KeeProMise opened a new pull request, #6298:
URL: https://github.com/apache/hadoop/pull/6298
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### Description of PR
Bug description
When the router uses FairnessPolicyController, each time a request is
processed,
the permit of the ns corresponding to the request will be obtained first
(method acquirePermit),
and then the information of namenodes corresponding to the ns will be
obtained(method getOrderedNamenodes).
getOrderedNamenodes comes after acquirePermit, so if acquirePermit succeeds
but getOrderedNamenodes throws an exception, the permit cannot be released.
How to reproduce
Use the original code to run the new unit test
testReleasedWhenExceptionOccurs in this PR
### How was this patch tested?
### For code changes:
- [ ] 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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