Anna Povzner created KAFKA-8001:
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Summary: Fetch from future replica stalls when local replica
becomes a leader
Key: KAFKA-8001
URL: https://issues.apache.org/jira/browse/KAFKA-8001
Project: Kafka
Issue Type: Bug
Components: core
Affects Versions: 2.1.1
Reporter: Anna Povzner
With KIP-320, fetch from follower / future replica returns FENCED_LEADER_EPOCH
if current leader epoch in the request is lower than the leader epoch known to
the leader (or local replica in case of future replica fetching). In case of
future replica fetching from the local replica, if local replica becomes the
leader of the partition, the next fetch from future replica fails with
FENCED_LEADER_EPOCH and fetching from future replica is stopped until the next
leader change.
Proposed solution: on local replica leader change, future replica should
"become a follower" again, and go through the truncation phase. Or we could
optimize it, and just update partition state of the future replica to reflect
the updated current leader epoch.
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