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From "Hitesh Shah (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-3098) Report Application status as well as ApplicationMaster status in GetApplicationReportResponse
Date Tue, 27 Sep 2011 21:14:45 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13115936#comment-13115936

Hitesh Shah commented on MAPREDUCE-3098:

bq. The ApplicationState returned to the client via ApplicationReport is really the state
of the application as known to RM. 
True however what this actually represents is the state of the current attempt's AM. A submitted/running/completed
AM only really implies the state of the AM and it would be better if we changed this from
ApplicationState to ApplicationMasterState to avoid confusion as to what it really implies.
From the perspective of a client, a client would prefer to assume that the application 'finish'
state is whether my "job" completed successfully or not.  

Regd. the JobState, I agree. It is app-specific and has no relation to the state of the application
but it should be exposed to the client as part of the report. The RM does not need to act
on it today so a string should work. However, the question is whether using a flexible string/blob
based approach is the way to go? I, in particular, do not have any preference over string/enum.
Having an enum to define a set of end states which most applications will end up in might
be a more stricter but clear approach. The diagnostics string could be used to provide the
additional app specific info if needed. 

So my proposed changes are: 
Change ApplicationState to ApplicationMasterState to improve clarity on what the state implies.
Add ApplicationFinishState to ApplicationReport as an enum. 

A client would monitoring AppMasterState for completion ( succeeded/failed/killed ) and if
succeeded, look at the ApplicationFinishState to actually verify that the work was done successfully.


> Report Application status as well as ApplicationMaster status in GetApplicationReportResponse

> ----------------------------------------------------------------------------------------------
>                 Key: MAPREDUCE-3098
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3098
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>    Affects Versions: 0.23.0
>            Reporter: Hitesh Shah
>            Assignee: Hitesh Shah
>            Priority: Blocker
>             Fix For: 0.23.0
> Currently, an application report received by the client from the RM/ASM for a given application
returns the status of the application master. It does not return the status of the application
i.e. whether that particular job succeeded or failed. 
> The AM status would be one of FINISHED (SUCCEEDED should be renamed to FINISHED as AM
state does not indicate overall success/failure), FAILED or KILLED. 
> The final state sent by the AM to the RM in the FinishApplicationMasterRequest should
be exposed to the client as ApplicationState. 

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