MarvinCai opened a new pull request #4265: [transaction][acknowledge] Introduce 
PENDING_ACK state in acknowledgement path
URL: https://github.com/apache/pulsar/pull/4265
 
 
   Master Issue: #2664
   
   Motivation:
   Add acknowledgeMessage, commit, abort for transaction in 
PersistentSubscription.
   
   Changes:
   Will put message in Pending_ACK status when acknowledgeMessage is called 
with TxnID.
   No real status class introduced, only added collection to hold messages in 
Pending_ACK status.
   
   Add commitTxn to put message to Deleted status.
   Add abortTxn to put message to Pending status.
   
   For normal acknowledgeMessage and redeliverUnacknowledgedMessages, will 
check to see if 
   message if message is in Pending_ACK first. If true, will **ignore** those 
acks/redeliverys.
   
   Add unit test.
   

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