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

java.lang.Object
  extended by org.apache.hadoop.mapreduce.InputFormat<K,V>
      extended by org.apache.hadoop.mapreduce.lib.input.FileInputFormat<K,V>
          extended by org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat<K,V>
Direct Known Subclasses:
SequenceFileAsBinaryInputFormat, SequenceFileAsTextInputFormat, SequenceFileInputFilter

@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileInputFormat<K,V>
extends FileInputFormat<K,V>

An InputFormat for SequenceFiles.


Field Summary
 
Fields inherited from class org.apache.hadoop.mapreduce.lib.input.FileInputFormat
INPUT_DIR, NUM_INPUT_FILES, PATHFILTER_CLASS, SPLIT_MAXSIZE, SPLIT_MINSIZE
 
Constructor Summary
SequenceFileInputFormat()
           
 
Method Summary
 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  List<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, makeSplit, 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 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:
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 List<FileStatus> listStatus(JobContext job)
                               throws 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:
IOException - if zero items.


Copyright © 2012 Apache Software Foundation. All Rights Reserved.