[Impala-ASF-CR] IMPALA-8469: admit mem limit for dedicated coordinator

["Tim Armstrong (Code Review)" <ge...@cloudera.org>]

Hello Lars Volker, Bikramjeet Vig, 

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

    http://gerrit.cloudera.org:8080/13180

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

Change subject: IMPALA-8469: admit_mem_limit for dedicated coordinator
......................................................................

IMPALA-8469: admit_mem_limit for dedicated coordinator

Refactored to avoid the code duplication that resulted in this bug:
* admit_mem_limit is calculated once in ExecEnv
* The local backend descriptor is always constructed with
  a static helper: Scheduler::BuildLocalBackendDescriptor()

I chose to factor it in this way, in part, to avoid invasive
changes to scheduler-test, which currently doesn't depend on
ExecEnv or ImpalaServer.

Testing:
Added basic test that reproduces the bug.

Change-Id: Iaceb21b753b9b021bedc4187c0d44aaa6a626521
---
M be/src/runtime/exec-env.cc
M be/src/runtime/exec-env.h
M be/src/scheduling/scheduler-test-util.cc
M be/src/scheduling/scheduler.cc
M be/src/scheduling/scheduler.h
M be/src/service/impala-server.cc
M tests/common/custom_cluster_test_suite.py
M tests/custom_cluster/test_admission_controller.py
8 files changed, 102 insertions(+), 55 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/80/13180/5
-- 
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Iaceb21b753b9b021bedc4187c0d44aaa6a626521
Gerrit-Change-Number: 13180
Gerrit-PatchSet: 5
Gerrit-Owner: Tim Armstrong <ta...@cloudera.com>
Gerrit-Reviewer: Bikramjeet Vig <bi...@cloudera.com>
Gerrit-Reviewer: Lars Volker <lv...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <ta...@cloudera.com>