jerrypeng commented on issue #2259: Fix: set subscription-type based on message 
ordering
URL: https://github.com/apache/incubator-pulsar/pull/2259#issuecomment-409335711
 
 
   @rdhabalia @merlimat @sijie @srkukarni 
   I don't believe we have to correct mechanism for setting the subscription 
type in this PR as well as in CmdSinks base off of the retainOrder flag.  
   
   For functions, sources, and sinks, if the processing guarantee is set to 
effectively once, it is implied that order should be maintained and the 
subscription type to be failover.  Only for at-most-once and at-once processing 
guarantees should we allow the user the change/choose between failover and 
shared.  I think we should bring back the subscriptionType flag for users to be 
able to override the subscription type when in at-most-once or at-least-once 
mode.

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