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From "Milind Bhandarkar (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3251) JobClient should have an option to only to talk to RM+HistoryServer to get job status
Date Mon, 24 Oct 2011 17:56:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13134296#comment-13134296
] 

Milind Bhandarkar commented on MAPREDUCE-3251:
----------------------------------------------

This proposal, as stated, breaks the separation of concerns. RM should not be aware of MR
jobs. Proper wrappers need to be provided to keep RM agnostic of jobs. Thus, AM -> RM should
provide a K-V status message to RM. The RM client (wrapped by JC) should allow fetching such
K-V status specifying a key (which wraps jobid), and the MR-specific portion of JC should
interpret the value as a job status. In my understanding of the current code, I do not see
such abstractions in RM.
                
> 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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