org.apache.hadoop.chukwa.datacollection.writer

Class SeqFileWriter

java.lang.Object

org.apache.hadoop.chukwa.datacollection.writer.PipelineableWriter

org.apache.hadoop.chukwa.datacollection.writer.SeqFileWriter

All Implemented Interfaces:

ChukwaWriter

Direct Known Subclasses:

FilePerPostWriter

public class SeqFileWriter
extends PipelineableWriter
implements ChukwaWriter

This class is thread-safe -- rotate() and save() both synchronize on this object.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	SeqFileWriter.StatReportingTask

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	FIXED_INTERVAL_OFFSET_OPT
static String	IF_FIXED_INTERVAL_OPT
String	localHostAddr
static String	OUTPUT_DIR_OPT
static String	ROTATE_INTERVAL_OPT
static String	STAT_PERIOD_OPT

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

COMMIT_FAIL, COMMIT_OK

Constructor Summary

Constructors

Constructor and Description
SeqFileWriter()

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.
long	getBytesWritten()
void	init(org.apache.hadoop.conf.Configuration conf) Called once to initialize this writer.
static void	setEnableRotationOnClose(boolean b)

Methods inherited from class org.apache.hadoop.chukwa.datacollection.writer.PipelineableWriter

setNextStage

Methods inherited from class java.lang.Object

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

Field Detail

STAT_PERIOD_OPT

public static final String STAT_PERIOD_OPT

See Also:

Constant Field Values

ROTATE_INTERVAL_OPT

public static final String ROTATE_INTERVAL_OPT

See Also:

Constant Field Values

IF_FIXED_INTERVAL_OPT

public static final String IF_FIXED_INTERVAL_OPT

See Also:

Constant Field Values

FIXED_INTERVAL_OFFSET_OPT

public static final String FIXED_INTERVAL_OFFSET_OPT

See Also:

Constant Field Values

OUTPUT_DIR_OPT

public static final String OUTPUT_DIR_OPT

See Also:

Constant Field Values

localHostAddr

public String localHostAddr

Constructor Detail

SeqFileWriter

public SeqFileWriter()

Method Detail

getBytesWritten

public long getBytesWritten()

init

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

Description copied from interface: ChukwaWriter

Called once to initialize this writer.

Specified by:

init in interface ChukwaWriter

Parameters:

conf - is Chukwa configuration

Throws:

WriterException - if error writing data

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

Overrides:

add in class PipelineableWriter

Parameters:

chunks - is a list of data to send

Returns:

CommitStatus

Throws:

WriterException - if error writing data

close

public void close()

Description copied from interface: ChukwaWriter

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

Specified by:

close in interface ChukwaWriter

setEnableRotationOnClose

public static void setEnableRotationOnClose(boolean b)