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Posted to dev@hive.apache.org by "Gopal V (JIRA)" <ji...@apache.org> on 2014/05/31 21:19:01 UTC

[jira] [Resolved] (HIVE-7151) NULL keys should not be shuffled for inner equi joins

     [ https://issues.apache.org/jira/browse/HIVE-7151?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gopal V resolved HIVE-7151.
---------------------------

    Resolution: Duplicate

Closing this as a duplicate of [~rhbutani]'s patch

> NULL keys should not be shuffled for inner equi joins
> -----------------------------------------------------
>
>                 Key: HIVE-7151
>                 URL: https://issues.apache.org/jira/browse/HIVE-7151
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 0.14.0
>            Reporter: Gopal V
>
> There is a huge skew in reducer load for NULL keys in shuffle joins, resulting in one slow reducer out of many.
> The NULL keys will not contribute towards the inner JOIN condition for equality (unless using null-safes).



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