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Posted to issues@drill.apache.org by "Arina Ielchiieva (Jira)" <ji...@apache.org> on 2019/11/04 12:49:00 UTC
[jira] [Updated] (DRILL-7141) Hash-Join (and Agg) should always
spill to disk the least used partition
[ https://issues.apache.org/jira/browse/DRILL-7141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arina Ielchiieva updated DRILL-7141:
------------------------------------
Fix Version/s: (was: 1.17.0)
> Hash-Join (and Agg) should always spill to disk the least used partition
> ------------------------------------------------------------------------
>
> Key: DRILL-7141
> URL: https://issues.apache.org/jira/browse/DRILL-7141
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.15.0
> Reporter: Kunal Khatua
> Assignee: Boaz Ben-Zvi
> Priority: Major
>
> When the probe-side data for a hash join is skewed, it is preferable to have the corresponding partition on the build side to be in memory.
> Currently, with the spill-to-disk feature, the partition selected for spilling to disk is done at random. This means that a highly skewed probe-side data would also spill for lack of a corresponding hash table partition in memory.
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