[GitHub] [bookkeeper] Vanlightly commented on issue #2974: When the journal directory is even, the journal data is unevenly distributed

[GitBox <gi...@apache.org>]

Vanlightly commented on issue #2974:
URL: https://github.com/apache/bookkeeper/issues/2974#issuecomment-1028054818


   Changing the routing without some kind of migration will result in effective data loss. Plus an md5 hash is relatively expensive.
   
   The issue here is that ledger ids are all even. I am seeing this myself which results in only even numbered read threads from being routed to. This problem of even ledger ids affects the selection of journals, ledger storage, read threads and write threads. It is a real problem.
   
   @eolivelli This is a pretty serious problem as we're throwing away a bunch of scaling mechanisms.


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