Alex Petrov created CASSANDRA-15352:

             Summary: Replica failure propagation to coordinator and client
                 Key: CASSANDRA-15352
             Project: Cassandra
          Issue Type: New Feature
          Components: Messaging/Internode
            Reporter: Alex Petrov

We should add early reporting of replica-side errors, since currently we just 
time-out requests. On normal read-write path this is not that important, but 
this is a protocol change we will need to improve cheap quorums for transient 
replication. This might have potential positive impact for regular read-write 
path, since we’ll be aborting queries early instead of timing them out. Can be 
useful for failing / going away nodes (which is also one of the changes we’re 
planning to implement). 

We do have means for propagating error both in client protocol through 
<reasonmap> and in internode through FAILURE_RSP, which is true and we do not 
have to extend the protocol to implement this change, but this is still a 
change in protocol behavior, since we’ll be sending a message where we would 
usually silently timeout.

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