eolivelli commented on issue #853: BP-14 WriteFlag DEFERRED_SYNC Client Side 
Implementation
URL: https://github.com/apache/bookkeeper/pull/853#issuecomment-389789447
 
 
   @jvrao  @sijie another idea to implement both of the two behaviours
   
   we can do that DEFERRED_SYNC writeflag, acts like in this patch, that is LAC 
does not advance without explicit force()
   
   we can add an additional write flag, like OPTIMISTIC_LAC, to be set together 
with DEFERRED_SYNC , which makes lastAddConfirmed advance in 
sendAddSuccessCallbacks even in presence of DEFERRED_SYNC
   
   like:
   
   ```
   if (!writeFlags.contains(WriteFlag.DEFERRED_SYNC)  
             || writeFlags.contains(WriteFlag.OPTIMISTIC_LAC)) {
   
                   this.lastAddConfirmed = pendingAddsSequenceHead;
   }
    ```

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