Marcel Kornacker has posted comments on this change.

Change subject: IMPALA-3902: Scheduler improvements for running multiple 
fragment instances on a single backend
......................................................................


Patch Set 12:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/4054/12/be/src/scheduling/query-schedule.cc
File be/src/scheduling/query-schedule.cc:

PS12, Line 207: request_.query_ctx.request.query_options.mt_dop > 0
> is this condition always equal to the one at line 196?
yes.

this will go away as soon as we stop special-casing the coordinator instance, 
which will happen very soon (because at that point we treat all instances as 
the same; the weird thing is that num_fragment_instances_ is set externally to 
QuerySchedule, and doesn't reflect the coordinator instance; that variable and 
all related code paths will be removed).


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Gerrit-MessageType: comment
Gerrit-Change-Id: I240445199e22f009f4e72fdb8754eb8d77e3d680
Gerrit-PatchSet: 12
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Marcel Kornacker <mar...@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Lars Volker <l...@cloudera.com>
Gerrit-Reviewer: Marcel Kornacker <mar...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <m...@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokh...@cloudera.com>
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