Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16295 )

Change subject: IMPALA-10052: Expose daemon health endpoint for statestore and 
catalog
......................................................................

IMPALA-10052: Expose daemon health endpoint for statestore and catalog

This change exposes the daemon health of statestored and catalogd via
an HTTP endpoint '/healthz'. If the server is healthy, this endpoint
will return HTTP code 200 (OK). If it is unhealthy, it will return
503 (Service Unavailable). This is consistent with the endpoint added
for impalads in IMPALA-8895.

Testing:
- Extended test in test_web_pages.py

Change-Id: I7714734df8e50dabbbebcb77a86a5a00bd13bf7c
Reviewed-on: http://gerrit.cloudera.org:8080/16295
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M be/src/catalog/catalog-server.cc
M be/src/catalog/catalog-server.h
M be/src/catalog/catalogd-main.cc
M be/src/statestore/statestore.cc
M be/src/statestore/statestore.h
M tests/webserver/test_web_pages.py
6 files changed, 64 insertions(+), 6 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I7714734df8e50dabbbebcb77a86a5a00bd13bf7c
Gerrit-Change-Number: 16295
Gerrit-PatchSet: 5
Gerrit-Owner: Bikramjeet Vig <[email protected]>
Gerrit-Reviewer: Abhishek Rawat <[email protected]>
Gerrit-Reviewer: Andrew Sherman <[email protected]>
Gerrit-Reviewer: Bikramjeet Vig <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Joe McDonnell <[email protected]>

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