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https://issues.apache.org/jira/browse/MAPREDUCE-2892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13093642#comment-13093642
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Vinod Kumar Vavilapalli commented on MAPREDUCE-2892:
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bq. FinishApplicationMasterRequest doesn't need to send out 'tracking url'.
The tracking url for an App can change when it finishes. For e.g., in
mapreduce, the tracking-url for a job is the AM web UI while the AM is up, and
will change to the history server URL on AM finish.
bq. FinishApplicationMasterRequest shouldn't use 'string' as final state - it's
got to be an enum and we need to use that enum appropriately in the RM's
state-machines.
This final state is framework specific (mapreduce specific for e.g.) and has no
bearing on the final state of the ApplicationMaster in the RM. This state is
*only used* to be displayed on the UI as the final state of the job specific to
the framework and for nothing else. Sharad an I discussed this and concluded
that this can best be a binary blob or a string, an ENUM isn't possible and
doesn't make sense for enumerating all possible final states of all possible
frameworks.
We can just document both these fields with the above descriptions.
> Improvements to AM apis
> -----------------------
>
> Key: MAPREDUCE-2892
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2892
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mr-am, mrv2, resourcemanager
> Affects Versions: 0.23.0
> Reporter: Arun C Murthy
> Priority: Blocker
> Fix For: 0.23.0
>
>
> Some api changes before we declare yarn apis as stable:
> # FinishApplicationMasterRequest doesn't need to send out 'tracking url'.
> # FinishApplicationMasterRequest shouldn't use 'string' as final state - it's
> got to be an enum and we need to use that enum appropriately in the RM's
> state-machines.
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