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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