rdhabalia opened a new pull request #2269: handle subscription-already-exist 
exception on partitioned-topic for create-sub admin-api
URL: https://github.com/apache/incubator-pulsar/pull/2269
 
 
   ### Motivation
   
   right now, application uses admin api to create subscription on partitioned 
topic. if subscription creation fails for one of the partition then it gives 
error to application. so, if application retries to create subscription again 
then admin api always gives `subscription-already-exist` exception (because 
previous call has partially created subscription on some of the partitions) and 
user/application will never be able to handle this scenario correctly.
   
   ### Modifications
   
   handle partially failed request for create-subscription api.
   admin api fails request only if
   - subscription is created for all partitions
   
   
   ### Result
   
   server handles and sends correct error-response for partially failed create 
subscription request.
   

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