lnbest0707 opened a new pull request, #5196:
URL: https://github.com/apache/hadoop/pull/5196
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### Description of PR
Add DNS discovery support for YARN RM services. It would accept DNS multi-A
record as input from yarn-site.xml. Upon configurations, it would resolve the
DNS and do reverse lookup. Both server (RM, NM, app container) and client could
utilize the same DNS functionality. Besides, it is backward compatible with
plain DNS A record.
### How was this patch tested?
local mvn test
### 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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