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https://issues.apache.org/jira/browse/IMPALA-3902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-3902.
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Resolution: Fixed
Closing because it is now broadly usable for many use cases. There are some
issues that might cause challenges for migration of complex workloads that I
have moved to IMPALA-10486.
> Multi-threaded query execution
> ------------------------------
>
> Key: IMPALA-3902
> URL: https://issues.apache.org/jira/browse/IMPALA-3902
> Project: IMPALA
> Issue Type: Epic
> Components: Backend
> Affects Versions: Impala 2.6.0
> Reporter: Marcel Kinard
> Assignee: Tim Armstrong
> Priority: Minor
> Labels: multithreading
>
> Currently, a single query fragment is run in a quasi-single threaded manner
> on a node: the scanners are run in multiple threads, but all other operators
> (joins, aggregation) are run in the main thread.
> The goal is to add multi-threaded execution on a single node by running
> multiple fragment instances (each of which runs in a single thread).
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