Tim Armstrong created IMPALA-7389:
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Summary: Admission control should set aside less memory on
dedicated coordinator if coordinator fragment is lightweight
Key: IMPALA-7389
URL: https://issues.apache.org/jira/browse/IMPALA-7389
Project: IMPALA
Issue Type: Improvement
Components: Distributed Exec
Affects Versions: Impala 2.12.0, Impala 3.0
Reporter: Tim Armstrong
The current admission control treats all backends symmetrically and sets aside
the mem_limit. This makes sense for now given that we have the same mem_limit
setting for all backends.
One case where this could be somewhat problematic is if you have dedicated
coordinators with less memory than the executors, because the coordinator's
process memory limit will be fully admitted before the executors.
If you have multiple coordinators and queries are distributed between them this
is relatively unlikely to become a problem. If you have a single coordinator
this is more of an issue.
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