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https://issues.apache.org/jira/browse/HIVE-9391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jimmy Xiang resolved HIVE-9391.
-------------------------------
Resolution: Invalid
Chatted with Xuefu. This setting doesn't mean to use just 1 reducer. Closed it.
> Spark doesn't obey setting hive.multigroupby.singlereducer
> ----------------------------------------------------------
>
> Key: HIVE-9391
> URL: https://issues.apache.org/jira/browse/HIVE-9391
> Project: Hive
> Issue Type: Bug
> Reporter: Jimmy Xiang
> Priority: Minor
> Fix For: spark-branch
>
>
> With hive.multigroupby.singlereducer set to true, Spark still generates plan
> with multiple groupby reducers. For example, in working on HIVE-9378, I
> found, for test groupby_complex_types_multi_single_reducer.q, we have plan
> like
> {noformat}
> + Reducer 2 <- Map 6 (GROUP, 2)
> + Reducer 4 <- Map 7 (GROUP, 2)
> {noformat}
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