iwasakims opened a new pull request #2619:
URL: https://github.com/apache/hadoop/pull/2619


   https://issues.apache.org/jira/browse/YARN-10500
   
   * Unclosed DelegationTokenRenewer affects testRMRestartWithExpiredToken. I 
could easily reproduce the failure by `mvn test 
-Dtest=TestDelegationTokenRenewer` but not by `mvn test 
-Dtest=TestDelegationTokenRenewer#testRMRestartWithExpiredToken` never fails.
   * Assertion in testRMRestartWithExpiredToken must wait for token renewal.
   * The timeout for the `waitFor` in testTokenThreadTimeout is too strict for 
the timeout and retry interval.
   


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