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From "Vineet Garg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22045) HIVE-21711 introduced regression in data load
Date Tue, 30 Jul 2019 18:34:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896393#comment-16896393
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Vineet Garg commented on HIVE-22045:
------------------------------------

bq. Is that going to be another perf regression?
I suppose not. Due to {{isBlobStorage}} LOAD data regressed significantly but it helped CTAS/CM
statements, now with this patch behavior for CTAS/CM should be same as with {{isBlobStorage}}.

bq. The FileSinkDesc:isCTas* method needs more docs in the declaration.
Upload patch which should address this.

> HIVE-21711 introduced regression in data load
> ---------------------------------------------
>
>                 Key: HIVE-22045
>                 URL: https://issues.apache.org/jira/browse/HIVE-22045
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 4.0.0
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>            Priority: Major
>         Attachments: HIVE-22045.1.patch, HIVE-22045.2.patch, HIVE-22045.3.patch, HIVE-22045.4.patch
>
>
> Better fix for HIVE-21711 is to specialize the handling for CTAS/Create MV statements
to avoid intermittent rename operation but keep INSERT etc statements do intermittent rename
since otherwise final move by file operation is significantly slow for such statements.



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