tree d2e6d646f2b91dddb5f4ada4d985ab54525b5315
parent 320f05852060c1027326ac20be7df340a7a5263f
author xuzhou <peter.cose.seu@gmail.com> 1576833939 +0800
committer Impala Public Jenkins <impala-public-jenkins@cloudera.com> 1577462951 +0000

IMPALA-9195: Using multithreaded execution to accelerate 'show tables/databases'

If Sentry authorization is enabled, users with multi group-policies
will take time to get the result of 'show tables/databases'. It seems
that ResourceAuthorizationProvider.hasAccess performs bad for users
with complex group-policies, IMPALA-9242 will target to address this
problem.

This patch provides a config option 'num_check_authorization_threads' to
accelerate 'show tables/databases' by using multithreading. This configuration
is applicable only when authorization is enabled. A value of 1 disables
multi-threaded execution for checking access. However, a small value of larger
than 1 may limit the parallism of FE requests when checking authorization with
a high concurrency. The value must be in the range of 1 to 128. The default
value of 'num_check_access_threads' is 1.

Change-Id: I860e0d18afa0421665f8b3b1c5561d6bdacc5e96
Reviewed-on: http://gerrit.cloudera.org:8080/14846
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>