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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-797) mappers should report life in ways other than emitting data
Date Wed, 26 Aug 2009 04:52:59 GMT

    [ https://issues.apache.org/jira/browse/HIVE-797?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12747776#action_12747776

Zheng Shao commented on HIVE-797:

Mapper script can write to stderr to avoid the killing.

Alternatively, you can do the following to achieve the same result:

set hive.script.auto.progress=true;

> mappers should report life in ways other than emitting data
> -----------------------------------------------------------
>                 Key: HIVE-797
>                 URL: https://issues.apache.org/jira/browse/HIVE-797
>             Project: Hadoop Hive
>          Issue Type: Bug
>            Reporter: S. Alex Smith
> Mappers which are performing a great deal of aggregation can be killed by time out even
if they are running successfully.  For example, in the following query the group by operator
stops the mapper from returning any rows of data until the map is entirely finished.  If the
data processing takes longer than the time-out limit, the job will fail.  The mapper should
instead offer the tracker some indication that it is busy working.  Alternatively, the tracker
could ping the mapper with an appropriate question / warning before it sends a kill signal.
> FROM (
>   FROM my_table
>   USING 'my_boolean_function'
>   AS boolean_output) a
> SELECT boolean_output, COUNT(1)
> GROUP BY boolean_output

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