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From "Tim Armstrong (Code Review)" <>
Subject [Impala-ASF-CR] PREVIEW: IMPALA-4703: reservation denial debug action
Date Tue, 06 Jun 2017 17:34:37 GMT
Tim Armstrong has uploaded a new patch set (#2).

Change subject: PREVIEW: IMPALA-4703: reservation denial debug action

PREVIEW: IMPALA-4703: reservation denial debug action

This is a preview because it depends on the buffer pool execution patch
and I want to get input on the design and scope.

Add debug action to deny reservation increases with some probability.
This allows us to test various scenarios, particularly:
* The case when the node only gets its initial reservation and must
  run to completion without increasing its reservation.
* The case when there is some memory pressure and the node sometimes
  gets a reservation increase and sometimes doesn't.

E.g. to deny all reservation requests after an ExecNode has opened:


This was applied to test_spilling. It caught a bug in the PAGG
with spilling string aggregations.

This required some minor extensions to the debug actions.
* Allow debug actions that apply to all ExecNodes if node_id is -1.
* Allow passing parameters to debug actions. The current grammar of the
  actions is not well-oriented towards extension, so I resorted to using
  @ as a new delimiter.

I also optimised ExecDebugAction() so that it is much faster in the
common case and extended --disable_mem_pools to prevent the buffer pool
from holding onto unused buffers.

Change-Id: Ied39bb091b12156e5dc61b528c6c0cd8de3fe657
M be/src/exec/
M be/src/exec/exec-node.h
M be/src/exec/
M be/src/runtime/bufferpool/
M be/src/runtime/bufferpool/
M be/src/runtime/bufferpool/buffer-pool.h
M be/src/runtime/bufferpool/
M be/src/runtime/bufferpool/reservation-tracker.h
M be/src/runtime/
M be/src/runtime/
M be/src/runtime/debug-options.h
M common/thrift/ImpalaInternalService.thrift
M common/thrift/PlanNodes.thrift
M tests/query_test/
14 files changed, 149 insertions(+), 38 deletions(-)

  git pull ssh:// refs/changes/22/7022/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Ied39bb091b12156e5dc61b528c6c0cd8de3fe657
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Tim Armstrong <>

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