bharath v resolved IMPALA-6851.
    Resolution: Duplicate

> custom cluster test TestGrantRevoke::test_role_update doesn't clean up 
> restarted impala daemons correctly
> ---------------------------------------------------------------------------------------------------------
>                 Key: IMPALA-6851
>                 URL: https://issues.apache.org/jira/browse/IMPALA-6851
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Infrastructure
>    Affects Versions: Impala 2.12.0
>            Reporter: Tianyi Wang
>            Assignee: Tianyi Wang
>            Priority: Major
>             Fix For: Impala 3.0
> In TestGrantRevoke::test_role_update, one of the impala daemons is restarted. 
> When the test finishes, it doesn't kill or wait for the restarted process. 
> There are several problems of not doing so:
> - When another custom cluster test attempts to kill the impala daemon, the 
> impala daemon will become a zombie process. The PID won't go away until the 
> py tests process exits. start-impala-cluster.py doesn't handle this case 
> correctly and will time out. Fortunately, test_role_update is always the last 
> test in custom cluster tests, so it doesn't break builds for now.
> - It leaks PID and process information in the kernel as long as the py test 
> process is running.

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