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Posted to issues@impala.apache.org by "Tim Armstrong (JIRA)" <ji...@apache.org> on 2017/07/10 23:48:00 UTC
[jira] [Created] (IMPALA-5644) Fail queries early when their
minimum reservation is too high to execute within the given mem_limit
Tim Armstrong created IMPALA-5644:
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Summary: Fail queries early when their minimum reservation is too high to execute within the given mem_limit
Key: IMPALA-5644
URL: https://issues.apache.org/jira/browse/IMPALA-5644
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Affects Versions: Impala 2.10.0
Reporter: Tim Armstrong
Assignee: Tim Armstrong
With the initial version of IMPALA-3200, we won't check whether the minimum reservation fits within the query memory limit until fragment startup time.
There are a couple of decisions to make here:
* How to deal with the RESERVATION_MEM_FRACTION/RESERVATION_MEM_MIN_REMAINING heuristic that limits reservation relative to the query mem_limit
* Where to actually reject the query
This is a bit tricky since it needs to happen after we've determined the applicable memory limit (which depends on resolving the request pool). Admission control would be one place but admission control can be disabled.
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