jerrypeng opened a new pull request #4103: Function neg ack
URL: https://github.com/apache/pulsar/pull/4103
 
 
   ### Motivation
   
   Since negative acknowledgements were added to Pulsar,  Pulsar functions 
should take advantage of this functionality.  When a error, e.g. user 
exception, happens we should send a negative ack so that the message can be 
redelivered and reprocessed. 
   
   Currently, users will have set the ackTimeout config for messages to be 
redelivered when an error happens.  This is cumbersome for users and hard to 
get right when process times vary
   

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