lnbest0707 opened a new pull request, #5277:
URL: https://github.com/apache/hadoop/pull/5277
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### Description of PR
The patch reuses the resolver introduced from the HDFS side and apply
similar logic to YARN RM service addresses resolving.
To utilize the YARN DNS support and use DNS as endpoint, simply upgrade the
hadoop binary and revise configs from, for example:
`yarn.resourcemanager.address.rm1 rm1_address:8032
yarn.resourcemanager.scheduler.address.rm1 rm1_address:8030
yarn.resourcemanager.resource-tracker.address.rm1 rm1_address:8031
yarn.resourcemanager.admin.address.rm1 rm1_address:8033
yarn.resourcemanager.webapp.address.rm1 rm1_address:8088
yarn.resourcemanager.webapp.https.address.rm1 rm1_address:8090
yarn.resourcemanager.address.rm2 rm2_address:8032
yarn.resourcemanager.scheduler.address.rm2 rm2_address:8030
yarn.resourcemanager.resource-tracker.address.rm2 rm2_address:8031
yarn.resourcemanager.admin.address.rm2 rm2_address:8033
yarn.resourcemanager.webapp.address.rm2 rm2_address:8088
yarn.resourcemanager.webapp.https.address.rm2 rm2_address:8090
yarn.resourcemanager.ha.rm-ids rm1,rm2 to: yarn.resourcemanager.address.rm1
rm_multi_a_dns:8032 yarn.resourcemanager.scheduler.address.rm1
rm_multi_a_dns:8030 yarn.resourcemanager.resource-tracker.address.rm1
rm_multi_a_dns:8031 yarn.resourcemanager.admin.address.rm1 rm_multi_a_dns:8033
yarn.resourcemanager.webapp.address.rm1 rm_multi_a_dns:8088
yarn.resourcemanager.webapp.https.address.rm1 rm_multi_a_dns:8090
yarn.resourcemanager.ha.rm-ids rm1 yarn.resourcemanager.ha.resolve-needed true
yarn.resourcemanager.ha.resolver.useFQDN true # required in secure mode
yarn.resourcemanager.ha.refresh-period-ms 180000 # 3 min`
where rm_multi_a_dns is a multi-A DNS record for rm1_address and
rm2_address. This means the following output on the terminal.
$ dig +short <rm_multi_a_dns> | xargs -n +1 dig +short -x | sort
<rm1_address>
<rm2_address>
For the newly introduced flags, please refer to yarn-default.xml.
### 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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