Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/16459 )

Change subject: IMPALA-10170: Data race on Webserver::UrlHandler::is_on_nav_bar_
......................................................................

IMPALA-10170: Data race on Webserver::UrlHandler::is_on_nav_bar_

This data race can be reproduced by
TestCompactCatalogUpdates.test_restart_catalogd, although it does not
seem to always occur. The data race was originally reported in a Jenkins
job, but I could not reproduce it locally.

The fix is to acquire a read lock while reading some UrlHandler objects.
I cleaned up some of the other involved variables and made them const.
These variables are set during construction time, and never modified
afterwards.

Testing:
* Ran be and custom cluster TSAN tests

Change-Id: I6923af4754e3fe72b8b04c5303a1e7a79da7613a
Reviewed-on: http://gerrit.cloudera.org:8080/16459
Reviewed-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
---
M be/src/util/webserver.cc
M be/src/util/webserver.h
2 files changed, 15 insertions(+), 12 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: I6923af4754e3fe72b8b04c5303a1e7a79da7613a
Gerrit-Change-Number: 16459
Gerrit-PatchSet: 7
Gerrit-Owner: Sahil Takiar <stak...@cloudera.com>
Gerrit-Reviewer: Impala Public Jenkins <impala-public-jenk...@cloudera.com>
Gerrit-Reviewer: Sahil Takiar <stak...@cloudera.com>
Gerrit-Reviewer: Tim Armstrong <tarmstr...@cloudera.com>
Gerrit-Reviewer: Wenzhe Zhou <wz...@cloudera.com>

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