liangyepianzhou commented on PR #22034:
URL: https://github.com/apache/pulsar/pull/22034#issuecomment-1952363895

   >I wonder if we should close the old one and create a new one if the last 
ledger is empty.
   
   This case should not happen.
   For timed tasks, call `rollCurrentLedgerIfFull`. It will check the ledger is 
not empty.
   ```java
           if (currentLedgerEntries > 0 && currentLedgerIsFull()
                   && STATE_UPDATER.compareAndSet(this, State.LedgerOpened, 
State.ClosingLedger)) {
                   ...
           }        
   ```
   For the add-entry process, the ledger will be closed after the entry is 
added completely.
   


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