org.apache.hadoop.mapred

Class TaskLog.Reader

java.lang.Object

java.io.InputStream

org.apache.hadoop.mapred.TaskLog.Reader

All Implemented Interfaces:

Closeable, AutoCloseable

Enclosing class:

TaskLog

public static class TaskLog.Reader
extends InputStream

Constructor Summary

Constructors

Constructor and Description
Reader(TaskAttemptID taskid, TaskLog.LogName kind, long start, long end, boolean isCleanup) Read a log file from start to end positions.

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
int	read()
int	read(byte[] buffer, int offset, int length)

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

Reader

public Reader(TaskAttemptID taskid,
              TaskLog.LogName kind,
              long start,
              long end,
              boolean isCleanup)
       throws IOException

Read a log file from start to end positions. The offsets may be negative, in which case they are relative to the end of the file. For example, Reader(taskid, kind, 0, -1) is the entire file and Reader(taskid, kind, -4197, -1) is the last 4196 bytes.

Parameters:

taskid - the id of the task to read the log file for

kind - the kind of log to read

start - the offset to read from (negative is relative to tail)

end - the offset to read upto (negative is relative to tail)

isCleanup - whether the attempt is cleanup attempt or not

Throws:

IOException

Method Detail

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] buffer,
                int offset,
                int length)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException