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Posted to dev@pig.apache.org by "Travis Woodruff (JIRA)" <ji...@apache.org> on 2014/06/09 20:59:02 UTC
[jira] [Updated] (PIG-4001) POPartialAgg aggregates too
aggressively when multiple values aggregated
[ 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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