org.apache.hadoop.chukwa.datacollection.writer

Class NullWriter

java.lang.Object

org.apache.hadoop.chukwa.datacollection.writer.NullWriter

All Implemented Interfaces:

ChukwaWriter

public class NullWriter
extends Object
implements ChukwaWriter

Minimal writer; does nothing with data. Useful primarily as an end-of-pipeline stage, if stuff in the middle is accomplishing something useful.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.chukwa.datacollection.writer.ChukwaWriter

ChukwaWriter.COMMIT_PENDING, ChukwaWriter.CommitStatus

Field Summary

Fields

Modifier and Type	Field and Description
static String	RATE_OPT_NAME

Fields inherited from interface org.apache.hadoop.chukwa.datacollection.writer.ChukwaWriter

COMMIT_FAIL, COMMIT_OK

Constructor Summary

Constructors

Constructor and Description
NullWriter()

Method Summary

Modifier and Type	Method and Description
ChukwaWriter.CommitStatus	add(List<Chunk> chunks) Called repeatedly with data that should be serialized.
void	close() Called once, indicating that the writer should close files and prepare to exit.
void	init(org.apache.hadoop.conf.Configuration c) Called once to initialize this writer.

Methods inherited from class java.lang.Object

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

Field Detail

RATE_OPT_NAME

public static final String RATE_OPT_NAME

See Also:

Constant Field Values

Constructor Detail

NullWriter

public NullWriter()

Method Detail

add

public ChukwaWriter.CommitStatus add(List<Chunk> chunks)
                              throws WriterException

Description copied from interface: ChukwaWriter

Called repeatedly with data that should be serialized. Subclasses may assume that init() will be called before any calls to add(), and that add() won't be called after close().

Specified by:

add in interface ChukwaWriter

Returns:

CommitStatus

Throws:

WriterException

close

public void close()
           throws WriterException

Description copied from interface: ChukwaWriter

Called once, indicating that the writer should close files and prepare to exit.

Specified by:

close in interface ChukwaWriter

Throws:

WriterException

init

public void init(org.apache.hadoop.conf.Configuration c)
          throws WriterException

Description copied from interface: ChukwaWriter

Called once to initialize this writer.

Specified by:

init in interface ChukwaWriter

Throws:

WriterException