Jason Gustafson 7ac06065f1 KAFKA-12161; Support raft observers with optional id (#9871) ... We would like to be able to use `KafkaRaftClient` for tooling/debugging use cases. For this, we need the localId to be optional so that the client can be used more like a consumer. This is already supported in the `Fetch` protocol by setting `replicaId=-1`, which the Raft implementation checks for. We just need to alter `QuorumState` so that the `localId` is optional. The main benefit of doing this is that it saves tools the need to generate an arbitrary id (which might cause conflicts given limited Int32 space) and it lets the leader avoid any local state for these observers (such as `ReplicaState` inside `LeaderState`). Reviewers: Ismael Juma <ismael@juma.me.uk>, Boyang Chen <boyang@confluent.io>		2021-01-15 14:10:17 -08:00
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main	KAFKA-12161; Support raft observers with optional id (#9871)	2021-01-15 14:10:17 -08:00
test	KAFKA-12161; Support raft observers with optional id (#9871)	2021-01-15 14:10:17 -08:00