lhotari commented on PR #23829:
URL: https://github.com/apache/pulsar/pull/23829#issuecomment-2581309688

   > The function worker does not recover, leading to an ongoing failure. With 
this update, the worker will automatically restart with the help of health 
check with liveliness probe upon encountering this error, ensuring proper 
recovery and continuity of operations.
   
   Although adding a liveness check could be useful for many reasons, it would 
be better to primarily address this issue. Are you able to isolate and 
reproduce the issue? What Pulsar version are you running?
   
   It looks like the leader election for the function worker uses a consumer 
with `consumerEventListener` to find who is the leader:
   
https://github.com/apache/pulsar/blob/3396065a3a62af3e3586700f0bbfcbff93716b48/pulsar-functions/worker/src/main/java/org/apache/pulsar/functions/worker/LeaderService.java#L76-L87
   
   There might be a bug in the Pulsar implementation of notifying the active 
consumer change:
   
https://github.com/apache/pulsar/blob/49aa3080d422994baa036ed0b743a2fa18a6d530/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/AbstractDispatcherSingleActiveConsumer.java#L213-L223
   
   At least by reading the code, it's hard to see how that could work.
   
   
   


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