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## org.apache.hadoop.mapred
Class SequenceFileInputFilter<K,V>

    java.lang.Object
      org.apache.hadoop.mapred.FileInputFormat<K,V>
          org.apache.hadoop.mapred.SequenceFileInputFormat<K,V>
              org.apache.hadoop.mapred.SequenceFileInputFilter<K,V>

All Implemented Interfaces:
  InputFormat<K,V>

    public class SequenceFileInputFilter<K,V>

extends SequenceFileInputFormat<K,V>

A class that allows a map/red job to work on a sample of sequence files. The sample is decided by the filter class set by the job.

Nested Class Summary
`static interface` | `SequenceFileInputFilter.Filter` filter interface
`static class` | `SequenceFileInputFilter.FilterBase` base class for Filters
`static class` | `SequenceFileInputFilter.MD5Filter` This class returns a set of records by examing the MD5 digest of its key against a filtering frequency f.
`static class` | `SequenceFileInputFilter.PercentFilter` This class returns a percentage of records The percentage is determined by a filtering frequency f using the criteria record# % f == 0.
`static class` | `SequenceFileInputFilter.RegexFilter` Records filter by matching key to regex

Nested classes/interfaces inherited from class org.apache.hadoop.mapred.FileInputFormat
`FileInputFormat.Counter`

Field Summary

Fields inherited from class org.apache.hadoop.mapred.FileInputFormat
`LOG`

Constructor Summary
`SequenceFileInputFilter()`

Method Summary
`RecordReader<K,V>` | `getRecordReader(InputSplit split, JobConf job, Reporter reporter)` Create a record reader for the given split
`static void` | `setFilterClass(Configuration conf, Class filterClass)` set the filter class

Methods inherited from class org.apache.hadoop.mapred.SequenceFileInputFormat
`listStatus`

Methods inherited from class org.apache.hadoop.mapred.FileInputFormat
`addInputPath, addInputPaths, computeSplitSize, getBlockIndex, getInputPathFilter, getInputPaths, getSplitHosts, getSplits, isSplitable, setInputPathFilter, setInputPaths, setInputPaths, setMinSplitSize`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### SequenceFileInputFilter

    public SequenceFileInputFilter()

Method Detail

### getRecordReader

    public RecordReader<K,V> getRecordReader(InputSplit split,
                                             JobConf job,
                                             Reporter reporter)
                                      throws IOException

  Create a record reader for the given split

  Specified by:
    `getRecordReader` in interface `InputFormat<K,V>`
  Overrides:
    `getRecordReader` in class `SequenceFileInputFormat<K,V>`
  Parameters:
    `split` - file split
    `job` - job configuration
    `reporter` - reporter who sends report to task tracker
  Returns:
    RecordReader
  Throws:
    `IOException`

### setFilterClass

    public static void setFilterClass(Configuration conf,
                                      Class filterClass)

  set the filter class

  Parameters:
    `conf` - application configuration
    `filterClass` - filter class

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Copyright © 2009 The Apache Software Foundation