[jira] [Assigned] (HIVE-22567) Data loss when map join is off ,the result is diffrent when the number of reduce tasks is diffrent;

["Aditya Shah (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aditya Shah reassigned HIVE-22567:
----------------------------------

    Assignee: Aditya Shah

> 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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