Dimitris Tsirogiannis has uploaded a new patch set (#4).

Change subject: IMPALA-4041: Limit catalog and admission control updates to 
coordinators
......................................................................

IMPALA-4041: Limit catalog and admission control updates to coordinators

With this commit we add the ability to limit catalog updates to a
limited set of coordinator nodes. A new startup option, termed
'is_coordinator' is added to indicate if a node is a coordinator.
Coordinators accept connections through HS2 and Beeswax interfaces
and can also participate in query execution. Non-coordinator nodes
do not receive catalog updates from the statestore, do not initialize
a query scheduler and cannot accept Beeswax and HS2 client connections.

Testing:
- Added a custom cluster test that launches a cluster in which the
number of coordinators is less than the cluster size and runs a number
of smoke queries.
- Successfully run exhaustive tests.

Change-Id: I5f2c74abdbcd60ac050efa323616bd41182ceff3
---
M be/src/runtime/exec-env.cc
M be/src/runtime/exec-env.h
M be/src/scheduling/admission-controller.cc
M be/src/scheduling/admission-controller.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 be/src/service/impala-server.h
M be/src/service/impalad-main.cc
M be/src/service/query-exec-state.cc
M be/src/testutil/in-process-servers.h
M bin/start-impala-cluster.py
M tests/common/custom_cluster_test_suite.py
M tests/common/impala_service.py
A tests/custom_cluster/test_coordinators.py
16 files changed, 365 insertions(+), 198 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/44/6344/4
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5f2c74abdbcd60ac050efa323616bd41182ceff3
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Dimitris Tsirogiannis <dtsirogian...@cloudera.com>
Gerrit-Reviewer: Dimitris Tsirogiannis <dtsirogian...@cloudera.com>
Gerrit-Reviewer: Henry Robinson <he...@cloudera.com>
Gerrit-Reviewer: Marcel Kornacker <mar...@cloudera.com>
Gerrit-Reviewer: Matthew Jacobs <m...@cloudera.com>

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