ivankelly commented on issue #279: Provide LSN in Journal for better 
URL: https://github.com/apache/bookkeeper/issues/279#issuecomment-372258323
   @sijie to confirm what the comment says, it proposes that when we write to 
the journal for an entry, we take a mark of the point of the journal(called LSN 
here) at which the entry was persisted, and pass this along with the entry to 
the ledger storage. The ledger storage can then make it's own decision on when 
to sync, and when it does, it can just inform the journal of the LSN up to 
which all data has been persisted. This can be either push or pull from the 
journal PoV. Correct?
   I think this is a good change, and wouldn't be particularly big. Now is a 
good time to do it too, or maybe once the per ledger entrylog stuff is in, 
which should be fairly soon.

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