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https://issues.apache.org/jira/browse/IMPALA-6035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16514047#comment-16514047
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Tim Armstrong commented on IMPALA-6035:
---------------------------------------
commit d8ed07f11227257254682fff3b62de8834291d66
Author: Tim Armstrong <[email protected]>
Date: Thu May 31 16:25:26 2018 -0700
IMPALA-6035: Add query options to limit thread reservation
Adds two options: THREAD_RESERVATION_LIMIT and
THREAD_RESERVATION_AGGREGATE_LIMIT, which are both enforced by admission
control based on planner resource requirements and the schedule. The
mechanism used is the same as the minimum reservation checks.
THREAD_RESERVATION_LIMIT limits the total number of reserved threads in
fragments scheduled on a single backend.
THREAD_RESERVATION_AGGREGATE_LIMIT limits the sum of reserved threads
across all fragments.
This also slightly improves the minimum reservation error message to
include the host name.
Testing:
Added end-to-end tests that exercise the code paths.
Ran core tests.
Change-Id: I5b5bbbdad5cd6b24442eb6c99a4d38c2ad710007
Reviewed-on: http://gerrit.cloudera.org:8080/10365
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> Add query option that rejects queries based on query complexity
> ---------------------------------------------------------------
>
> Key: IMPALA-6035
> URL: https://issues.apache.org/jira/browse/IMPALA-6035
> Project: IMPALA
> Issue Type: Sub-task
> Components: Distributed Exec
> Reporter: Mostafa Mokhtar
> Assignee: Tim Armstrong
> Priority: Major
> Labels: admission-control
> Fix For: Impala 2.13.0, Impala 3.1.0
>
>
> Expose query option to reject queries with a large number of remote
> fragments.
> Queries with a large number of fragments can negatively affect cluster
> behavior.
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