Steve Loughran commented on YARN-1564:

Sync on AtomicBool warnings are spurious; code is simply using the (final) 
objects as something to wait/notify off to indicate status updates within the 
atomic values themselves. Nothing wrong with that —avoids having a separate 
object, and makes it obvious what things are waiting on. Presumably the check 
is there for people who don't know what they are doing.

> add some basic workflow YARN services
> -------------------------------------
>                 Key: YARN-1564
>                 URL: https://issues.apache.org/jira/browse/YARN-1564
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: api
>    Affects Versions: 2.4.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: YARN-1564-001.patch, YARN-1564-002.patch
>   Original Estimate: 24h
>          Time Spent: 48h
>  Remaining Estimate: 0h
> I've been using some alternative composite services to help build workflows 
> of process execution in a YARN AM.
> They and their tests could be moved in YARN for the use by others -this would 
> make it easier to build aggregate services in an AM

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