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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4014) Make yarn-common services robust
Date Thu, 15 Mar 2012 21:16:38 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13230558#comment-13230558
] 

Steve Loughran commented on MAPREDUCE-4014:
-------------------------------------------

I'm going to submit an initial patch soon, but want to flag up something first. Should CompositeService
attempt to {{stop()}} all its child services when told to {{stop()}} itself - regardless of
what state the it is in? This would be consistent with a philosophy of "support the stop operation
regardless of your state".

Without that you can't reliably clean up during failed start operations -which the CompositeService
itself tries to do by stopping all child services if any one of them fails to start - including
the service that failed.
                
> Make yarn-common services robust
> --------------------------------
>
>                 Key: MAPREDUCE-4014
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-4014
>             Project: Hadoop Map/Reduce
>          Issue Type: Sub-task
>          Components: mrv2
>    Affects Versions: 0.23.1, 0.24.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>              Labels: yarn
>
> Review the yarn common services ({{CompositeService}}, {{AbstractLivelinessMonitor}}
and make their service startup _and especially shutdown_ more robust against out-of-lifecycle
invocation and partially complete initialization.
> Write tests for these where possible. 

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