3pacccccc commented on PR #24449:
URL: https://github.com/apache/pulsar/pull/24449#issuecomment-3004474758

   > > I'm wondering does 
`lastDispatchablePosition.compareTo(lastCompactedPosition) > 0` really means 
need to triggering compaction? For example, I publish a message with no key 
present after last compaction, there's actually no need to triggering 
compaction as well.
   > 
   > if `topicCompactionRetainNullKey=false`, then a message with no key may be 
deleted during compaction, so trigger compaction task is meaningful
   
   OK, I get it, thank you, now LGTM


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