[jira] [Updated] (SLIDER-85) Slider AM to recognise & fail when another instance of the same name is up.

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

     [ https://issues.apache.org/jira/browse/SLIDER-85?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran updated SLIDER-85:
---------------------------------

    Sprint: slider June 2

> 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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