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https://issues.apache.org/jira/browse/MAPREDUCE-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150544#comment-13150544
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Vinod Kumar Vavilapalli commented on MAPREDUCE-3251:
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Back and forth on this one.
I went back and looked at an oozie console in action. Checked both running and
completed jobs. Fortunately(and rightly), oozie restricts itself to the
workflow level and doesn't peek into the mapreduce bits like progress, counters
etc. It instead just points to the job's web-page. So, I think we are good if
we just have a mode(a configuration that oozie can explicitly set) to
circumvent communication with the not-reachable-due-to-ACLs MR
ApplicationMasters.
Sure, there can be use-cases beyond oozie that may hit this issue. They can
probably make do with the web-proxy that we have in RM.
> Network ACLs can prevent some clients to talk to MR ApplicationMaster
> ---------------------------------------------------------------------
>
> 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
> Assignee: Anupam Seth
> Priority: Critical
> Fix For: 0.23.1
>
>
> 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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