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| <h2 title="Class FileOutputFormat" class="title">Class FileOutputFormat<K,V></h2> |
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| <li>org.apache.hadoop.mapred.FileOutputFormat<K,V></li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</a><K,V></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../org/apache/hadoop/mapred/MapFileOutputFormat.html" title="class in org.apache.hadoop.mapred">MapFileOutputFormat</a>, <a href="../../../../org/apache/hadoop/mapred/lib/MultipleOutputFormat.html" title="class in org.apache.hadoop.mapred.lib">MultipleOutputFormat</a>, <a href="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileOutputFormat</a>, <a href="../../../../org/apache/hadoop/mapred/TextOutputFormat.html" title="class in org.apache.hadoop.mapred">TextOutputFormat</a></dd> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public abstract class <span class="typeNameLabel">FileOutputFormat<K,V></span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</a><K,V></pre> |
| <div class="block">A base class for <a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><code>OutputFormat</code></a>.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#FileOutputFormat--">FileOutputFormat</a></span>()</code> </td> |
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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/FileOutputFormat.html#checkOutputSpecs-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-">checkOutputSpecs</a></span>(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> ignored, |
| <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job)</code> |
| <div class="block">Check for validity of the output-specification for the job.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getCompressOutput-org.apache.hadoop.mapred.JobConf-">getCompressOutput</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</code> |
| <div class="block">Is the job output compressed?</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getOutputCompressorClass-org.apache.hadoop.mapred.JobConf-java.lang.Class-">getOutputCompressorClass</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>> defaultValue)</code> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> for compressing the job outputs.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getOutputPath-org.apache.hadoop.mapred.JobConf-">getOutputPath</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</code> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the output directory for the map-reduce job.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getPathForCustomFile-org.apache.hadoop.mapred.JobConf-java.lang.String-">getPathForCustomFile</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name)</code> |
| <div class="block">Helper function to generate a <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> for a file that is unique for |
| the task within the job output directory.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter</a><<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">K</a>,<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">V</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getRecordWriter-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-java.lang.String-org.apache.hadoop.util.Progressable-">getRecordWriter</a></span>(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> ignored, |
| <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <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> name, |
| <a href="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</a> progress)</code> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><code>RecordWriter</code></a> for the given job.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getTaskOutputPath-org.apache.hadoop.mapred.JobConf-java.lang.String-">getTaskOutputPath</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name)</code> |
| <div class="block">Helper function to create the task's temporary output directory and |
| return the path to the task's output file.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code>static <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></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getUniqueName-org.apache.hadoop.mapred.JobConf-java.lang.String-">getUniqueName</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name)</code> |
| <div class="block">Helper function to generate a name that is unique for the task.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getWorkOutputPath-org.apache.hadoop.mapred.JobConf-">getWorkOutputPath</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</code> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the task's temporary output directory |
| for the map-reduce job |
| |
| <b id="SideEffectFiles">Tasks' Side-Effect Files</b></div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#setCompressOutput-org.apache.hadoop.mapred.JobConf-boolean-">setCompressOutput</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| boolean compress)</code> |
| <div class="block">Set whether the output of the job is compressed.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#setOutputCompressorClass-org.apache.hadoop.mapred.JobConf-java.lang.Class-">setOutputCompressorClass</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>> codecClass)</code> |
| <div class="block">Set the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> to be used to compress job outputs.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#setOutputPath-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.fs.Path-">setOutputPath</a></span>(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> outputDir)</code> |
| <div class="block">Set the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> of the output directory for the map-reduce job.</div> |
| </td> |
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| </a> |
| <h3>Constructor Detail</h3> |
| <a name="FileOutputFormat--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>FileOutputFormat</h4> |
| <pre>public FileOutputFormat()</pre> |
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| <a name="setCompressOutput-org.apache.hadoop.mapred.JobConf-boolean-"> |
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| <h4>setCompressOutput</h4> |
| <pre>public static void setCompressOutput(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| boolean compress)</pre> |
| <div class="block">Set whether the output of the job is compressed.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a> to modify</dd> |
| <dd><code>compress</code> - should the output of the job be compressed?</dd> |
| </dl> |
| </li> |
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| <a name="getCompressOutput-org.apache.hadoop.mapred.JobConf-"> |
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| <h4>getCompressOutput</h4> |
| <pre>public static boolean getCompressOutput(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</pre> |
| <div class="block">Is the job output compressed?</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a> to look in</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd><code>true</code> if the job output should be compressed, |
| <code>false</code> otherwise</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>setOutputCompressorClass</h4> |
| <pre>public static void setOutputCompressorClass(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>> codecClass)</pre> |
| <div class="block">Set the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> to be used to compress job outputs.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a> to modify</dd> |
| <dd><code>codecClass</code> - the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> to be used to |
| compress the job outputs</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getOutputCompressorClass-org.apache.hadoop.mapred.JobConf-java.lang.Class-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getOutputCompressorClass</h4> |
| <pre>public static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>> getOutputCompressorClass(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</a><? extends <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress">CompressionCodec</a>> defaultValue)</pre> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> for compressing the job outputs.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred"><code>JobConf</code></a> to look in</dd> |
| <dd><code>defaultValue</code> - the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> to return if not set</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the <a href="../../../../org/apache/hadoop/io/compress/CompressionCodec.html" title="interface in org.apache.hadoop.io.compress"><code>CompressionCodec</code></a> to be used to compress the |
| job outputs</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if the class was specified, but not found</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getRecordWriter-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-java.lang.String-org.apache.hadoop.util.Progressable-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getRecordWriter</h4> |
| <pre>public abstract <a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter</a><<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">K</a>,<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">V</a>> getRecordWriter(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> ignored, |
| <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job, |
| <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> name, |
| <a href="../../../../org/apache/hadoop/util/Progressable.html" title="interface in org.apache.hadoop.util">Progressable</a> progress) |
| 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/OutputFormat.html#getRecordWriter-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-java.lang.String-org.apache.hadoop.util.Progressable-">OutputFormat</a></code></span></div> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><code>RecordWriter</code></a> for the given job.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html#getRecordWriter-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-java.lang.String-org.apache.hadoop.util.Progressable-">getRecordWriter</a></code> in interface <code><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</a><<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">K</a>,<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">V</a>></code></dd> |
| <dd><code>job</code> - configuration for the job whose output is being written.</dd> |
| <dd><code>name</code> - the unique name for this part of the output.</dd> |
| <dd><code>progress</code> - mechanism for reporting progress while writing to file.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a <a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred"><code>RecordWriter</code></a> to write the output 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> |
| </dl> |
| </li> |
| </ul> |
| <a name="checkOutputSpecs-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>checkOutputSpecs</h4> |
| <pre>public void checkOutputSpecs(<a href="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs">FileSystem</a> ignored, |
| <a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> job) |
| throws <a href="../../../../org/apache/hadoop/mapred/FileAlreadyExistsException.html" title="class in org.apache.hadoop.mapred">FileAlreadyExistsException</a>, |
| <a href="../../../../org/apache/hadoop/mapred/InvalidJobConfException.html" title="class in org.apache.hadoop.mapred">InvalidJobConfException</a>, |
| <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/OutputFormat.html#checkOutputSpecs-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-">OutputFormat</a></code></span></div> |
| <div class="block">Check for validity of the output-specification for the job. |
| |
| <p>This is to validate the output specification for the job when it is |
| a job is submitted. Typically checks that it does not already exist, |
| throwing an exception when it already exists, so that output is not |
| overwritten.</p> |
| |
| Implementations which write to filesystems which support delegation |
| tokens usually collect the tokens for the destination path(s) |
| and attach them to the job configuration.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html#checkOutputSpecs-org.apache.hadoop.fs.FileSystem-org.apache.hadoop.mapred.JobConf-">checkOutputSpecs</a></code> in interface <code><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</a><<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">K</a>,<a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="type parameter in FileOutputFormat">V</a>></code></dd> |
| <dd><code>job</code> - job configuration.</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 output should not be attempted</dd> |
| <dd><code><a href="../../../../org/apache/hadoop/mapred/FileAlreadyExistsException.html" title="class in org.apache.hadoop.mapred">FileAlreadyExistsException</a></code></dd> |
| <dd><code><a href="../../../../org/apache/hadoop/mapred/InvalidJobConfException.html" title="class in org.apache.hadoop.mapred">InvalidJobConfException</a></code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setOutputPath-org.apache.hadoop.mapred.JobConf-org.apache.hadoop.fs.Path-"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>setOutputPath</h4> |
| <pre>public static void setOutputPath(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> outputDir)</pre> |
| <div class="block">Set the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> of the output directory for the map-reduce job.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - The configuration of the job.</dd> |
| <dd><code>outputDir</code> - the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> of the output directory for |
| the map-reduce job.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getOutputPath-org.apache.hadoop.mapred.JobConf-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getOutputPath</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> getOutputPath(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</pre> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the output directory for the map-reduce job.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the output directory for the map-reduce job.</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getWorkOutputPath-org.apache.hadoop.mapred.JobConf-"><code>getWorkOutputPath(JobConf)</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getWorkOutputPath-org.apache.hadoop.mapred.JobConf-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getWorkOutputPath</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> getWorkOutputPath(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf)</pre> |
| <div class="block">Get the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the task's temporary output directory |
| for the map-reduce job |
| |
| <b id="SideEffectFiles">Tasks' Side-Effect Files</b> |
| |
| <p><i>Note:</i> The following is valid only if the <a href="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred"><code>OutputCommitter</code></a> |
| is <a href="../../../../org/apache/hadoop/mapred/FileOutputCommitter.html" title="class in org.apache.hadoop.mapred"><code>FileOutputCommitter</code></a>. If <code>OutputCommitter</code> is not |
| a <code>FileOutputCommitter</code>, the task's temporary output |
| directory is same as <a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getOutputPath-org.apache.hadoop.mapred.JobConf-"><code>getOutputPath(JobConf)</code></a> i.e. |
| <tt>${mapreduce.output.fileoutputformat.outputdir}$</tt></p> |
| |
| <p>Some applications need to create/write-to side-files, which differ from |
| the actual job-outputs. |
| |
| <p>In such cases there could be issues with 2 instances of the same TIP |
| (running simultaneously e.g. speculative tasks) trying to open/write-to the |
| same file (path) on HDFS. Hence the application-writer will have to pick |
| unique names per task-attempt (e.g. using the attemptid, say |
| <tt>attempt_200709221812_0001_m_000000_0</tt>), not just per TIP.</p> |
| |
| <p>To get around this the Map-Reduce framework helps the application-writer |
| out by maintaining a special |
| <tt>${mapreduce.output.fileoutputformat.outputdir}/_temporary/_${taskid}</tt> |
| sub-directory for each task-attempt on HDFS where the output of the |
| task-attempt goes. On successful completion of the task-attempt the files |
| in the <tt>${mapreduce.output.fileoutputformat.outputdir}/_temporary/_${taskid}</tt> (only) |
| are <i>promoted</i> to <tt>${mapreduce.output.fileoutputformat.outputdir}</tt>. Of course, the |
| framework discards the sub-directory of unsuccessful task-attempts. This |
| is completely transparent to the application.</p> |
| |
| <p>The application-writer can take advantage of this by creating any |
| side-files required in <tt>${mapreduce.task.output.dir}</tt> during execution |
| of his reduce-task i.e. via <a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getWorkOutputPath-org.apache.hadoop.mapred.JobConf-"><code>getWorkOutputPath(JobConf)</code></a>, and the |
| framework will move them out similarly - thus she doesn't have to pick |
| unique paths per task-attempt.</p> |
| |
| <p><i>Note</i>: the value of <tt>${mapreduce.task.output.dir}</tt> during |
| execution of a particular task-attempt is actually |
| <tt>${mapreduce.output.fileoutputformat.outputdir}/_temporary/_{$taskid}</tt>, and this value is |
| set by the map-reduce framework. So, just create any side-files in the |
| path returned by <a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getWorkOutputPath-org.apache.hadoop.mapred.JobConf-"><code>getWorkOutputPath(JobConf)</code></a> from map/reduce |
| task to take advantage of this feature.</p> |
| |
| <p>The entire discussion holds true for maps of jobs with |
| reducer=NONE (i.e. 0 reduces) since output of the map, in that case, |
| goes directly to HDFS.</p></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> to the task's temporary output directory |
| for the map-reduce job.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getTaskOutputPath-org.apache.hadoop.mapred.JobConf-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTaskOutputPath</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> getTaskOutputPath(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name) |
| 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">Helper function to create the task's temporary output directory and |
| return the path to the task's output file.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - job-configuration</dd> |
| <dd><code>name</code> - temporary task-output filename</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>path to the task's temporary output file</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> |
| <a name="getUniqueName-org.apache.hadoop.mapred.JobConf-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getUniqueName</h4> |
| <pre>public static <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> getUniqueName(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name)</pre> |
| <div class="block">Helper function to generate a name that is unique for the task. |
| |
| <p>The generated name can be used to create custom files from within the |
| different tasks for the job, the names for different tasks will not collide |
| with each other.</p> |
| |
| <p>The given name is postfixed with the task type, 'm' for maps, 'r' for |
| reduces and the task partition number. For example, give a name 'test' |
| running on the first map o the job the generated name will be |
| 'test-m-00000'.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the configuration for the job.</dd> |
| <dd><code>name</code> - the name to make unique.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a unique name accross all tasks of the job.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPathForCustomFile-org.apache.hadoop.mapred.JobConf-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>getPathForCustomFile</h4> |
| <pre>public static <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs">Path</a> getPathForCustomFile(<a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a> conf, |
| <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> name)</pre> |
| <div class="block">Helper function to generate a <a href="../../../../org/apache/hadoop/fs/Path.html" title="class in org.apache.hadoop.fs"><code>Path</code></a> for a file that is unique for |
| the task within the job output directory. |
| |
| <p>The path can be used to create custom files from within the map and |
| reduce tasks. The path name will be unique for each task. The path parent |
| will be the job output directory.</p>ls |
| |
| <p>This method uses the <a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html#getUniqueName-org.apache.hadoop.mapred.JobConf-java.lang.String-"><code>getUniqueName(org.apache.hadoop.mapred.JobConf, java.lang.String)</code></a> method to make the file name |
| unique for the task.</p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - the configuration for the job.</dd> |
| <dd><code>name</code> - the name for the file.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a unique path accross all tasks of the job.</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| </div> |
| <!-- ========= END OF CLASS DATA ========= --> |
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