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From "Travis Woodruff (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (PIG-4001) POPartialAgg aggregates too aggressively when multiple values aggregated
Date Mon, 09 Jun 2014 18:59:02 GMT

     [ https://issues.apache.org/jira/browse/PIG-4001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Travis Woodruff updated PIG-4001:
---------------------------------

    Description: 
{{POPartialAgg.aggregateRawRow()}} is counting values in {{numEntriesInTarget}}, but all the
values that {{numEntriesInTarget}} is compared to count tuples.

This is similar to PIG-3649 but has less of a performance impact, as it generally does not
cause map-side aggregation to be disable entirely (since {{aggregateRawRow()}} is unlikely
to be called before {{checkSizeReduction()}}; however, it can cause second-level aggregation
to be run too often.



  was:
{{POPartialAgg.aggregateRawRow()}} is counting values in {{numEntriesInTarget}}, but all the
values that {{numEntriesInTarget}} are compared to count tuples.

This is similar to PIG-3649 but has less of a performance impact, as it generally does not
cause map-side aggregation to be disable entirely (since {{aggregateRawRow()}} is unlikely
to be called before {{checkSizeReduction()}}; however, it can cause second-level aggregation
to be run too often.




> POPartialAgg aggregates too aggressively when multiple values aggregated
> ------------------------------------------------------------------------
>
>                 Key: PIG-4001
>                 URL: https://issues.apache.org/jira/browse/PIG-4001
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: 0.13.0
>            Reporter: Travis Woodruff
>            Assignee: Travis Woodruff
>            Priority: Minor
>
> {{POPartialAgg.aggregateRawRow()}} is counting values in {{numEntriesInTarget}}, but
all the values that {{numEntriesInTarget}} is compared to count tuples.
> This is similar to PIG-3649 but has less of a performance impact, as it generally does
not cause map-side aggregation to be disable entirely (since {{aggregateRawRow()}} is unlikely
to be called before {{checkSizeReduction()}}; however, it can cause second-level aggregation
to be run too often.



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