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| <h1 title="Uses of Package org.apache.hadoop.mapred" class="title">Uses of Package<br>org.apache.hadoop.mapred</h1> |
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| <th class="colFirst" scope="col">Package</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><a href="#org.apache.hadoop.mapred">org.apache.hadoop.mapred</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapred.jobcontrol">org.apache.hadoop.mapred.jobcontrol</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapred.join">org.apache.hadoop.mapred.join</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapred.lib.db">org.apache.hadoop.mapred.lib.db</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapred.nativetask">org.apache.hadoop.mapred.nativetask</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapred.pipes">org.apache.hadoop.mapred.pipes</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce</a></td> |
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| <td class="colFirst"><a href="#org.apache.hadoop.mapreduce.lib.input">org.apache.hadoop.mapreduce.lib.input</a></td> |
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| <caption><span>Classes in <a href="../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</a> used by <a href="../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</a></span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Class and Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/ClusterStatus.html#org.apache.hadoop.mapred">ClusterStatus</a> |
| <div class="block">Status information on the current state of the Map-Reduce cluster.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Counters.html#org.apache.hadoop.mapred">Counters</a> |
| <div class="block">A set of named counters.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Counters.Counter.html#org.apache.hadoop.mapred">Counters.Counter</a> |
| <div class="block">A counter record, comprising its name and value.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Counters.Group.html#org.apache.hadoop.mapred">Counters.Group</a> |
| <div class="block"><code>Group</code> of counters, comprising of counters from a particular |
| counter <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang"><code>Enum</code></a> class.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/FileInputFormat.html#org.apache.hadoop.mapred">FileInputFormat</a> |
| <div class="block">A base class for file-based <a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><code>InputFormat</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/FileOutputFormat.html#org.apache.hadoop.mapred">FileOutputFormat</a> |
| <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> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/FileSplit.html#org.apache.hadoop.mapred">FileSplit</a> |
| <div class="block">A section of an input file.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InputFormat.html#org.apache.hadoop.mapred">InputFormat</a> |
| <div class="block"><code>InputFormat</code> describes the input-specification for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InputSplit.html#org.apache.hadoop.mapred">InputSplit</a> |
| <div class="block"><code>InputSplit</code> represents the data to be processed by an |
| individual <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InputSplitWithLocationInfo.html#org.apache.hadoop.mapred">InputSplitWithLocationInfo</a> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InvalidJobConfException.html#org.apache.hadoop.mapred">InvalidJobConfException</a> |
| <div class="block">This exception is thrown when jobconf misses some mendatory attributes |
| or value of some attributes is invalid.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobConf.html#org.apache.hadoop.mapred">JobConf</a> |
| <div class="block">A map/reduce job configuration.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobConfigurable.html#org.apache.hadoop.mapred">JobConfigurable</a> |
| <div class="block">That what may be configured.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobContext.html#org.apache.hadoop.mapred">JobContext</a> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobID.html#org.apache.hadoop.mapred">JobID</a> |
| <div class="block">JobID represents the immutable and unique identifier for |
| the job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobPriority.html#org.apache.hadoop.mapred">JobPriority</a> |
| <div class="block">Used to describe the priority of the running job.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobQueueInfo.html#org.apache.hadoop.mapred">JobQueueInfo</a> |
| <div class="block">Class that contains the information regarding the Job Queues which are |
| maintained by the Hadoop Map/Reduce framework.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobStatus.html#org.apache.hadoop.mapred">JobStatus</a> |
| <div class="block">Describes the current status of a job.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Mapper.html#org.apache.hadoop.mapred">Mapper</a> |
| <div class="block">Maps input key/value pairs to a set of intermediate key/value pairs.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/MapRunnable.html#org.apache.hadoop.mapred">MapRunnable</a> |
| <div class="block">Expert: Generic interface for <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a>s.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/OutputCollector.html#org.apache.hadoop.mapred">OutputCollector</a> |
| <div class="block">Collects the <code><key, value></code> pairs output by <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a>s |
| and <a href="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><code>Reducer</code></a>s.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/OutputCommitter.html#org.apache.hadoop.mapred">OutputCommitter</a> |
| <div class="block"><code>OutputCommitter</code> describes the commit of task output for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/OutputFormat.html#org.apache.hadoop.mapred">OutputFormat</a> |
| <div class="block"><code>OutputFormat</code> describes the output-specification for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Partitioner.html#org.apache.hadoop.mapred">Partitioner</a> |
| <div class="block">Partitions the key space.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/RecordReader.html#org.apache.hadoop.mapred">RecordReader</a> |
| <div class="block"><code>RecordReader</code> reads <key, value> pairs from an |
| <a href="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/RecordWriter.html#org.apache.hadoop.mapred">RecordWriter</a> |
| <div class="block"><code>RecordWriter</code> writes the output <key, value> pairs |
| to an output file.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Reducer.html#org.apache.hadoop.mapred">Reducer</a> |
| <div class="block">Reduces a set of intermediate values which share a key to a smaller set of |
| values.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Reporter.html#org.apache.hadoop.mapred">Reporter</a> |
| <div class="block">A facility for Map-Reduce applications to report progress and update |
| counters, status information etc.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/RunningJob.html#org.apache.hadoop.mapred">RunningJob</a> |
| <div class="block"><code>RunningJob</code> is the user-interface to query for details on a |
| running Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/SequenceFileInputFormat.html#org.apache.hadoop.mapred">SequenceFileInputFormat</a> |
| <div class="block">An <a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><code>InputFormat</code></a> for <a href="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><code>SequenceFile</code></a>s.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/SequenceFileOutputFormat.html#org.apache.hadoop.mapred">SequenceFileOutputFormat</a> |
| <div class="block">An <a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred"><code>OutputFormat</code></a> that writes <a href="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><code>SequenceFile</code></a>s.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/SplitLocationInfo.html#org.apache.hadoop.mapred">SplitLocationInfo</a> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskAttemptContext.html#org.apache.hadoop.mapred">TaskAttemptContext</a> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskAttemptID.html#org.apache.hadoop.mapred">TaskAttemptID</a> |
| <div class="block">TaskAttemptID represents the immutable and unique identifier for |
| a task attempt.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskCompletionEvent.html#org.apache.hadoop.mapred">TaskCompletionEvent</a> |
| <div class="block">This is used to track task completion events on |
| job tracker.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskCompletionEvent.Status.html#org.apache.hadoop.mapred">TaskCompletionEvent.Status</a> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskID.html#org.apache.hadoop.mapred">TaskID</a> |
| <div class="block">TaskID represents the immutable and unique identifier for |
| a Map or Reduce Task.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/TaskReport.html#org.apache.hadoop.mapred">TaskReport</a> |
| <div class="block">A report on the state of a task.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"><a name="org.apache.hadoop.mapred.jobcontrol"> |
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| <caption><span>Classes in <a href="../../../../org/apache/hadoop/mapred/package-summary.html">org.apache.hadoop.mapred</a> used by <a href="../../../../org/apache/hadoop/mapred/jobcontrol/package-summary.html">org.apache.hadoop.mapred.jobcontrol</a></span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Class and Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobClient.html#org.apache.hadoop.mapred.jobcontrol">JobClient</a> |
| <div class="block"><code>JobClient</code> is the primary interface for the user-job to interact |
| with the cluster.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobConf.html#org.apache.hadoop.mapred.jobcontrol">JobConf</a> |
| <div class="block">A map/reduce job configuration.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobID.html#org.apache.hadoop.mapred.jobcontrol">JobID</a> |
| <div class="block">JobID represents the immutable and unique identifier for |
| the job.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"><a name="org.apache.hadoop.mapred.join"> |
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| <tr> |
| <th class="colOne" scope="col">Class and Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InputFormat.html#org.apache.hadoop.mapred.join">InputFormat</a> |
| <div class="block"><code>InputFormat</code> describes the input-specification for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/InputSplit.html#org.apache.hadoop.mapred.join">InputSplit</a> |
| <div class="block"><code>InputSplit</code> represents the data to be processed by an |
| individual <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/JobConf.html#org.apache.hadoop.mapred.join">JobConf</a> |
| <div class="block">A map/reduce job configuration.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/RecordReader.html#org.apache.hadoop.mapred.join">RecordReader</a> |
| <div class="block"><code>RecordReader</code> reads <key, value> pairs from an |
| <a href="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><code>InputSplit</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Reporter.html#org.apache.hadoop.mapred.join">Reporter</a> |
| <div class="block">A facility for Map-Reduce applications to report progress and update |
| counters, status information etc.</div> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"><a name="org.apache.hadoop.mapred.lib"> |
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| <tr> |
| <th class="colOne" scope="col">Class and Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/FileInputFormat.html#org.apache.hadoop.mapred.lib">FileInputFormat</a> |
| <div class="block">A base class for file-based <a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><code>InputFormat</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
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| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/OutputFormat.html#org.apache.hadoop.mapred.lib">OutputFormat</a> |
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| <td class="colOne"><a href="../../../../org/apache/hadoop/mapred/class-use/Reporter.html#org.apache.hadoop.mapred.lib">Reporter</a> |
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