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https://issues.apache.org/jira/browse/DRILL-4706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16504097#comment-16504097
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ASF GitHub Bot commented on DRILL-4706:
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ppadma commented on issue #639: DRILL-4706: Fragment planning causes Drillbits
to read remote chunks when local copies are available.
URL: https://github.com/apache/drill/pull/639#issuecomment-395257273
Even though it is old, this PR is still very much relevant and useful
feature to have in Drill for certain use cases/scenarios.
I request a committer to work with me so we can get it in. Any volunteers ?
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> 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: Padma Penumarthy
> Priority: Major
> 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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