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https://issues.apache.org/jira/browse/HIVE-797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carl Steinbach resolved HIVE-797.
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Resolution: Invalid
> mappers should report life in ways other than emitting data
> -----------------------------------------------------------
>
> Key: HIVE-797
> URL: https://issues.apache.org/jira/browse/HIVE-797
> Project: 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
> SELECT TRANSFORM(my_data)
> USING 'my_boolean_function'
> AS boolean_output) a
> SELECT boolean_output, COUNT(1)
> GROUP BY boolean_output
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