[jira] [Created] (YARN-5901) Fix race condition in TestGetGroups beforeclass setup()

["Haibo Chen (JIRA)" <ji...@apache.org>]

Haibo Chen created YARN-5901:
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             Summary: Fix race condition in TestGetGroups beforeclass setup()
                 Key: YARN-5901
                 URL: https://issues.apache.org/jira/browse/YARN-5901
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
    Affects Versions: 3.0.0-alpha1
            Reporter: Haibo Chen
            Assignee: Haibo Chen


In TestGetGroups, the class-level setup method spins up, in a child thread, a resource manager that Yarn clients can talk to. But it checks whether the resource manager is fully started by doing resourcemanager.getServiceState() == STATE.STARTED. This is not reliable since resourcemanager.start() will first trigger service state change in RM, and then starts up all the services added to RM. We need to wait for RM to fully start before YARN clients  can send requests. Otherwise, the tests can fail due to "connection refused"  exception when the main thread sends out client requests to RM and if the RPC server has not fired up in the child thread.  



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