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From "Tim Armstrong (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4833: Compute precise per-host reservation size
Date Fri, 11 Aug 2017 07:39:34 GMT
Tim Armstrong has posted comments on this change.

Change subject: IMPALA-4833: Compute precise per-host reservation size

Patch Set 2:

File be/src/runtime/

Line 63:     //const vector<const FInstanceExecParams*>& instance_params_list,
File be/src/scheduling/query-schedule.h:

PS2, Line 55: FInstanceExecParams*
Maybe make it const& since it can't be null?

Line 251:   /// TODO: Replace uses of unique_hosts_ with per_backend_exec_params.
It looks like there are a limited number of callsites, can we just do this cleanup now?
File be/src/scheduling/

Line 688:   // TODO: Move to admission control, it doesn't need to be in the Scheduler.
What if admission control is disabled?

I agree it doesn't seem like it fits in scheduling though.
File common/thrift/ImpalaInternalService.thrift:

Line 484:   // required in V1
> The default is effectively optional:
Yeah this is kind of weird - I get that it makes sense if we have clients speaking different
versions of the protocol but we always assume our Impala daemon versions match afaik. Oh well.
File tests/custom_cluster/

Line 38:     config_map = {'DEFAULT_SPILLABLE_BUFFER_SIZE': '33554432',
The choice of queries, params, etc needs some explanation.

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Gerrit-MessageType: comment
Gerrit-Change-Id: Idbcd1e9b1be14edc4017b4907e83f9d56059fbac
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Matthew Jacobs <>
Gerrit-Reviewer: Matthew Jacobs <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-HasComments: Yes

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