aloyszhang opened a new pull request #9067:
URL: https://github.com/apache/pulsar/pull/9067


   ### Motivation
   This pull requeset adds `Commands.peekBrokerEntryMetadataIfExist` method to 
support peek broker entry metadata.
   
   This will be used in protocol handler KOP.  
   Currently, when handles `FetchRequest`, KOP will
   1. firset read `Entry` out of ledger
   2. get `BaseOffset` from `Enty` for building `MemoryRecordsBuilder`
   3. traverse every `Entry` and add each message into `MemoryRecordsBuilder`
   we need the `Entry` twice, first for peeking the offset and second for 
buiding `MemoryRecordsBuilder`.
   
   So, we should support only peek the broker entry metadata without changing 
the original entry content.
   
   


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