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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4015) Yarn services to throw a YarnException on invalid state changs
Date Thu, 15 Mar 2012 16:41:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230288#comment-13230288
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Steve Loughran commented on MAPREDUCE-4015:
-------------------------------------------

this should be a new exception, say {{YarnIllegalLifecycleException}} that includes a ref
to the service at fault and expected state. This will aid in testing -a human readable string
can also be generated from this.
                
> Yarn services to throw a YarnException on invalid state changs
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-4015
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4015
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>    Affects Versions: 0.23.1, 0.24.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
>
> the {{EnsureCurrentState()}} checks of services throw an {{IllegalStateException}}  if
the state is wrong. If this was changed to {{YarnException}}. wrapper services such as CompositeService
could relay this direct, instead of wrapping it in their own.
> Time to implement mainly in changing the lifecycle test cases of MAPREDUCE-3939 subtasks.

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