pan3793 opened a new pull request, #7404:
URL: https://github.com/apache/hadoop/pull/7404
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### Description of PR
As described in YARN-11384,
`DelegationTokenRenewer#removeFailedDelegationToken` may throw NPE due to
`appTokens.get(applicationId)` returning `null` (I'm not sure how this
happened, but it does happen), such an uncaught exception stops the
`renewalTimer` and causes all subsequent apps to fail with "Timer already
cancelled", this effectively leads the entire YARN cluster unavailable.
This patch simply adds a null check to prevent the NPE.
### How was this patch tested?
Change is straightforward I'm not sure whether it requires a UT with plenty
of mocked stuff.
### For code changes:
- [x] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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