Tianyi Wang created IMPALA-6851:
-----------------------------------

             Summary: 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
             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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