You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@drill.apache.org by "Arina Ielchiieva (JIRA)" <ji...@apache.org> on 2019/08/02 15:00:00 UTC
[jira] [Assigned] (DRILL-4706) Fragment planning causes Drillbits
to read remote chunks when local copies are available
[ https://issues.apache.org/jira/browse/DRILL-4706?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arina Ielchiieva reassigned DRILL-4706:
---------------------------------------
Assignee: (was: Padma Penumarthy)
> 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
> 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.
--
This message was sent by Atlassian JIRA
(v7.6.14#76016)