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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-16154) Determine when dynamic runtime filtering should be disabled
Date Fri, 24 Mar 2017 08:26:42 GMT

    [ https://issues.apache.org/jira/browse/HIVE-16154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15939993#comment-15939993
] 

Lefty Leverenz commented on HIVE-16154:
---------------------------------------

Doc note:  This adds *hive.tez.dynamic.semijoin.reduction.threshold* to HiveConf.java, so
it needs to be documented in the wiki.

* [Configuration Properties -- Tez | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-Tez]

Added a TODOC2.2 label.

> Determine when dynamic runtime filtering should be disabled
> -----------------------------------------------------------
>
>                 Key: HIVE-16154
>                 URL: https://issues.apache.org/jira/browse/HIVE-16154
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Planning
>            Reporter: Jason Dere
>            Assignee: Jason Dere
>              Labels: TODOC2.2
>             Fix For: 2.2.0
>
>         Attachments: HIVE-16154.1.patch, HIVE-16154.2.patch, HIVE-16154.3.patch, HIVE-16154.4.patch
>
>
> Currently dynamic min/max/bloom optimization is always enabled. However there are times
where it may not be beneficial, such as if the semijoin has a PK-FK relation and there are
no filters on the semijoin table. Try to devise a way to do a cost/benefit calculation to
see if there is enough benefit to adding the runtime filter.



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