[jira] [Commented] (YARN-679) add an entry point that can start any Yarn service

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14017618#comment-14017618 ] 

Steve Loughran commented on YARN-679:
-------------------------------------

This turns out to be useful both client-side and server-side. as any client that directly subclasses {{YarnClientImpl }} or hosts it within its own service composite can become a launched service. Similarly, AMs and containers are/contain YARN services, and need their own entry points.

Having a single entry point means more effort can be put in to having an entry point, rather than per-service ones that are implemented by cut-and-paste and may be under-maintained.
# effectively guarantees a well-tested shutdown/interrupt handler
# effectively guarantees more functional testing of failure paths
# with a good factoring of operations it also enables good unit test coverage
# makes it easier to write new YARN services
# provides a standard base set of exit codes
# allows for a single entry point script to directly create and run YARN services

> add an entry point that can start any Yarn service
> --------------------------------------------------
>
>                 Key: YARN-679
>                 URL: https://issues.apache.org/jira/browse/YARN-679
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: api
>    Affects Versions: 2.4.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>         Attachments: YARN-679-001.patch
>
>
> There's no need to write separate .main classes for every Yarn service, given that the startup mechanism should be identical: create, init, start, wait for stopped -with an interrupt handler to trigger a clean shutdown on a control-c interrrupt.
> Provide one that takes any classname, and a list of config files/options



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