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https://issues.apache.org/jira/browse/SLIDER-85?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003120#comment-14003120
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Steve Loughran commented on SLIDER-85:
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testing will be hard here -best tactic would be explicitly create the registry
entry in the junit process, then start the AM and expect a failure
> Slider AM to recognise & fail when another instance of the same name is up.
> ---------------------------------------------------------------------------
>
> Key: SLIDER-85
> URL: https://issues.apache.org/jira/browse/SLIDER-85
> Project: Slider
> Issue Type: Improvement
> Components: appmaster, registry
> Affects Versions: Slider 0.30
> Reporter: Steve Loughran
> Original Estimate: 3h
> Remaining Estimate: 3h
>
> using the YARN app reports to enumerate instances before launching has a race
> condition two attempts to deploy the same application instance could be made.
> If neither operation was visible in the queue when it was polled, they'd both
> get in
> All HBase/accumulo instances would join up to form an aggregate cluster,
> which could be confusing, and complicate other operations like "stop".
> The registry can be used to fix this: if there is an instance already of that
> name, the AM should fail
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