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| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Interface Summary table, listing interfaces, and an explanation"> |
| <caption><span>Interface Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Interface</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</a><K,V></td> |
| <td class="colLast"> |
| <div class="block"><code>InputFormat</code> describes the input-specification for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</a></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/InputSplitWithLocationInfo.html" title="interface in org.apache.hadoop.mapred">InputSplitWithLocationInfo</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobConfigurable.html" title="interface in org.apache.hadoop.mapred">JobConfigurable</a></td> |
| <td class="colLast"> |
| <div class="block">That what may be configured.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobContext.html" title="interface in org.apache.hadoop.mapred">JobContext</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred">Mapper</a><K1,V1,K2,V2></td> |
| <td class="colLast"> |
| <div class="block">Maps input key/value pairs to a set of intermediate key/value pairs.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred">MapRunnable</a><K1,V1,K2,V2></td> |
| <td class="colLast"> |
| <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="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/OutputCollector.html" title="interface in org.apache.hadoop.mapred">OutputCollector</a><K,V></td> |
| <td class="colLast"> |
| <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="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/OutputFormat.html" title="interface in org.apache.hadoop.mapred">OutputFormat</a><K,V></td> |
| <td class="colLast"> |
| <div class="block"><code>OutputFormat</code> describes the output-specification for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Partitioner.html" title="interface in org.apache.hadoop.mapred">Partitioner</a><K2,V2></td> |
| <td class="colLast"> |
| <div class="block">Partitions the key space.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</a><K,V></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/RecordWriter.html" title="interface in org.apache.hadoop.mapred">RecordWriter</a><K,V></td> |
| <td class="colLast"> |
| <div class="block"><code>RecordWriter</code> writes the output <key, value> pairs |
| to an output file.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred">Reducer</a><K2,V2,K3,V3></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</a></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/RunningJob.html" title="interface in org.apache.hadoop.mapred">RunningJob</a></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/TaskAttemptContext.html" title="interface in org.apache.hadoop.mapred">TaskAttemptContext</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| <li class="blockList"> |
| <table class="typeSummary" border="0" cellpadding="3" cellspacing="0" summary="Class Summary table, listing classes, and an explanation"> |
| <caption><span>Class Summary</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/ClusterStatus.html" title="class in org.apache.hadoop.mapred">ClusterStatus</a></td> |
| <td class="colLast"> |
| <div class="block">Status information on the current state of the Map-Reduce cluster.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Counters.html" title="class in org.apache.hadoop.mapred">Counters</a></td> |
| <td class="colLast"> |
| <div class="block">A set of named counters.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Counters.Counter.html" title="class in org.apache.hadoop.mapred">Counters.Counter</a></td> |
| <td class="colLast"> |
| <div class="block">A counter record, comprising its name and value.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/Counters.Group.html" title="class in org.apache.hadoop.mapred">Counters.Group</a></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</a><K,V></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/FileOutputCommitter.html" title="class in org.apache.hadoop.mapred">FileOutputCommitter</a></td> |
| <td class="colLast"> |
| <div class="block">An <a href="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred"><code>OutputCommitter</code></a> that commits files specified |
| in job output directory i.e.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/FileOutputFormat.html" title="class in org.apache.hadoop.mapred">FileOutputFormat</a><K,V></td> |
| <td class="colLast"> |
| <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="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/FileSplit.html" title="class in org.apache.hadoop.mapred">FileSplit</a></td> |
| <td class="colLast"> |
| <div class="block">A section of an input file.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/FixedLengthInputFormat.html" title="class in org.apache.hadoop.mapred">FixedLengthInputFormat</a></td> |
| <td class="colLast"> |
| <div class="block">FixedLengthInputFormat is an input format used to read input files |
| which contain fixed length records.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/ID.html" title="class in org.apache.hadoop.mapred">ID</a></td> |
| <td class="colLast"> |
| <div class="block">A general identifier, which internally stores the id |
| as an integer.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred">JobClient</a></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</a></td> |
| <td class="colLast"> |
| <div class="block">A map/reduce job configuration.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobID.html" title="class in org.apache.hadoop.mapred">JobID</a></td> |
| <td class="colLast"> |
| <div class="block">JobID represents the immutable and unique identifier for |
| the job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobQueueInfo.html" title="class in org.apache.hadoop.mapred">JobQueueInfo</a></td> |
| <td class="colLast"> |
| <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="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/JobStatus.html" title="class in org.apache.hadoop.mapred">JobStatus</a></td> |
| <td class="colLast"> |
| <div class="block">Describes the current status of a job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html" title="class in org.apache.hadoop.mapred">KeyValueLineRecordReader</a></td> |
| <td class="colLast"> |
| <div class="block">This class treats a line in the input as a key/value pair separated by a |
| separator character.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/KeyValueTextInputFormat.html" title="class in org.apache.hadoop.mapred">KeyValueTextInputFormat</a></td> |
| <td class="colLast"> |
| <div class="block">An <a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><code>InputFormat</code></a> for plain text files.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MapFileOutputFormat.html" title="class in org.apache.hadoop.mapred">MapFileOutputFormat</a></td> |
| <td class="colLast"> |
| <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/MapFile.html" title="class in org.apache.hadoop.io"><code>MapFile</code></a>s.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MapReduceBase.html" title="class in org.apache.hadoop.mapred">MapReduceBase</a></td> |
| <td class="colLast"> |
| <div class="block">Base class for <a href="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><code>Mapper</code></a> and <a href="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><code>Reducer</code></a> implementations.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MapRunner.html" title="class in org.apache.hadoop.mapred">MapRunner</a><K1,V1,K2,V2></td> |
| <td class="colLast"> |
| <div class="block">Default <a href="../../../../org/apache/hadoop/mapred/MapRunnable.html" title="interface in org.apache.hadoop.mapred"><code>MapRunnable</code></a> implementation.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred">MultiFileInputFormat</a><K,V></td> |
| <td class="colLast"> |
| <div class="block">An abstract <a href="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><code>InputFormat</code></a> that returns <a href="../../../../org/apache/hadoop/mapred/MultiFileSplit.html" title="class in org.apache.hadoop.mapred"><code>MultiFileSplit</code></a>'s |
| in <a href="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html#getSplits-org.apache.hadoop.mapred.JobConf-int-"><code>MultiFileInputFormat.getSplits(JobConf, int)</code></a> method.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/MultiFileSplit.html" title="class in org.apache.hadoop.mapred">MultiFileSplit</a></td> |
| <td class="colLast"> |
| <div class="block">A sub-collection of input files.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/OutputCommitter.html" title="class in org.apache.hadoop.mapred">OutputCommitter</a></td> |
| <td class="colLast"> |
| <div class="block"><code>OutputCommitter</code> describes the commit of task output for a |
| Map-Reduce job.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/OutputLogFilter.html" title="class in org.apache.hadoop.mapred">OutputLogFilter</a></td> |
| <td class="colLast"> |
| <div class="block">This class filters log files from directory given |
| It doesnt accept paths having _logs.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat</a></td> |
| <td class="colLast"> |
| <div class="block">InputFormat reading keys, values from SequenceFiles in binary (raw) |
| format.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryOutputFormat</a></td> |
| <td class="colLast"> |
| <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 keys, values to |
| <a href="../../../../org/apache/hadoop/io/SequenceFile.html" title="class in org.apache.hadoop.io"><code>SequenceFile</code></a>s in binary(raw) format</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileAsTextInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextInputFormat</a></td> |
| <td class="colLast"> |
| <div class="block">This class is similar to SequenceFileInputFormat, |
| except it generates SequenceFileAsTextRecordReader |
| which converts the input keys and values to their |
| String forms by calling toString() method.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileAsTextRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextRecordReader</a></td> |
| <td class="colLast"> |
| <div class="block">This class converts the input keys and values to their String forms by calling toString() |
| method.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter</a><K,V></td> |
| <td class="colLast"> |
| <div class="block">A class that allows a map/red job to work on a sample of sequence files.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFormat</a><K,V></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileOutputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileOutputFormat</a><K,V></td> |
| <td class="colLast"> |
| <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="colFirst"><a href="../../../../org/apache/hadoop/mapred/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileRecordReader</a><K,V></td> |
| <td class="colLast"> |
| <div class="block">An <a href="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><code>RecordReader</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="colFirst"><a href="../../../../org/apache/hadoop/mapred/SkipBadRecords.html" title="class in org.apache.hadoop.mapred">SkipBadRecords</a></td> |
| <td class="colLast"> |
| <div class="block">Utility class for skip bad records functionality.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/SplitLocationInfo.html" title="class in org.apache.hadoop.mapred">SplitLocationInfo</a></td> |
| <td class="colLast"> </td> |
| </tr> |
| <tr class="altColor"> |
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| <div class="block">TaskAttemptID represents the immutable and unique identifier for |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/TaskCompletionEvent.html" title="class in org.apache.hadoop.mapred">TaskCompletionEvent</a></td> |
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| job tracker.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/TaskID.html" title="class in org.apache.hadoop.mapred">TaskID</a></td> |
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| <div class="block">TaskID represents the immutable and unique identifier for |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/TaskReport.html" title="class in org.apache.hadoop.mapred">TaskReport</a></td> |
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| <td class="colFirst"><a href="../../../../org/apache/hadoop/mapred/InvalidInputException.html" title="class in org.apache.hadoop.mapred">InvalidInputException</a></td> |
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| <div class="block">This class wraps a list of problems with the input, so that the user |
| can get a list of problems together instead of finding and fixing them one |
| by one.</div> |
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| <div class="block">This exception is thrown when jobconf misses some mendatory attributes |
| or value of some attributes is invalid.</div> |
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