Tim Armstrong has uploaded this change for review. ( 
http://gerrit.cloudera.org:8080/12407


Change subject: IMPALA-5043: diagnostics for topic staleness in AC
......................................................................

IMPALA-5043: diagnostics for topic staleness in AC

The default threshold for the admission control topic to be considered
stale is 5s.

Adds diagnostics for stale topic updates:
* A banner on the /admission web UI if the topic is considered stale.
* Time since last update on the /admission web UI
* Append a warning to rejection/queuing messages where topic staleness
  may have affected the decision.
* Append a warning to profiles of admitted queries where the topic was
  stale at the time the query was admitted.
* Include the topic staleness in all profiles of admitted queries

Testing:
Add a custom cluster test that kills the statestore, validates that
admission control behaves as expected and that stateless warnings
show up in the appropriate places.

Change-Id: Ib9e26adb6419589ccf7625e423356df45bee4ac9
---
M be/src/scheduling/admission-controller.cc
M be/src/scheduling/admission-controller.h
M be/src/service/impala-http-handler.cc
M tests/common/impala_test_suite.py
M tests/custom_cluster/test_admission_controller.py
M www/admission_controller.tmpl
6 files changed, 208 insertions(+), 34 deletions(-)



  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/07/12407/3
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: Ib9e26adb6419589ccf7625e423356df45bee4ac9
Gerrit-Change-Number: 12407
Gerrit-PatchSet: 3
Gerrit-Owner: Tim Armstrong <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>

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