Abacn opened a new pull request, #30853:
URL: https://github.com/apache/beam/pull/30853

   Test only, attempt to fix 
https://github.com/apache/beam/pull/30218#issuecomment-2037429676
   
   However, found that if the checkpoint can expire, the messages unacked will 
get redelivered, but the new checkpoint won't finalize either, causing 
repetitive redeliver and duplicate messages.
   
   I now think the underlying issue is that finalizing checkpoint is not 
guaranteed to happen timely. This is work as expected. Expiring outstanding 
checkpoint won't resolve the stucked messages when throughput is low given the 
asynchronous ack mechanism.
   
   Thus, another option is to expose "Auto acknowledge" client option to JmsIO 
to retain the previous behavior, however, data loss is possible, as in previous 
implementation 
   
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