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| <h2 title="Class MultiTableInputFormatBase" class="title">Class MultiTableInputFormatBase</h2> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce">MultiTableInputFormat</a></dd> |
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| <pre>@InterfaceAudience.Public |
| public abstract class <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.55">MultiTableInputFormatBase</a> |
| extends org.apache.hadoop.mapreduce.InputFormat<<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>></pre> |
| <div class="block">A base for <a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormat.html" title="class in org.apache.hadoop.hbase.mapreduce"><code>MultiTableInputFormat</code></a>s. Receives a list of |
| <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> instances that define the input tables and |
| filters etc. Subclasses may use other TableRecordReader implementations.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#MultiTableInputFormatBase--">MultiTableInputFormatBase</a></span>()</code> </td> |
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| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>org.apache.hadoop.mapreduce.RecordReader<<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#createRecordReader-org.apache.hadoop.mapreduce.InputSplit-org.apache.hadoop.mapreduce.TaskAttemptContext-">createRecordReader</a></span>(org.apache.hadoop.mapreduce.InputSplit split, |
| org.apache.hadoop.mapreduce.TaskAttemptContext context)</code> |
| <div class="block">Builds a TableRecordReader.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected <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><<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#getScans--">getScans</a></span>()</code> |
| <div class="block">Allows subclasses to get the list of <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> objects.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <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/MultiTableInputFormatBase.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="i3" class="rowColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#includeRegionInSplit-byte:A-byte:A-">includeRegionInSplit</a></span>(byte[] startKey, |
| byte[] endKey)</code> |
| <div class="block">Test if the given region is to be included in the InputSplit while |
| splitting the regions of a table.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#setScans-java.util.List-">setScans</a></span>(<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><<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>> scans)</code> |
| <div class="block">Allows subclasses to set the list of <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> objects.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#setTableRecordReader-org.apache.hadoop.hbase.mapreduce.TableRecordReader-">setTableRecordReader</a></span>(<a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableRecordReader.html" title="class in org.apache.hadoop.hbase.mapreduce">TableRecordReader</a> tableRecordReader)</code> |
| <div class="block">Allows subclasses to set the <a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableRecordReader.html" title="class in org.apache.hadoop.hbase.mapreduce"><code>TableRecordReader</code></a>.</div> |
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| <h4>MultiTableInputFormatBase</h4> |
| <pre>public <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.55">MultiTableInputFormatBase</a>()</pre> |
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| <h4>createRecordReader</h4> |
| <pre>public org.apache.hadoop.mapreduce.RecordReader<<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.80">createRecordReader</a>(org.apache.hadoop.mapreduce.InputSplit split, |
| org.apache.hadoop.mapreduce.TaskAttemptContext 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>, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></pre> |
| <div class="block">Builds a TableRecordReader. If no TableRecordReader was provided, uses the |
| default.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>createRecordReader</code> in class <code>org.apache.hadoop.mapreduce.InputFormat<<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>split</code> - The split to work with.</dd> |
| <dd><code>context</code> - The current context.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>The newly created record reader.</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 reader fails.</dd> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/InterruptedException.html?is-external=true" title="class or interface in java.lang">InterruptedException</a></code> - when record reader initialization fails</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><code>InputFormat.createRecordReader( |
| org.apache.hadoop.mapreduce.InputSplit, |
| org.apache.hadoop.mapreduce.TaskAttemptContext)</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSplits-org.apache.hadoop.mapreduce.JobContext-"> |
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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/MultiTableInputFormatBase.html#line.158">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">Calculates the splits that will serve as input for the map tasks. The |
| number of splits matches the number of regions in a table.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code>getSplits</code> in class <code>org.apache.hadoop.mapreduce.InputFormat<<a href="../../../../../org/apache/hadoop/hbase/io/ImmutableBytesWritable.html" title="class in org.apache.hadoop.hbase.io">ImmutableBytesWritable</a>,<a href="../../../../../org/apache/hadoop/hbase/client/Result.html" title="class in org.apache.hadoop.hbase.client">Result</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> |
| </li> |
| </ul> |
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| <h4>includeRegionInSplit</h4> |
| <pre>protected boolean <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.268">includeRegionInSplit</a>(byte[] startKey, |
| byte[] endKey)</pre> |
| <div class="block">Test if the given region is to be included in the InputSplit while |
| splitting the regions of a table. |
| <p> |
| This optimization is effective when there is a specific reasoning to |
| exclude an entire region from the M-R job, (and hence, not contributing to |
| the InputSplit), given the start and end keys of the same. <br> |
| Useful when we need to remember the last-processed top record and revisit |
| the [last, current) interval for M-R processing, continuously. In addition |
| to reducing InputSplits, reduces the load on the region server as well, due |
| to the ordering of the keys. <br> |
| <br> |
| Note: It is possible that <code>endKey.length() == 0 </code> , for the last |
| (recent) region. <br> |
| Override this method, if you want to bulk exclude regions altogether from |
| M-R. By default, no region is excluded( i.e. all regions are included).</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>startKey</code> - Start key of the region</dd> |
| <dd><code>endKey</code> - End key of the region</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>true, if this region needs to be included as part of the input |
| (default).</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getScans--"> |
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| <h4>getScans</h4> |
| <pre>protected <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><<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>> <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.276">getScans</a>()</pre> |
| <div class="block">Allows subclasses to get the list of <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> objects.</div> |
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| <h4>setScans</h4> |
| <pre>protected void <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.285">setScans</a>(<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><<a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client">Scan</a>> scans)</pre> |
| <div class="block">Allows subclasses to set the list of <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> objects.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>scans</code> - The list of <a href="../../../../../org/apache/hadoop/hbase/client/Scan.html" title="class in org.apache.hadoop.hbase.client"><code>Scan</code></a> used to define the input</dd> |
| </dl> |
| </li> |
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| <h4>setTableRecordReader</h4> |
| <pre>protected void <a href="../../../../../src-html/org/apache/hadoop/hbase/mapreduce/MultiTableInputFormatBase.html#line.295">setTableRecordReader</a>(<a href="../../../../../org/apache/hadoop/hbase/mapreduce/TableRecordReader.html" title="class in org.apache.hadoop.hbase.mapreduce">TableRecordReader</a> tableRecordReader)</pre> |
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