[jira] [Updated] (YARN-804) mark AbstractService init/start/stop methods as final

["Vinod Kumar Vavilapalli (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/YARN-804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vinod Kumar Vavilapalli updated YARN-804:
-----------------------------------------

    Issue Type: Sub-task  (was: Improvement)
        Parent: YARN-117
    
> mark AbstractService init/start/stop methods as final
> -----------------------------------------------------
>
>                 Key: YARN-804
>                 URL: https://issues.apache.org/jira/browse/YARN-804
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>    Affects Versions: 2.1.0-beta
>            Reporter: Steve Loughran
>
> Now that YARN-117 and MAPREDUCE-5298 are checked in, we can mark the public AbstractService init/start/stop methods as final.
> Why? It puts the lifecycle check and error handling around the subclass code, ensuring no lifecycle method gets called in the wrong state or gets called more than once.When a {{serviceInit(), serviceStart()  & serviceStop()}} method throws an exception, it's caught and auto-triggers stop. 
> Marking the methods as final forces service implementations to move to the stricter lifecycle. It has one side effect: some of the mocking tests play up -I'll need some assistance here

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