[jira] [Created] (YARN-11384) NPE in DelegationTokenRenewer causes all subsequent apps to fail with "Timer already cancelled"

["Aditya Sharma (Jira)" <ji...@apache.org>]

Aditya Sharma created YARN-11384:
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             Summary: NPE in DelegationTokenRenewer causes all subsequent apps to fail with "Timer already cancelled"
                 Key: YARN-11384
                 URL: https://issues.apache.org/jira/browse/YARN-11384
             Project: Hadoop YARN
          Issue Type: Bug
          Components: yarn
            Reporter: Aditya Sharma
            Assignee: Aditya Sharma


All newly submitted yarn apps start failing with following error in the diagnostic message

{noformat}
org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer: Unable to add the application to the delegation token renewer.
java.lang.IllegalStateException: Timer already cancelled.
        at java.util.Timer.sched(Timer.java:397)
        at java.util.Timer.schedule(Timer.java:208)
        at org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.setTimerForTokenRenewal(DelegationTokenRenewer.java:604)
        at org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.handleAppSubmitEvent(DelegationTokenRenewer.java:515)
        at org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer.access$900(DelegationTokenRenewer.java:79)
        at org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.handleDTRenewerAppSubmitEvent(DelegationTokenRenewer.java:923)
        at org.apache.hadoop.yarn.server.resourcemanager.security.DelegationTokenRenewer$DelegationTokenRenewerRunnable.run(DelegationTokenRenewer.java:900)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at java.lang.Thread.run(Thread.java:748)
{noformat}

 Any uncaught exception at DelegationTokenRenewer.RenewalTimerTask#run causes all subsequent yarn apps to fail with java.lang.IllegalStateException: Timer already cancelled

One such NPE is thrown when DelegationTokenRenewer.RenewalTimerTask#run invokes  DelegationTokenRenewer#removeFailedDelegationToken that tries to remove token from the "DelegationTokenRenewer#appTokens" for an applicationId.

If DelegationTokenRenewer#appTokens map didn’t have the <ApplicationId, Set<DelegationTokenToRenew>> entry while token (DelegationTokenToRenew) had the reference to the applicationId, then NPE is thrown leading to "Timer already cancelled"

 



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