jsancio commented on PR #12274:
URL: https://github.com/apache/kafka/pull/12274#issuecomment-1177949852

   > I havn't flesh it, the basic idea is shown in this PR, only read up to 
Isolation.COMMITTED when reading from observer and invoke 
fetchPurgatory.maybeComplete(highWatermark.offset, currentTimeMs) on 
onUpdateLeaderHighWatermark.
   
   I see. This would not work for co-located Kafka servers, right? Co-located 
Kafka server are servers that are running both a controller and a broker. In 
that case the replica will read uncommitted data and the leader will not send a 
FETCH response when the HW changes.


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