org.apache.hadoop.mapreduce.lib.input

Class SequenceFileInputFormat<K,V>

java.lang.Object

org.apache.hadoop.mapreduce.InputFormat<K,V>

org.apache.hadoop.mapreduce.lib.input.FileInputFormat<K,V>

org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat<K,V>

Direct Known Subclasses:

SequenceFileAsBinaryInputFormat, SequenceFileAsTextInputFormat, SequenceFileInputFilter

public class SequenceFileInputFormat<K,V>
extends FileInputFormat<K,V>

An InputFormat for SequenceFiles.

Constructor Summary

Constructors

Constructor and Description
SequenceFileInputFormat()

Method Summary

Methods

Modifier and Type	Method and Description
RecordReader<K,V>	createRecordReader(InputSplit split, TaskAttemptContext context) Create a record reader for a given split.
protected long	getFormatMinSplitSize() Get the lower bound on split size imposed by the format.
protected java.util.List<org.apache.hadoop.fs.FileStatus>	listStatus(JobContext job) List input directories.

Methods inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat

addInputPath, addInputPaths, computeSplitSize, getBlockIndex, getInputPathFilter, getInputPaths, getMaxSplitSize, getMinSplitSize, getSplits, isSplitable, setInputPathFilter, setInputPaths, setInputPaths, setMaxInputSplitSize, setMinInputSplitSize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SequenceFileInputFormat

public SequenceFileInputFormat()

Method Detail

createRecordReader

public RecordReader<K,V> createRecordReader(InputSplit split,
                                   TaskAttemptContext context)
                                     throws java.io.IOException

Description copied from class: InputFormat

Create a record reader for a given split. The framework will call RecordReader.initialize(InputSplit, TaskAttemptContext) before the split is used.

Specified by:

createRecordReader in class InputFormat<K,V>

Parameters:

split - the split to be read

context - the information about the task

Returns:

a new record reader

Throws:

java.io.IOException

getFormatMinSplitSize

protected long getFormatMinSplitSize()

Description copied from class: FileInputFormat

Get the lower bound on split size imposed by the format.

Overrides:

getFormatMinSplitSize in class FileInputFormat<K,V>

Returns:

the number of bytes of the minimal split for this format

listStatus

protected java.util.List<org.apache.hadoop.fs.FileStatus> listStatus(JobContext job)
                                                              throws java.io.IOException

Description copied from class: FileInputFormat

List input directories. Subclasses may override to, e.g., select only files matching a regular expression.

Overrides:

listStatus in class FileInputFormat<K,V>

Parameters:

job - the job to list input paths for

Returns:

array of FileStatus objects

Throws:

java.io.IOException - if zero items.