Ivan Andika created RATIS-2156:
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Summary: Notify follower slowness based on the log index
Key: RATIS-2156
URL: https://issues.apache.org/jira/browse/RATIS-2156
Project: Ratis
Issue Type: Improvement
Reporter: Ivan Andika
Assignee: Ivan Andika
Currently the StateMachine.LeaderEventApi#notifyFollowerSlowness is based on
raft.server.rpc.slowness.timeout, we saw that sometimes there are some cases
where the rpc rtt between the leader and follower does not exceed the timeout,
the difference of the log index between the leader and follower keeps
increasing, i.e. the slow follower cannot catch up.
In Ozone, this causes most watch request with ALL_COMMITTED replication to
timeout, causing increased latency of writes. It is better to close the
pipeline if the slow follower cannot catch up.
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