[ http://issues.apache.org/jira/browse/HADOOP-313?page=all ]
Owen O'Malley updated HADOOP-313:
---------------------------------
Attachment: stand-alone-task.patch
This patch does a lot more:
1. It moves the jobId and partition fields from ReduceTask up into Task.
2. It replaces Michel's stand-alone reduce runner, with a more general map
or reduce runner.
3. It adds new task localizations into the job.xml.
For all tasks:
a. map.task.id = the task id
b. mapred.task.is.map = is this a map
c. mapred.task.partition = numeric task id
d. mapred.job.id = job id
For maps:
a. map.input.file = the file that we are reading
b. map.input.start = the offset in the file to start at
c. map.input.length = the number of bytes in the split
For reduces:
a. mapred.map.tasks = correct number of maps
These new attributes allow me to reconstruct the MapTask or ReduceTask
with just the job.xml.
4. A new configuration variable keep.failed.task.files that tells the system
to keep files/directories for tasks that fail. This attribute can be set on a
particular JobConf.
> running a reduce task standalone
> --------------------------------
>
> Key: HADOOP-313
> URL: http://issues.apache.org/jira/browse/HADOOP-313
> Project: Hadoop
> Type: Bug
> Reporter: Michel Tourn
> Assignee: Michel Tourn
> Attachments: sareduce.patch, stand-alone-task.patch
>
> This is a tool to reproduce problems and to run unit tests involving a reduce
> task.
> You just give it a reduce directory on the command line.
> Usage: java org.apache.hadoop.mapred.StandaloneReduceTask <taskdir>
> [<limitmaps>]
> taskdir name encodes: task_<jobid>_r_<partition>_<attempt>
> taskdir contains job.xml and one or more input files named: map_<dddd>.out
> You should run with the same -Xmx option as the TaskTracker child JVM
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