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Posted to issues@drill.apache.org by "Hanifi Gunes (JIRA)" <ji...@apache.org> on 2014/11/11 03:38:33 UTC

[jira] [Updated] (DRILL-1682) Avoid using UnionExchange for read workloads

     [ https://issues.apache.org/jira/browse/DRILL-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hanifi Gunes updated DRILL-1682:
--------------------------------
    Summary: Avoid using UnionExchange for read workloads  (was: Do not use UnionExchange for read workloads)

> 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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