yuanboliu opened a new pull request, #4198:
URL: https://github.com/apache/hadoop/pull/4198
…d to RM
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### Description of PR
When auth is enabled by NameNode, then delegation token is required if
application needs to acess files/directoies. We find that when app is first
submitted to RM, RM renewer will renew app token no matter whether token is
expired or not. Renewing token is a bit heavy since it uses global write lock.
Here is the result when delegation token is required in a very busy cluster.
### 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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