Steve Loughran commented on YARN-535:

I want to get all my outstanding patches in... I just resubmitted it to see 
what state it was in

> TestUnmanagedAMLauncher can corrupt target/test-classes/yarn-site.xml during 
> write phase, breaks later test runs
> ----------------------------------------------------------------------------------------------------------------
>                 Key: YARN-535
>                 URL: https://issues.apache.org/jira/browse/YARN-535
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: applications
>    Affects Versions: 2.6.0
>         Environment: OS/X laptop, HFS+ filesystem
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Minor
>         Attachments: YARN-535-02.patch, YARN-535.patch
> the setup phase of {{TestUnmanagedAMLauncher}} overwrites {{yarn-site.xml}}. 
> As {{Configuration.writeXml()}} does a reread of all resources, this will 
> break if the (open-for-writing) resource is already visible as an empty file. 
> This leaves a corrupted {{target/test-classes/yarn-site.xml}}, which breaks 
> later test runs -because it is not overwritten by later incremental builds, 
> due to timestamps.

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