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| <div class="sub-title"><span class="package-label-in-type">Package</span> <a href="package-summary.html">org.apache.hadoop.hbase.mapreduce</a></div> |
| <h1 title="Class RoundRobinTableInputFormat" class="title">Class RoundRobinTableInputFormat</h1> |
| </div> |
| <div class="inheritance" title="Inheritance Tree"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">java.lang.Object</a> |
| <div class="inheritance">org.apache.hadoop.mapreduce.InputFormat<<a href="../io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<wbr><a href="../client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>> |
| <div class="inheritance"><a href="TableInputFormatBase.html" title="class in org.apache.hadoop.hbase.mapreduce">org.apache.hadoop.hbase.mapreduce.TableInputFormatBase</a> |
| <div class="inheritance"><a href="TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">org.apache.hadoop.hbase.mapreduce.TableInputFormat</a> |
| <div class="inheritance">org.apache.hadoop.hbase.mapreduce.RoundRobinTableInputFormat</div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <section class="class-description" id="class-description"> |
| <dl class="notes"> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><code>org.apache.hadoop.conf.Configurable</code></dd> |
| </dl> |
| <hr> |
| <div class="type-signature"><span class="annotations">@Public |
| </span><span class="modifiers">public class </span><span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-48">RoundRobinTableInputFormat</a></span> |
| <span class="extends-implements">extends <a href="TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></span></div> |
| <div class="block">Process the return from super-class <a href="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> |
| </section> |
| <section class="summary"> |
| <ul class="summary-list"> |
| <!-- =========== FIELD SUMMARY =========== --> |
| <li> |
| <section class="field-summary" id="field-summary"> |
| <h2>Field Summary</h2> |
| <div class="caption"><span>Fields</span></div> |
| <div class="summary-table three-column-summary"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Field</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color"><code>(package private) static <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></code></div> |
| <div class="col-second even-row-color"><code><a href="#HBASE_REGIONSIZECALCULATOR_ENABLE" class="member-name-link">HBASE_REGIONSIZECALCULATOR_ENABLE</a></code></div> |
| <div class="col-last even-row-color"> |
| <div class="block">Boolean config for whether superclass should produce InputSplits with 'lengths'.</div> |
| </div> |
| <div class="col-first odd-row-color"><code>private <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Boolean.html" title="class or interface in java.lang" class="external-link">Boolean</a></code></div> |
| <div class="col-second odd-row-color"><code><a href="#hbaseRegionsizecalculatorEnableOriginalValue" class="member-name-link">hbaseRegionsizecalculatorEnableOriginalValue</a></code></div> |
| <div class="col-last odd-row-color"> </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.mapreduce.TableInputFormat">Fields inherited from class org.apache.hadoop.hbase.mapreduce.<a href="TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></h3> |
| <code><a href="TableInputFormat.html#INPUT_TABLE">INPUT_TABLE</a>, <a href="TableInputFormat.html#SCAN">SCAN</a>, <a href="TableInputFormat.html#SCAN_BATCHSIZE">SCAN_BATCHSIZE</a>, <a href="TableInputFormat.html#SCAN_CACHEBLOCKS">SCAN_CACHEBLOCKS</a>, <a href="TableInputFormat.html#SCAN_CACHEDROWS">SCAN_CACHEDROWS</a>, <a href="TableInputFormat.html#SCAN_COLUMN_FAMILY">SCAN_COLUMN_FAMILY</a>, <a href="TableInputFormat.html#SCAN_COLUMNS">SCAN_COLUMNS</a>, <a href="TableInputFormat.html#SCAN_MAXVERSIONS">SCAN_MAXVERSIONS</a>, <a href="TableInputFormat.html#SCAN_ROW_START">SCAN_ROW_START</a>, <a href="TableInputFormat.html#SCAN_ROW_STOP">SCAN_ROW_STOP</a>, <a href="TableInputFormat.html#SCAN_TIMERANGE_END">SCAN_TIMERANGE_END</a>, <a href="TableInputFormat.html#SCAN_TIMERANGE_START">SCAN_TIMERANGE_START</a>, <a href="TableInputFormat.html#SCAN_TIMESTAMP">SCAN_TIMESTAMP</a>, <a href="TableInputFormat.html#SHUFFLE_MAPS">SHUFFLE_MAPS</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="fields-inherited-from-class-org.apache.hadoop.hbase.mapreduce.TableInputFormatBase">Fields inherited from class org.apache.hadoop.hbase.mapreduce.<a href="TableInputFormatBase.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormatBase</a></h3> |
| <code><a href="TableInputFormatBase.html#MAPREDUCE_INPUT_AUTOBALANCE">MAPREDUCE_INPUT_AUTOBALANCE</a>, <a href="TableInputFormatBase.html#MAX_AVERAGE_REGION_SIZE">MAX_AVERAGE_REGION_SIZE</a>, <a href="TableInputFormatBase.html#NUM_MAPPERS_PER_REGION">NUM_MAPPERS_PER_REGION</a></code></div> |
| </section> |
| </li> |
| <!-- ======== CONSTRUCTOR SUMMARY ======== --> |
| <li> |
| <section class="constructor-summary" id="constructor-summary"> |
| <h2>Constructor Summary</h2> |
| <div class="caption"><span>Constructors</span></div> |
| <div class="summary-table two-column-summary"> |
| <div class="table-header col-first">Constructor</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-constructor-name even-row-color"><code><a href="#%3Cinit%3E()" class="member-name-link">RoundRobinTableInputFormat</a>()</code></div> |
| <div class="col-last even-row-color"> </div> |
| </div> |
| </section> |
| </li> |
| <!-- ========== METHOD SUMMARY =========== --> |
| <li> |
| <section class="method-summary" id="method-summary"> |
| <h2>Method Summary</h2> |
| <div id="method-summary-table"> |
| <div class="table-tabs" role="tablist" aria-orientation="horizontal"><button id="method-summary-table-tab0" role="tab" aria-selected="true" aria-controls="method-summary-table.tabpanel" tabindex="0" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table', 3)" class="active-table-tab">All Methods</button><button id="method-summary-table-tab1" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab1', 3)" class="table-tab">Static Methods</button><button id="method-summary-table-tab2" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab2', 3)" class="table-tab">Instance Methods</button><button id="method-summary-table-tab4" role="tab" aria-selected="false" aria-controls="method-summary-table.tabpanel" tabindex="-1" onkeydown="switchTab(event)" onclick="show('method-summary-table', 'method-summary-table-tab4', 3)" class="table-tab">Concrete Methods</button></div> |
| <div id="method-summary-table.tabpanel" role="tabpanel"> |
| <div class="summary-table three-column-summary" aria-labelledby="method-summary-table-tab0"> |
| <div class="table-header col-first">Modifier and Type</div> |
| <div class="table-header col-second">Method</div> |
| <div class="table-header col-last">Description</div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>(package private) void</code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#configure()" class="member-name-link">configure</a>()</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Adds a configuration to the Context disabling remote rpc'ing to figure Region size when |
| calculating InputSplits.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSplits(org.apache.hadoop.mapreduce.JobContext)" class="member-name-link">getSplits</a><wbr>(org.apache.hadoop.mapreduce.JobContext context)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Calculates the splits that will serve as input for the map tasks.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>(package private) <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#getSuperSplits(org.apache.hadoop.mapreduce.JobContext)" class="member-name-link">getSuperSplits</a><wbr>(org.apache.hadoop.mapreduce.JobContext context)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Call super-classes' getSplits.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code>static void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#main(java.lang.String%5B%5D)" class="member-name-link">main</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>[] args)</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"> |
| <div class="block">Pass table name as argument.</div> |
| </div> |
| <div class="col-first even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>(package private) <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></code></div> |
| <div class="col-second even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#roundRobin(java.util.List)" class="member-name-link">roundRobin</a><wbr>(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit> inputs)</code></div> |
| <div class="col-last even-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> |
| <div class="block">Spread the splits list so as to avoid clumping on RegionServers.</div> |
| </div> |
| <div class="col-first odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code>(package private) void</code></div> |
| <div class="col-second odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"><code><a href="#unconfigure()" class="member-name-link">unconfigure</a>()</code></div> |
| <div class="col-last odd-row-color method-summary-table method-summary-table-tab2 method-summary-table-tab4"> </div> |
| </div> |
| </div> |
| </div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.mapreduce.TableInputFormat">Methods inherited from class org.apache.hadoop.hbase.mapreduce.<a href="TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></h3> |
| <code><a href="TableInputFormat.html#addColumns(org.apache.hadoop.hbase.client.Scan,byte%5B%5D%5B%5D)">addColumns</a>, <a href="TableInputFormat.html#configureSplitTable(org.apache.hadoop.mapreduce.Job,org.apache.hadoop.hbase.TableName)">configureSplitTable</a>, <a href="TableInputFormat.html#createScanFromConfiguration(org.apache.hadoop.conf.Configuration)">createScanFromConfiguration</a>, <a href="TableInputFormat.html#getConf()">getConf</a>, <a href="TableInputFormat.html#getStartEndKeys()">getStartEndKeys</a>, <a href="TableInputFormat.html#initialize(org.apache.hadoop.mapreduce.JobContext)">initialize</a>, <a href="TableInputFormat.html#setConf(org.apache.hadoop.conf.Configuration)">setConf</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-org.apache.hadoop.hbase.mapreduce.TableInputFormatBase">Methods inherited from class org.apache.hadoop.hbase.mapreduce.<a href="TableInputFormatBase.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormatBase</a></h3> |
| <code><a href="TableInputFormatBase.html#calculateAutoBalancedSplits(java.util.List,long)">calculateAutoBalancedSplits</a>, <a href="TableInputFormatBase.html#closeTable()">closeTable</a>, <a href="TableInputFormatBase.html#createNInputSplitsUniform(org.apache.hadoop.mapreduce.InputSplit,int)">createNInputSplitsUniform</a>, <a href="TableInputFormatBase.html#createRecordReader(org.apache.hadoop.mapreduce.InputSplit,org.apache.hadoop.mapreduce.TaskAttemptContext)">createRecordReader</a>, <a href="TableInputFormatBase.html#createRegionSizeCalculator(org.apache.hadoop.hbase.client.RegionLocator,org.apache.hadoop.hbase.client.Admin)">createRegionSizeCalculator</a>, <a href="TableInputFormatBase.html#getAdmin()">getAdmin</a>, <a href="TableInputFormatBase.html#getRegionLocator()">getRegionLocator</a>, <a href="TableInputFormatBase.html#getScan()">getScan</a>, <a href="TableInputFormatBase.html#getTable()">getTable</a>, <a href="TableInputFormatBase.html#includeRegionInSplit(byte%5B%5D,byte%5B%5D)">includeRegionInSplit</a>, <a href="TableInputFormatBase.html#initializeTable(org.apache.hadoop.hbase.client.Connection,org.apache.hadoop.hbase.TableName)">initializeTable</a>, <a href="TableInputFormatBase.html#reverseDNS(java.net.InetAddress)">reverseDNS</a>, <a href="TableInputFormatBase.html#setScan(org.apache.hadoop.hbase.client.Scan)">setScan</a>, <a href="TableInputFormatBase.html#setTableRecordReader(org.apache.hadoop.hbase.mapreduce.TableRecordReader)">setTableRecordReader</a></code></div> |
| <div class="inherited-list"> |
| <h3 id="methods-inherited-from-class-java.lang.Object">Methods inherited from class java.lang.<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html" title="class or interface in java.lang" class="external-link">Object</a></h3> |
| <code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#clone()" title="class or interface in java.lang" class="external-link">clone</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang" class="external-link">equals</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#finalize()" title="class or interface in java.lang" class="external-link">finalize</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#getClass()" title="class or interface in java.lang" class="external-link">getClass</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#hashCode()" title="class or interface in java.lang" class="external-link">hashCode</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notify()" title="class or interface in java.lang" class="external-link">notify</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#notifyAll()" title="class or interface in java.lang" class="external-link">notifyAll</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#toString()" title="class or interface in java.lang" class="external-link">toString</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait()" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long)" title="class or interface in java.lang" class="external-link">wait</a>, <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Object.html#wait(long,int)" title="class or interface in java.lang" class="external-link">wait</a></code></div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| <section class="details"> |
| <ul class="details-list"> |
| <!-- ============ FIELD DETAIL =========== --> |
| <li> |
| <section class="field-details" id="field-detail"> |
| <h2>Field Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="hbaseRegionsizecalculatorEnableOriginalValue"> |
| <h3>hbaseRegionsizecalculatorEnableOriginalValue</h3> |
| <div class="member-signature"><span class="modifiers">private</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/Boolean.html" title="class or interface in java.lang" class="external-link">Boolean</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-50">hbaseRegionsizecalculatorEnableOriginalValue</a></span></div> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="HBASE_REGIONSIZECALCULATOR_ENABLE"> |
| <h3>HBASE_REGIONSIZECALCULATOR_ENABLE</h3> |
| <div class="member-signature"><span class="modifiers">static</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-59">HBASE_REGIONSIZECALCULATOR_ENABLE</a></span></div> |
| <div class="block">Boolean config for whether superclass should produce InputSplits with 'lengths'. If true, TIF |
| will query every RegionServer to get the 'size' of all involved Regions and this 'size' will be |
| used the the InputSplit length. If false, we skip this query and the super-classes returned |
| InputSplits will have lenghths of zero. This override will set the flag to false. All returned |
| lengths will be zero. Makes it so sorting on 'length' becomes a noop. The sort returned by this |
| override will prevail. Thats what we want.</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ========= CONSTRUCTOR DETAIL ======== --> |
| <li> |
| <section class="constructor-details" id="constructor-detail"> |
| <h2>Constructor Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="<init>()"> |
| <h3>RoundRobinTableInputFormat</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-49">RoundRobinTableInputFormat</a></span>()</div> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| <!-- ============ METHOD DETAIL ========== --> |
| <li> |
| <section class="method-details" id="method-detail"> |
| <h2>Method Details</h2> |
| <ul class="member-list"> |
| <li> |
| <section class="detail" id="getSplits(org.apache.hadoop.mapreduce.JobContext)"> |
| <h3>getSplits</h3> |
| <div class="member-signature"><span class="modifiers">public</span> <span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-61">getSplits</a></span><wbr><span class="parameters">(org.apache.hadoop.mapreduce.JobContext context)</span> |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block"><span class="descfrm-type-label">Description copied from class: <code><a href="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 class="notes"> |
| <dt>Overrides:</dt> |
| <dd><code><a href="TableInputFormat.html#getSplits(org.apache.hadoop.mapreduce.JobContext)">getSplits</a></code> in class <code><a href="TableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">TableInputFormat</a></code></dd> |
| <dt>Parameters:</dt> |
| <dd><code>context</code> - The current job context.</dd> |
| <dt>Returns:</dt> |
| <dd>The list of input splits.</dd> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code> - When creating the list of splits fails.</dd> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list-long"> |
| <li><code>InputFormat.getSplits(org.apache.hadoop.mapreduce.JobContext)</code></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="getSuperSplits(org.apache.hadoop.mapreduce.JobContext)"> |
| <h3>getSuperSplits</h3> |
| <div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-75">getSuperSplits</a></span><wbr><span class="parameters">(org.apache.hadoop.mapreduce.JobContext context)</span> |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block">Call super-classes' getSplits. Have it out here as its own method so can be overridden.</div> |
| <dl class="notes"> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="roundRobin(java.util.List)"> |
| <h3>roundRobin</h3> |
| <div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit></span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-84">roundRobin</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link">List</a><org.apache.hadoop.mapreduce.InputSplit> inputs)</span> |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block">Spread the splits list so as to avoid clumping on RegionServers. Order splits so every server |
| gets one split before a server gets a second, and so on; i.e. round-robin the splits amongst |
| the servers in the cluster.</div> |
| <dl class="notes"> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="configure()"> |
| <h3>configure</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-135">configure</a></span>()</div> |
| <div class="block">Adds a configuration to the Context disabling remote rpc'ing to figure Region size when |
| calculating InputSplits. See up in super-class TIF where we rpc to every server to find the |
| size of all involved Regions. Here we disable this super-class action. This means InputSplits |
| will have a length of zero. If all InputSplits have zero-length InputSplits, the ordering done |
| in here will 'pass-through' Hadoop's length-first sort. The superclass TIF will ask every node |
| for the current size of each of the participating Table Regions. It does this because it wants |
| to schedule the biggest Regions first (This fixation comes of hadoop itself -- see JobSubmitter |
| where it sorts inputs by size). This extra diligence takes time and is of no utility in this |
| RRTIF where spread is of more import than size-first. Also, if a rolling restart is happening |
| when we go to launch the job, the job launch may fail because the request for Region size fails |
| -- even after retries -- because rolled RegionServer may take a while to come online: e.g. it |
| takes java 90 seconds to allocate a 160G. RegionServer is offline during this time. The job |
| launch will fail with 'Connection rejected'. So, we set 'hbase.regionsizecalculator.enable' to |
| false here in RRTIF.</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="#unconfigure()"><code>unconfigure()</code></a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="unconfigure()"> |
| <h3>unconfigure</h3> |
| <div class="member-signature"><span class="return-type">void</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-146">unconfigure</a></span>()</div> |
| <dl class="notes"> |
| <dt>See Also:</dt> |
| <dd> |
| <ul class="see-list"> |
| <li><a href="#configure()"><code>configure()</code></a></li> |
| </ul> |
| </dd> |
| </dl> |
| </section> |
| </li> |
| <li> |
| <section class="detail" id="main(java.lang.String[])"> |
| <h3>main</h3> |
| <div class="member-signature"><span class="modifiers">public static</span> <span class="return-type">void</span> <span class="element-name"><a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/RoundRobinTableInputFormat.html#line-159">main</a></span><wbr><span class="parameters">(<a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/String.html" title="class or interface in java.lang" class="external-link">String</a>[] args)</span> |
| throws <span class="exceptions"><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></span></div> |
| <div class="block">Pass table name as argument. Set the zk ensemble to use with the System property |
| 'hbase.zookeeper.quorum'</div> |
| <dl class="notes"> |
| <dt>Throws:</dt> |
| <dd><code><a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/io/IOException.html" title="class or interface in java.io" class="external-link">IOException</a></code></dd> |
| </dl> |
| </section> |
| </li> |
| </ul> |
| </section> |
| </li> |
| </ul> |
| </section> |
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