hangc0276 commented on PR #4069:
URL: https://github.com/apache/bookkeeper/pull/4069#issuecomment-1704529904

   >after we changed to multi ledgerStorageDir, the SyncThread will become 
bottleneck
   
   @lifepuzzlefun Could you provide more detail about the SyncThread bottleneck?
   Checkpoint will triggered in two ways:
   - Triggered by addEntry in SingleDirectoryDbLedgerStorage, which is executed 
by the thread in SingleDirectoryDbLedgerStorage
   - Triggered by SyncThread every 60s by default
   
   When high throughput writes in to bookie, the SyncThread won't be the 
bottleneck for the throughput because the checkpoint will be triggered by the 
thread in SingleDirectoryDbLedgerStorage


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