEndKeys</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#initialize-org.apache.hadoop.mapreduce.JobContext-">initialize</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code></li> |
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| <h3>Methods inherited from class org.apache.hadoop.hbase.mapreduce.<a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormatBase</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#calculateAutoBalancedSplits-java.util.List-long-">calculateAutoBalancedSplits</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#closeTable--">closeTable</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#createNInputSplitsUniform-org.apache.hadoop.mapreduce.InputSplit-int-">createNInputSplitsUniform</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#createRecordReader-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">createRecordReader</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#getAdmin--">getAdmin</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#getRegionLocator--">getRegionLocator</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#getScan--">getScan</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#getTable--">getTable</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#includeRegionInSplit-byte:A-byte:A-">includeRegionInSplit</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#initializeTable-org.apache.hadoop.hbase.client.Connection-org.apache.hadoop.hbase.TableName-">initializeTable</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#setScan-org.apache.hadoop.hbase.client.Scan-">setScan</a>, <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormatBase.html#setTableRecordReader-org.apache.hadoop.hbase.mapreduce.TableRecordReader-">setTableRecordReader</a></code></li> |
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| <h4>RoundRobinTableInputFormat</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line.49">RoundRobinTableInputFormat</a>()</pre> |
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| <h4>getSplits</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><org.apache.hadoop.mapreduce.InputSplit> <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line.62">getSplits</a>(org.apache.hadoop.mapreduce.JobContext context) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#getSplits-org.apache.hadoop.mapreduce.JobContext-">TableInputFormat</a></code></span></div> |
| <div class="block">Calculates the splits that will serve as input for the map tasks. The |
| number of splits matches the number of regions in a table. Splits are shuffled if |
| required.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html#getSplits-org.apache.hadoop.mapreduce.JobContext-">getSplits</a></code> in class <code><a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>context</code> - The current job context.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The list of input splits.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - When creating the list of splits fails.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>InputFormat.getSplits( |
| org.apache.hadoop.mapreduce.JobContext)</code></dd> |
| </dl> |
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| <h4>main</h4> |
| <pre>public static void <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line.159">main</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>[] args) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Pass table name as argument. Set the zk ensemble to use with the System property |
| 'hbase.zookeeper.quorum'</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
| </dl> |
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