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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-4706) Fragment planning causes Drillbits to read remote chunks when local copies are available
Date Tue, 01 Nov 2016 15:21:58 GMT

    [ https://issues.apache.org/jira/browse/DRILL-4706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625688#comment-15625688
] 

ASF GitHub Bot commented on DRILL-4706:
---------------------------------------

Github user sudheeshkatkam commented on the issue:

    https://github.com/apache/drill/pull/639
  
    @vkorukanti if you don't mind, can you review this?


> Fragment planning causes Drillbits to read remote chunks when local copies are available
> ----------------------------------------------------------------------------------------
>
>                 Key: DRILL-4706
>                 URL: https://issues.apache.org/jira/browse/DRILL-4706
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Query Planning & Optimization
>    Affects Versions: 1.6.0
>         Environment: CentOS, RHEL
>            Reporter: Kunal Khatua
>            Assignee: Sorabh Hamirwasia
>              Labels: performance, planning
>
> When a table (datasize=70GB) of 160 parquet files (each having a single rowgroup and
fitting within one chunk) is available on a 10-node setup with replication=3 ; a pure data
scan query causes about 2% of the data to be read remotely. 
> Even with the creation of metadata cache, the planner is selecting a sub-optimal plan
of executing the SCAN fragments such that some of the data is served from a remote server.




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