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https://issues.apache.org/jira/browse/YARN-435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13750755#comment-13750755
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Thomas Weise commented on YARN-435:
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For DataTorrent, we require the node report to implement locality constraints
for streaming. We need the initial list (currently only available through
ClientRMProtocol), and then use incremental updates from AMResponse.
> Make it easier to access cluster topology information in an AM
> --------------------------------------------------------------
>
> Key: YARN-435
> URL: https://issues.apache.org/jira/browse/YARN-435
> Project: Hadoop YARN
> Issue Type: Sub-task
> Reporter: Hitesh Shah
> Assignee: Omkar Vinit Joshi
>
> ClientRMProtocol exposes a getClusterNodes api that provides a report on all
> nodes in the cluster including their rack information.
> However, this requires the AM to open and establish a separate connection to
> the RM in addition to one for the AMRMProtocol.
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