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https://issues.apache.org/jira/browse/MAPREDUCE-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13246258#comment-13246258
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Robert Joseph Evans commented on MAPREDUCE-3315:
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You could use an ephemeral port rather then limiting the set of ports needed.
either way you are going to need to send the port to the workers probably as an
environment variable. Without it workers could join with the incorrect master,
and a malicious or buggy master could accept them and steal the worker.
> Master-Worker Application on YARN
> ---------------------------------
>
> Key: MAPREDUCE-3315
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3315
> Project: Hadoop Map/Reduce
> Issue Type: New Feature
> Reporter: Sharad Agarwal
> Assignee: Sharad Agarwal
> Fix For: 0.24.0
>
> Attachments: MAPREDUCE-3315-1.patch, MAPREDUCE-3315.patch
>
>
> Currently master worker scenarios are forced fit into Map-Reduce. Now with
> YARN, these can be first class and would benefit real/near realtime workloads
> and be more effective in using the cluster resources.
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