[GitHub] [ozone] sodonnel commented on pull request #5288: HDDS-9279. OM HA: support read from followers.

["sodonnel (via GitHub)" <gi...@apache.org>]

sodonnel commented on PR #5288:
URL: https://github.com/apache/ozone/pull/5288#issuecomment-1718352038

   My immediate thought on this, without fully understanding the details, is that this is a major change in behavior and should probably be off by default until is sees more testing.
   
   Is it possible for some followers to fall behind - if so how is this handled?
   
   Or are the followers always totally up to date? Eg, is a commit key on the leader absolutely available on all followers when the client call to commit the key returns, so that if a client immediately issues a read and it hits a different OM, it will see the data?
   
   Is there a performance implication for writes by setting this on? Eg in the old way, as the followers slightly behind as they apply the Ratis log, while with this on its more like a 3 way commit for each write, so a delay (eg GC pause) on one OM would affect the write time on the leader?


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