org.apache.hadoop.chukwa.datacollection.adaptor.filetailer

Class CharFileTailingAdaptorUTF8

java.lang.Object

org.apache.hadoop.chukwa.datacollection.adaptor.AbstractAdaptor

org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.LWFTAdaptor

org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.FileTailingAdaptor

org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.CharFileTailingAdaptorUTF8

All Implemented Interfaces:

Adaptor

public class CharFileTailingAdaptorUTF8
extends FileTailingAdaptor

A subclass of FileTailingAdaptor that reads UTF8/ascii files and splits records at carriage returns.

Field Summary

Fields inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.FileTailingAdaptor

GRACEFUL_PERIOD, MAX_RETRIES, reader

Fields inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.LWFTAdaptor

conf, DEFAULT_MAX_READ_SIZE, fileReadOffset, MAX_READ_SIZE, MAX_READ_SIZE_OPT, offsetOfFirstByte, tailer

Fields inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.AbstractAdaptor

adaptorID, control, dest, type

Constructor Summary

Constructors

Constructor and Description
CharFileTailingAdaptorUTF8()

Method Summary

Methods

Modifier and Type	Method and Description
protected int	extractRecords(ChunkReceiver eq, long buffOffsetInFile, byte[] buf) Note: this method uses a temporary ArrayList (shared across instances).

Methods inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.FileTailingAdaptor

shutdown, start, tailFile

Methods inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.filetailer.LWFTAdaptor

getCurrentStatus, getStreamName, parseArgs, slurp, toString

Methods inherited from class org.apache.hadoop.chukwa.datacollection.adaptor.AbstractAdaptor

deregisterAndStop, getType, hardStop, parseArgs, shutdown, start

Methods inherited from class java.lang.Object

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

Constructor Detail

CharFileTailingAdaptorUTF8

public CharFileTailingAdaptorUTF8()

Method Detail

extractRecords

protected int extractRecords(ChunkReceiver eq,
                 long buffOffsetInFile,
                 byte[] buf)
                      throws InterruptedException

Note: this method uses a temporary ArrayList (shared across instances). This means we're copying ints each time. This could be a performance issue. Also, 'offsets' never shrinks, and will be of size proportional to the largest number of lines ever seen in an event.

Overrides:

extractRecords in class LWFTAdaptor

Parameters:

eq - the queue to stick the new chunk[s] in

buffOffsetInFile - the byte offset in the stream at which buf[] begins

buf - the byte buffer to extract records from

Returns:

the number of bytes processed

Throws:

InterruptedException