hangc0276 commented on PR #3263:
URL: https://github.com/apache/bookkeeper/pull/3263#issuecomment-1153142010

   > > The biggest difference is the padding. Direct I/O must write in aligned 
blocked.
   > > Another difference in the format is that the header is now 4K rather 
than 1K. Again, this is to allow aligned rights. No changes are necessary to 
allow the existing entry logger to deal with the header change, as we create a 
dummy entry in the extra header space that the existing entry logger already 
knows to ignore.
   > 
   > I think this calls to addition of backwards-compat tests, 
upgrade/downgrade scenario (data written with these changes can be read by 
previous version of BK and vice versa)
   > 
   > https://github.com/apache/bookkeeper/tree/master/tests/backward-compat
   
   Ok, I will add the backwards-compact tests.


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