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From "Laljo John Pullokkaran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12508) HiveAggregateJoinTransposeRule places a heavy load on the metadata system
Date Tue, 24 Nov 2015 22:31:11 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15025581#comment-15025581
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Laljo John Pullokkaran commented on HIVE-12508:
-----------------------------------------------

Can we run in to CALCITE-794 with HIVE-12503 patch?
My understanding is CALCITE-794 is not an issue with meta data systems itself rather its an
issue when rule fires repeatedly on the same node.


> HiveAggregateJoinTransposeRule places a heavy load on the metadata system
> -------------------------------------------------------------------------
>
>                 Key: HIVE-12508
>                 URL: https://issues.apache.org/jira/browse/HIVE-12508
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO
>    Affects Versions: 2.0.0
>            Reporter: Jesus Camacho Rodriguez
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-12508.patch
>
>
> Finding out whether the input is already unique requires a call to areColumnsUnique that
currently (until CALCITE-794 is fixed) places a heavy load on the metadata system. This can
lead to long CBO planning.
> This is a temporary fix that avoid the call to the method till then.



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