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From Harsh J <ha...@cloudera.com>
Subject Re: Mapreduce program reports child error
Date Tue, 03 May 2011 08:55:09 GMT
Apart from what Arun said, if this happens immediately upon launch, it
could even be a trivial mistake in mapred.child.java.opts parameters
(bad heap size, wrong formatting, etc.). The stderr logs of the task
usually has more information (you can even check the TT's logs).

On Tue, May 3, 2011 at 12:36 PM, Sudharsan Sampath
<sudharsan.sampath@ericsson.com> wrote:
>
> Hi,
>
> Could anyone point me to a summary on why this error would occur?
>
> java.lang.Throwable: Child Error
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:471)
> Caused by: java.io.IOException: Task process exit with nonzero status of 1.
> at org.apache.hadoop.mapred.TaskRunner.run(TaskRunner.java:458)
>
> I know of the following two reasons.
>
> 1) Insufficient space in the logs directory
> 2) ulimit threshold that causes insuffucient allocation of memory.
>
> Thanks
> Sudharsan S
>
>
>



-- 
Harsh J

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