coderzc commented on PR #22610:
URL: https://github.com/apache/pulsar/pull/22610#issuecomment-2081864440

   > > It seems we don't need `maxReadPosition.compareTo((PositionImpl) 
getLastPosition()) != 0` judgment condition, since `maxReadPosition` also may 
not be a valid position for transaction topic event if `maxReadPosition < 
lastPosition`.
   > 
   > I don't understand, why?
   
   @dao-jun `maxReadPosition` is just the position in front of the ongoing 
transaction. It can only ensure that this is not a pending transaction 
position. but it's not necessarily a normal message.
   
   See: 
https://github.com/apache/pulsar/blob/264722f1da9ab806c9a79196c091bfe4d03b3090/pulsar-broker/src/main/java/org/apache/pulsar/broker/transaction/buffer/impl/TopicTransactionBuffer.java#L447-L459


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