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From "Pranay Singh (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5142 EventSequence displays negative elapsed time.
Date Wed, 01 Nov 2017 22:24:41 GMT
Hello Dan Hecht, 

I'd like you to reexamine a change. Please visit

to look at the new patch set (#5).

Change subject: IMPALA-5142 EventSequence displays negative elapsed time.

IMPALA-5142 EventSequence displays negative elapsed time.

EventSequence::EventList which stores the Event in increasing time
order may have at times Events that are not stored in increasing time
order. This may happen when concurrently EventSequence::MarkEvent()
is called for different Events in the same EventSequence.

The incorrect time order of Event in EventList results in a negative
value being displayed, which is the issue reported in this JIRA.

The issue can be fixed either be re-ordering the lock in
EventSequence::MarkEvent() or by sorting the EventList before
printing. Reordering of lock in EventSequence::MarkEvent() will
involve holding the lock across clock_gettime() so that
approach is not taken. This patch fixes the issue by sorting the
EventList in GetEvents() as this function is expected to return
sorted list of events based on time.

Ran all the front-end/backend and end-end tests.

Change-Id: I8c944396d96473b17b453da3e913ffc56680a896
M be/src/util/runtime-profile-counters.h
1 file changed, 14 insertions(+), 0 deletions(-)

  git pull ssh:// refs/changes/15/8215/5
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I8c944396d96473b17b453da3e913ffc56680a896
Gerrit-Change-Number: 8215
Gerrit-PatchSet: 5
Gerrit-Owner: Pranay Singh
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Pranay Singh

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