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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18665) LLAP: Ignore cache-affinity if the LLAP IO elevator is disabled
Date Fri, 09 Feb 2018 21:40:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16359014#comment-16359014
] 

Gopal V commented on HIVE-18665:
--------------------------------

Not sure if that ever gets triggered, but it is pretty much a toss-up on whether to force
affinity or not.

> LLAP: Ignore cache-affinity if the LLAP IO elevator is disabled
> ---------------------------------------------------------------
>
>                 Key: HIVE-18665
>                 URL: https://issues.apache.org/jira/browse/HIVE-18665
>             Project: Hive
>          Issue Type: Bug
>          Components: llap
>    Affects Versions: 3.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Major
>         Attachments: HIVE-18665.1.patch
>
>
> SplitLocationProvider removes HDFS locality in LLAP, causing more network traffic when
reading file formats which aren't currently cached.
> In the absence of the IO elevator, cache affinity should be disabled.
> This information is encoded into the MapWork in deriveLlapIoDescString, move this to
an Enum type for comparisons.



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