Hao Hao has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/13657 )

Change subject: [sentry] add require_db_privileges flag for ListTables
......................................................................

[sentry] add require_db_privileges flag for ListTables

This patch adds a sentry_require_db_privileges_for_list_tables flag to
allow enforcing database level privileges for ListTables. Without this
flag, there will be a number of requests to Sentry related to the number
of tables in Kudu. With it, that number is limited to the number of
databases in Kudu. However, note that when the flag is set to true,
users with no database-level privileges on a database will not be able
to see any tables within it.

Using ListTablesBenchmark without the flag:
 $ ./bin/sentry_authz_provider-test --gtest_filter=*ListTablesBench* 
--num_databases=10 --num_tables_per_db=100 --has-db-privileges=false 
--sentry_require_db_privileges_for_list_tables=false

sentry_authz_provider-test.cc:421] Time spent Listing tables: real 122.567s 
user 0.339s sys 0.016s

With the flag:
 $ ./bin/sentry_authz_provider-test --gtest_filter=*ListTablesBench* 
--num_databases=10 --num_tables_per_db=100 --has-db-privileges=false 
--sentry_require_db_privileges_for_list_tables=true

sentry_authz_provider-test.cc:421] Time spent Listing tables: real 1.869s user 
0.011s sys 0.000s

Change-Id: I6a225932b22470d653d4b40678f32c2b5cb8329c
Reviewed-on: http://gerrit.cloudera.org:8080/13657
Tested-by: Kudu Jenkins
Reviewed-by: Hao Hao <hao....@cloudera.com>
---
M src/kudu/master/sentry_authz_provider-test.cc
M src/kudu/master/sentry_authz_provider.cc
2 files changed, 18 insertions(+), 1 deletion(-)

Approvals:
  Kudu Jenkins: Verified
  Hao Hao: Looks good to me, approved

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Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: I6a225932b22470d653d4b40678f32c2b5cb8329c
Gerrit-Change-Number: 13657
Gerrit-PatchSet: 5
Gerrit-Owner: Hao Hao <hao....@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <aser...@cloudera.com>
Gerrit-Reviewer: Andrew Wong <aw...@cloudera.com>
Gerrit-Reviewer: Grant Henke <granthe...@apache.org>
Gerrit-Reviewer: Hao Hao <hao....@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins (120)

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