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Posted to issues-all@impala.apache.org by "Tim Armstrong (Jira)" <ji...@apache.org> on 2019/09/23 21:35:00 UTC
[jira] [Created] (IMPALA-8964) Increase runtime filter wait timeout
for mt_dop
Tim Armstrong created IMPALA-8964:
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Summary: Increase runtime filter wait timeout for mt_dop
Key: IMPALA-8964
URL: https://issues.apache.org/jira/browse/IMPALA-8964
Project: IMPALA
Issue Type: Sub-task
Components: Distributed Exec
Reporter: Tim Armstrong
When we enable joins for multithreaded plans, we should adjust the runtime filter wait time.
A large part of the motivation for the timeout was to allow parallelism between the different sides of the join - there was some concern that having a scan block indefinitely would effectively reduce the amount of parallelism that the plan executed with.
With multithreading, we want to get parallelism across multiple copies of the same fragment, rather than parallelism across different fragments. So this motivation no longer applies. Making the filter wait time unlimited would make query execution more predictable.
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