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From "Jacques Nadeau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-1682) Avoid using UnionExchange for read workloads
Date Tue, 11 Nov 2014 04:04:33 GMT

    [ https://issues.apache.org/jira/browse/DRILL-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14205916#comment-14205916
] 

Jacques Nadeau commented on DRILL-1682:
---------------------------------------

To expound on this, I think this is primarily important when we're doing smallish read queries
that are being returned to screen.  

> Avoid using UnionExchange for read workloads
> --------------------------------------------
>
>                 Key: DRILL-1682
>                 URL: https://issues.apache.org/jira/browse/DRILL-1682
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>            Reporter: Hanifi Gunes
>            Assignee: Aman Sinha
>
> Use of UnionExchange in read workloads provides minor gains considering the implementation,
maintenance overhead. Importantly it delays query termination as reported at DRILL-1681. Planner
ideally should avoid using it for read queries.



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