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From "Matthew Jacobs (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5838: Improve errors on AC buffer mem rejection
Date Fri, 25 Aug 2017 20:49:56 GMT
Matthew Jacobs has uploaded a new change for review.

Change subject: IMPALA-5838: Improve errors on AC buffer mem rejection

IMPALA-5838: Improve errors on AC buffer mem rejection

The error message returned when a query is rejected due to
insufficient buffer memory is misleading. It recommended a
mem_limit which would be high enough, but changing the
mem_limit may result in changing the plan, which may result
in further changes to the buffer memory requirement.

In particular, this can happen when the planner compares the
expected hash table size to the mem_limit, and decides to
choose a partitioned join over a broadcast join.

While we might consider other code changes to improve this,
for now lets just be clear in the error message.

* Adds tests that verify the expected behavior with the new
  error message.

Change-Id: I3dc3517195508d86078a8a4b537ae7d2f52fbcb7
M be/src/scheduling/
A testdata/workloads/functional-query/queries/QueryTest/admission-reject-min-reservation.test
M tests/custom_cluster/
3 files changed, 56 insertions(+), 25 deletions(-)

  git pull ssh:// refs/changes/34/7834/1
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I3dc3517195508d86078a8a4b537ae7d2f52fbcb7
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Matthew Jacobs <>

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