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https://issues.apache.org/jira/browse/YARN-8333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16495861#comment-16495861
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Eric Yang commented on YARN-8333:
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[~billie.rinaldi] Thank you for the review. Patch 3 added documentation to
ServiceDiscovery.md.
> Load balance YARN services using RegistryDNS multiple A records
> ---------------------------------------------------------------
>
> Key: YARN-8333
> URL: https://issues.apache.org/jira/browse/YARN-8333
> Project: Hadoop YARN
> Issue Type: Improvement
> Components: yarn-native-services
> Affects Versions: 3.1.0
> Reporter: Eric Yang
> Assignee: Eric Yang
> Priority: Major
> Attachments: YARN-8333.001.patch, YARN-8333.002.patch,
> YARN-8333.003.patch
>
>
> For scaling stateless containers, it would be great to support DNS round
> robin for fault tolerance and load balancing. The current DNS record format
> for RegistryDNS is
> [container-instance].[application-name].[username].[domain]. For example:
> {code}
> appcatalog-0.appname.hbase.ycluster. IN A 123.123.123.120
> appcatalog-1.appname.hbase.ycluster. IN A 123.123.123.121
> appcatalog-2.appname.hbase.ycluster. IN A 123.123.123.122
> appcatalog-3.appname.hbase.ycluster. IN A 123.123.123.123
> {code}
> It would be nice to add multi-A record that contains all IP addresses of the
> same component in addition to the instance based records. For example:
> {code}
> appcatalog.appname.hbase.ycluster. IN A 123.123.123.120
> appcatalog.appname.hbase.ycluster. IN A 123.123.123.121
> appcatalog.appname.hbase.ycluster. IN A 123.123.123.122
> appcatalog.appname.hbase.ycluster. IN A 123.123.123.123
> {code}
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