Create new cluster for each job execution #1500
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Summary
Create a new RayCluster each time we execute a job.
Details and comments
This will be better for resource management, as each job will get exactly the resources requested. Previously, if a user submitted two jobs they would run in the same cluster and sharing resources, so the resource requests wouldn't necessarily be honored exactly.
Plus, this will also be the default behavior after migrating to RayJobs (#1337), so its not something we weren't planning on doing eventually anyway.