xwu99 commented on pull request #33941:
URL: https://github.com/apache/spark/pull/33941#issuecomment-1067466661


   > It think it would be best to backup and discuss what exactly we want to 
target for this PR. These are the things I'm thinking:
   > 
   > * Support a basic reuse policy (perhaps EXEC_CORES_EQUAL since I think 
that was your original use case) and allow user to specify their own.  ie 
config that perhaps load all policies, like the spark.plugins config. User can 
give the policy a name and reference it by name.
   > * I think we can keep the reuse policy specified at the application level 
rather then stage level to keep logic easier for now.  We can always add an 
interface to specify at stage level later.
   
   For those two I agree to keep it simple at first to address the most common 
scenarios.  I would check the other comments in the coming weeks. 
   
   > * Do we want to allow reusing without dynamic allocation?  We would have 
to throw at runtime if we discovered they tried to specify resource profile 
that wouldn't be compatible.  We could keep this PR simple and not support that 
at first.
   
   Since ResourceProfiles are only supported with dynamic allocation right now. 
(SparkException("ResourceProfiles are only supported on YARN and Kubernetes 
with dynamic allocation enabled."). Maybe a seperate PR to address that. 
   
   > does that sound ok?
   
   


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