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Posted to issues@bookkeeper.apache.org by GitBox <gi...@apache.org> on 2022/05/10 18:59:55 UTC

[GitHub] [bookkeeper] dlg99 commented on pull request #3263: BP-47 (task6): Direct I/O entrylogger support

dlg99 commented on PR #3263:
URL: https://github.com/apache/bookkeeper/pull/3263#issuecomment-1122756450

   > 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


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