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https://issues.apache.org/jira/browse/IMPALA-3825?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong reassigned IMPALA-3825:
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Assignee: Abhishek Rawat (was: Rahul Shivu Mahadev)
> Distribute runtime filter aggregation across cluster
> ----------------------------------------------------
>
> Key: IMPALA-3825
> URL: https://issues.apache.org/jira/browse/IMPALA-3825
> Project: IMPALA
> Issue Type: Improvement
> Components: Distributed Exec
> Affects Versions: Impala 2.6.0
> Reporter: Henry Robinson
> Assignee: Abhishek Rawat
> Priority: Major
> Labels: runtime-filters
>
> Runtime filters can be tens of MB or more, and incasting all filters from all
> shuffle joins to the coordinator can put a lot of memory pressure on that
> node. To alleviate this we should consider spreading out the aggregation
> operation across the cluster, so that a different node aggregates each
> runtime filter.
> This still restricts aggregation to #runtime-filters nodes, which will
> usually be less than the cluster size. If we want to smooth that out further
> we could use tree-based aggregation, but let's measure the benefits of simply
> distributing the aggregation work first.
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