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https://issues.apache.org/jira/browse/YARN-11391?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17644545#comment-17644545
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ASF GitHub Bot commented on YARN-11391:
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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?
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`NOTICE-binary` files?
> Support using DNS to resolve yarn services to IP addresses
> ----------------------------------------------------------
>
> Key: YARN-11391
> URL: https://issues.apache.org/jira/browse/YARN-11391
> Project: Hadoop YARN
> Issue Type: New Feature
> Reporter: Shuyi Zhang
> Priority: Major
>
> We have been using A-record (hostname) for discovering YARN control
> planes(RM, JHS) from both the server and client sides. The components
> discover each other using hostnames (DNS A-records) which are preconfigured
> in YARN configurations (mapred-site.xml and yarn-site.xml). However, the
> hard-coded address mapping is prohibitive to perform appropriate failure
> recovery and node replacement. Any host replacement, adding, or removing
> requires client integration, which is a quite painful process.
> It is essential to find a solution where the discovery configuration of
> different components in the cluster stays intact and is able to resolve with
> the latest hostname/records.
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