[jira] [Created] (YARN-9109) DelegationTokenRenewer not resilient to token classload problems

["Steve Loughran (JIRA)" <ji...@apache.org>]

Steve Loughran created YARN-9109:
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             Summary: DelegationTokenRenewer not resilient to token classload problems
                 Key: YARN-9109
                 URL: https://issues.apache.org/jira/browse/YARN-9109
             Project: Hadoop YARN
          Issue Type: Bug
          Components: resourcemanager
    Affects Versions: 3.1.2
            Reporter: Steve Loughran


The DelegationTokenRenewer can't handle the situation of: token implementation class cannot be instantiated.

This is because {{Token.decodeIdentifier()}} throws an RTE  on failure to instantiate, and these aren't caught.

Appears to surfaces in the client: with an error about "Timer Already Cancelled". In the logs, you see this
{code}
Exception: java.lang.NoClassDefFoundError thrown from the UncaughtExceptionHandler in thread "Timer-5"
{code}
At least, I'm assuming this is the cause.... Relates to HADOOP-14556



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