[GitHub] [pulsar] jerrypeng opened a new pull request #3751: fix function termination cleanup

[GitBox <gi...@apache.org>]

jerrypeng opened a new pull request #3751: fix function termination cleanup
URL: https://github.com/apache/pulsar/pull/3751
 
 
   ### Motivation
   
   Currently the termination routine runs once for every function instance scheduled on a particular worker.  If there are multiple instances of a function scheduled on a single worker, the termination routine will run when terminating for each instance.
   
   In the termination routine we cleanup subscriptions created by the function.  Ideally this only runs once when all instances of functions have stopped.  However that kind of coordination is hard to accomplish but a least on a per worker basis lets only run the termination routine on the last instance running on that worker. So that a least we are running the termination routine only once for a function on a per worker basis
   
   

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