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https://issues.apache.org/jira/browse/HIVE-22567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16991518#comment-16991518
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Aditya Shah commented on HIVE-22567:
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[~zero_never] can you please attach explain plans for the query. Moreover, I
faced a similar issue in 3.1.2 (HIVE-22561). Can you please check if the patch
for HIVE-20187 makes things work fine?
> Data loss when map join is off ,the result is diffrent when the number of
> reduce tasks is diffrent;
> ---------------------------------------------------------------------------------------------------
>
> Key: HIVE-22567
> URL: https://issues.apache.org/jira/browse/HIVE-22567
> Project: Hive
> Issue Type: Bug
> Affects Versions: 3.1.1, 3.1.2
> Environment: select count(1) from (
> select department_code
> from tmp.tmp_mon
> where business_unit_code in (select business_unit_code from
> tmp.business_unit_config)
> group by department_code
> )tmp
> Reporter: Zhang Xiaoyang
> Assignee: Aditya Shah
> Priority: Blocker
>
> I get diffrent results when the map join is off and the reduce tasks is
> diffrent !
> the tmp.tmp_mon is a big table and tmp.business_unit_config has only 7
> records;
> when set hive.auto.convert.join=false,the result is diffrent when the number
> of the reduce tasks changed;
> set mapred.reduce.tasks=1 the result seems right and when set
> mapred.reduce.tasks=2 or other,the result is missing some data;
> what can cause this ?
>
>
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