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| <h2 title="Class NLineInputFormat" class="title">Class NLineInputFormat</h2> |
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| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">org.apache.hadoop.mapred.FileInputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></li> |
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| <li>org.apache.hadoop.mapred.lib.NLineInputFormat</li> |
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| <div class="description"> |
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| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>>, <a href="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</a></dd> |
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| <hr> |
| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">NLineInputFormat</span> |
| extends <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>> |
| implements <a href="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</a></pre> |
| <div class="block">NLineInputFormat which splits N lines of input as one split. |
| |
| In many "pleasantly" parallel applications, each process/mapper |
| processes the same input file (s), but with computations are |
| controlled by different parameters.(Referred to as "parameter sweeps"). |
| One way to achieve this, is to specify a set of parameters |
| (one set per line) as input in a control file |
| (which is the input path to the map-reduce application, |
| where as the input dataset is specified |
| via a config variable in JobConf.). |
| |
| The NLineInputFormat can be used in such applications, that splits |
| the input file such that by default, one line is fed as |
| a value to one map task, and key is the offset. |
| i.e. (k,v) is (LongWritable, Text). |
| The location hints will span the whole mapred cluster.</div> |
| </li> |
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| <h3>Fields inherited from class org.apache.hadoop.mapred.<a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#INPUT_DIR_NONRECURSIVE_IGNORE_SUBDIRS">INPUT_DIR_NONRECURSIVE_IGNORE_SUBDIRS</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#INPUT_DIR_RECURSIVE">INPUT_DIR_RECURSIVE</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#LOG">LOG</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#NUM_INPUT_FILES">NUM_INPUT_FILES</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html#NLineInputFormat--">NLineInputFormat</a></span>()</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html#configure-org.apache.hadoop.mapred.JobConf-">configure</a></span>(<a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</code> |
| <div class="block">Initializes a new instance from a <a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected static <a href="../../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html#createFileSplit-org.apache.hadoop.fs.Path-long-long-">createFileSplit</a></span>(<a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> fileName, |
| long begin, |
| long length)</code> |
| <div class="block">NLineInputFormat uses LineRecordReader, which always reads |
| (and consumes) at least one character out of its upper split |
| boundary.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html#getRecordReader-org.apache.hadoop.mapred.InputSplit-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.Reporter-">getRecordReader</a></span>(<a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</a> genericSplit, |
| <a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <a href="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</a> reporter)</code> |
| <div class="block">Get the <a href="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><code>RecordReader</code></a> for the given <a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html#getSplits-org.apache.hadoop.mapred.JobConf-int-">getSplits</a></span>(<a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| int numSplits)</code> |
| <div class="block">Logically splits the set of input files for the job, splits N lines |
| of the input as one split.</div> |
| </td> |
| </tr> |
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| <h3>Methods inherited from class org.apache.hadoop.mapred.<a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a></h3> |
| <code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#addInputPath-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.fs.Path-">addInputPath</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#addInputPathRecursively-java.util.List-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-org.apache.hadoop.fs.PathFilter-">addInputPathRecursively</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#addInputPaths-org.apache.hadoop.mapred.JobConf-java.lang.String-">addInputPaths</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#computeSplitSize-long-long-long-">computeSplitSize</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getBlockIndex-org.apache.hadoop.fs.BlockLocation:A-long-">getBlockIndex</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getInputPathFilter-org.apache.hadoop.mapred.JobConf-">getInputPathFilter</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getInputPaths-org.apache.hadoop.mapred.JobConf-">getInputPaths</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getSplitHosts-org.apache.hadoop.fs.BlockLocation:A-long-long-org.apache.hadoop.net.NetworkTopology-">getSplitHosts</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#isSplitable-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.fs.Path-">isSplitable</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#listStatus-org.apache.hadoop.mapred.JobConf-">listStatus</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#makeSplit-org.apache.hadoop.fs.Path-long-long-java.lang.String:A-">makeSplit</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#makeSplit-org.apache.hadoop.fs.Path-long-long-java.lang.String:A-java.lang.String:A-">makeSplit</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#setInputPathFilter-org.apache.hadoop.mapred.JobConf-java.lang.Class-">setInputPathFilter</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#setInputPaths-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.fs.Path...-">setInputPaths</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#setInputPaths-org.apache.hadoop.mapred.JobConf-java.lang.String-">setInputPaths</a>, <a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#setMinSplitSize-long-">setMinSplitSize</a></code></li> |
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| <h3>Constructor Detail</h3> |
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| <h4>NLineInputFormat</h4> |
| <pre>public NLineInputFormat()</pre> |
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| <h3>Method Detail</h3> |
| <a name="getRecordReader-org.apache.hadoop.mapred.InputSplit-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.Reporter-"> |
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| <h4>getRecordReader</h4> |
| <pre>public <a href="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>> getRecordReader(<a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</a> genericSplit, |
| <a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <a href="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</a> reporter) |
| 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 interface: <code><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html#getRecordReader-org.apache.hadoop.mapred.InputSplit-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.Reporter-">InputFormat</a></code></span></div> |
| <div class="block">Get the <a href="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><code>RecordReader</code></a> for the given <a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a>. |
| |
| <p>It is the responsibility of the <code>RecordReader</code> to respect |
| record boundaries while processing the logical split to present a |
| record-oriented view to the individual task.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html#getRecordReader-org.apache.hadoop.mapred.InputSplit-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.Reporter-">getRecordReader</a></code> in interface <code><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></dd> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getRecordReader-org.apache.hadoop.mapred.InputSplit-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.mapred.Reporter-">getRecordReader</a></code> in class <code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>genericSplit</code> - the <a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a></dd> |
| <dd><code>job</code> - the job that this split belongs to</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <a href="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><code>RecordReader</code></a></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></dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>getSplits</h4> |
| <pre>public <a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</a>[] getSplits(<a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| int numSplits) |
| 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">Logically splits the set of input files for the job, splits N lines |
| of the input as one split.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits-org.apache.hadoop.mapred.JobConf-int-">getSplits</a></code> in interface <code><a href="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></dd> |
| <dt><span class="overrideSpecifyLabel">Overrides:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getSplits-org.apache.hadoop.mapred.JobConf-int-">getSplits</a></code> in class <code><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a><<a href="../../../../../org/apache/hadoop/io/LongWritable.html" title="class in org.apache.hadoop.io">LongWritable</a>,<a href="../../../../../org/apache/hadoop/io/Text.html" title="class in org.apache.hadoop.io">Text</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>job</code> - job configuration.</dd> |
| <dd><code>numSplits</code> - the desired number of splits, a hint.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array of <a href="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a>s for the job.</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></dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../org/apache/hadoop/mapred/FileInputFormat.html#getSplits-org.apache.hadoop.mapred.JobConf-int-"><code>FileInputFormat.getSplits(JobConf, int)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="configure-org.apache.hadoop.mapred.JobConf-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>configure</h4> |
| <pre>public void configure(<a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure-org.apache.hadoop.mapred.JobConf-">JobConfigurable</a></code></span></div> |
| <div class="block">Initializes a new instance from a <a href="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/hadoop/mapred/JobConfigurable.html#configure-org.apache.hadoop.mapred.JobConf-">configure</a></code> in interface <code><a href="../../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the configuration</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createFileSplit-org.apache.hadoop.fs.Path-long-long-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>createFileSplit</h4> |
| <pre>protected static <a href="../../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</a> createFileSplit(<a href="../../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> fileName, |
| long begin, |
| long length)</pre> |
| <div class="block">NLineInputFormat uses LineRecordReader, which always reads |
| (and consumes) at least one character out of its upper split |
| boundary. So to make sure that each mapper gets N lines, we |
| move back the upper split limits of each split |
| by one character here.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>fileName</code> - Path of file</dd> |
| <dd><code>begin</code> - the position of the first byte in the file to process</dd> |
| <dd><code>length</code> - number of bytes in InputSplit</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>FileSplit</dd> |
| </dl> |
| </li> |
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