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https://issues.apache.org/jira/browse/IMPALA-13661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Pranav Yogi Lodha updated IMPALA-13661:
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Labels: flaky (was: )
> Support parallelism above JDBC tables for joins/aggregates
> ----------------------------------------------------------
>
> Key: IMPALA-13661
> URL: https://issues.apache.org/jira/browse/IMPALA-13661
> Project: IMPALA
> Issue Type: Sub-task
> Components: Frontend
> Reporter: Wenzhe Zhou
> Assignee: Pranav Yogi Lodha
> Priority: Major
> Labels: flaky
>
> Currently Impala planer generate single node plan with one scanner thread for
> query accessing JDBC tables since table stats are not available for JDBC
> tables.
> Even the JDBC fetching has to be single-threaded but we could use exchange or
> row batch threading to parallelize multiple JDBC connections. This will
> improve the performance significantly.
> We need to change the planer to create multiple scanner threads for query
> which access multiple jdbc tables with joins or aggregations.
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