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https://issues.apache.org/jira/browse/DRILL-4667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Boaz Ben-Zvi updated DRILL-4667:
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Fix Version/s: 1.18.0
> Improve memory footprint of broadcast joins
> -------------------------------------------
>
> Key: DRILL-4667
> URL: https://issues.apache.org/jira/browse/DRILL-4667
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Relational Operators
> Affects Versions: 1.6.0
> Reporter: Aman Sinha
> Assignee: Boaz Ben-Zvi
> Priority: Major
> Fix For: 1.18.0
>
>
> For broadcast joins, currently Drill optimizes the data transfer across the
> network for broadcast table by sending a single copy to the receiving node
> which then distributes it to all minor fragments running on that particular
> node. However, each minor fragment builds its own hash table (for a hash
> join) using this broadcast table. We can substantially improve the memory
> footprint by having a shared copy of the hash table among multiple minor
> fragments on a node.
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