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From "Vikram Dixit K (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-7302) Allow Auto-reducer parallelism to be turned off by a logical optimizer
Date Fri, 27 Jun 2014 20:24:24 GMT

    [ https://issues.apache.org/jira/browse/HIVE-7302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14046355#comment-14046355
] 

Vikram Dixit K commented on HIVE-7302:
--------------------------------------

Left a minor comment on the jira which can be fixed at commit time. LGTM +1.

> Allow Auto-reducer parallelism to be turned off by a logical optimizer
> ----------------------------------------------------------------------
>
>                 Key: HIVE-7302
>                 URL: https://issues.apache.org/jira/browse/HIVE-7302
>             Project: Hive
>          Issue Type: Bug
>          Components: Tez
>    Affects Versions: 0.14.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-7302.1.patch
>
>
> Auto reducer parallelism cannot be used for cases where a custom routing VertexManager
is used.
> Allow a tri-state for ReduceSinkDesc::isAutoParallel to allow "allow, disable, unset"
mechanics.
> The state machine for this setting will now be 
> Allowed transitions
> unset -> allow
> unset -> disable
> allow -> disable
> with no transition case for
> disable -> allow.



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