NishthaShah opened a new pull request, #5696:
URL: https://github.com/apache/hadoop/pull/5696
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### Description of PR
getTopTokenRealOwners can't be parsed as json string. And was returning the
following "org.apache.hadoop.metrics2.util.Metrics2Util$NameValuePair@1"
Fixed this to convert the List to string
### How was this patch tested?
Tested the patch by intercepting
TestRouterSecurityManager.testDelgationTokenTopOwners() and converting the
output to string.
Tried to add a test in TestRBFMetrics, but `this.router.getRpcServer()`, is
failing with NullPointerException
### 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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