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

java.lang.Object
  extended by org.apache.hadoop.mapreduce.RecordReader<K,V>
      extended by org.apache.hadoop.mapreduce.lib.input.SequenceFileRecordReader<K,V>
All Implemented Interfaces:
Closeable

@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileRecordReader<K,V>
extends RecordReader<K,V>

An RecordReader for SequenceFiles.


Field Summary
protected  Configuration conf
           
 
Constructor Summary
SequenceFileRecordReader()
           
 
Method Summary
 void close()
          Close the record reader.
 K getCurrentKey()
          Get the current key
 V getCurrentValue()
          Get the current value.
 float getProgress()
          Return the progress within the input split
 void initialize(InputSplit split, TaskAttemptContext context)
          Called once at initialization.
 boolean nextKeyValue()
          Read the next key, value pair.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

conf

protected Configuration conf
Constructor Detail

SequenceFileRecordReader

public SequenceFileRecordReader()
Method Detail

initialize

public void initialize(InputSplit split,
                       TaskAttemptContext context)
                throws IOException,
                       InterruptedException
Description copied from class: RecordReader
Called once at initialization.

Specified by:
initialize in class RecordReader<K,V>
Parameters:
split - the split that defines the range of records to read
context - the information about the task
Throws:
IOException
InterruptedException

nextKeyValue

public boolean nextKeyValue()
                     throws IOException,
                            InterruptedException
Description copied from class: RecordReader
Read the next key, value pair.

Specified by:
nextKeyValue in class RecordReader<K,V>
Returns:
true if a key/value pair was read
Throws:
IOException
InterruptedException

getCurrentKey

public K getCurrentKey()
Description copied from class: RecordReader
Get the current key

Specified by:
getCurrentKey in class RecordReader<K,V>
Returns:
the current key or null if there is no current key

getCurrentValue

public V getCurrentValue()
Description copied from class: RecordReader
Get the current value.

Specified by:
getCurrentValue in class RecordReader<K,V>
Returns:
the object that was read

getProgress

public float getProgress()
                  throws IOException
Return the progress within the input split

Specified by:
getProgress in class RecordReader<K,V>
Returns:
0.0 to 1.0 of the input byte range
Throws:
IOException

close

public void close()
           throws IOException
Description copied from class: RecordReader
Close the record reader.

Specified by:
close in interface Closeable
Specified by:
close in class RecordReader<K,V>
Throws:
IOException


Copyright © 2013 Apache Software Foundation. All Rights Reserved.