Steve Loughran created SLIDER-85:
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Summary: 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
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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