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https://issues.apache.org/jira/browse/HIVE-30101?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HIVE-30101:
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Labels: pull-request-available (was: )
> Prevent SortedDynPartitionOptimizer from injecting ReduceSink when stats are
> missing
> ------------------------------------------------------------------------------------
>
> Key: HIVE-30101
> URL: https://issues.apache.org/jira/browse/HIVE-30101
> Project: Hive
> Issue Type: Bug
> Reporter: Raghav Aggarwal
> Assignee: Raghav Aggarwal
> Priority: Major
> Labels: pull-request-available
>
> {{hive.optimize.sort.dynamic.partition.threshold}} is set to 0 by default
> making the decision cost based. If the table is lacking stats still this
> config is kicked-in and causing severe performance degradation. If 200
> reducers are getting launched only 4 - 5 of them are doing actual work. This
> is observed in our production environment as well
>
> This is a regression in a way from Hive3 as
> {{hive.optimize.sort.dynamic.partition}} was by-default false and now its
> enable in hive4. For external tables where stats are stale or not present (if
> autogather is false then) it causes performance issue.
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