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https://issues.apache.org/jira/browse/MAPREDUCE-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13135487#comment-13135487
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Arun C Murthy commented on MAPREDUCE-3251:
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Milind, this option is only for jobclients who cannot talk to AM directly, they
get to choose. By default we assume JobClient can talk to AM to get full status
etc.
As described in the description of the jira it's for a few special cases.
> JobClient should have an option to only to talk to RM+HistoryServer to get
> job status
> -------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-3251
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3251
> Project: Hadoop Map/Reduce
> Issue Type: Task
> Components: mrv2
> Affects Versions: 0.23.0
> Reporter: Anupam Seth
> Priority: Blocker
> Fix For: 0.23.0
>
>
> In 0.20.xxx, the JobClient while polling goes to JT to get the job status.
> With YARN, AM can be launched on any port and the client will have to have
> ACL open to that port to talk to AM and get the job status. When the client
> is within the same grid network access to AM is not a problem. But some
> applications may have one installation per set of clusters and may launch
> jobs even across such sets (on job trackers in another set of clusters). For
> that to work only the JT port needs to be open currently. In case of YARN,
> all ports will have to be opened up for things to work. That would be a
> security no-no.
> There are two possible solutions:
> 1) Make the job client only talk to RM (as an option) to get the job
> status.
> 2) Limit the range of ports AM can listen on.
> Option 2) may not be favorable as there is no direct OS API to find a free
> port.
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