org.apache.hadoop.chukwa.datacollection.writer
Class SocketTeeWriter
java.lang.Object
org.apache.hadoop.chukwa.datacollection.writer.SocketTeeWriter
- All Implemented Interfaces:
- ChukwaWriter, PipelineableWriter
public class SocketTeeWriter
- extends Object
- implements PipelineableWriter
Effectively a "Tee" in the writer pipeline.
Accepts incoming connections on port specified by chukwaCollector.tee.port.
Defaults to 9094
Protocol is as follows:
Client ---> TeeWriter "RAW | WRITABLE "
as per DumpChunks.
TeeWriter ---> Client "OK\n"
In RAW mode
TeeWriter ---> Client (length(int) byte[length])*
An indefinite sequence of length, followed by byte array.
In Writable mode
TeeWriter ---> Client (Chunk serialized as Writable)*
An indefinite sequence of serialized chunks
In English: clients should connect and say either "RAW " or "WRITABLE "
followed by a filter. (Note that the keyword is followed by exactly one space.)
They'll then receive either a sequence of byte arrays or of writable-serialized.
Option chukwaCollector.tee.keepalive controls using TCP keepalive. Defaults to true.
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
WRITABLE
public static final String WRITABLE
- See Also:
- Constant Field Values
RAW
public static final String RAW
- See Also:
- Constant Field Values
SocketTeeWriter
public SocketTeeWriter()
setNextStage
public void setNextStage(ChukwaWriter next)
- Specified by:
setNextStage
in interface PipelineableWriter
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:
-
- 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
Copyright © ${year} The Apache Software Foundation