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The AlterIsr RPC proposed in KIP-497 is similar in structure to the RPC proposed here. In the case of AlterIsr, it is used by the leader to indicate ISR changes to the controller. Since only the leader has up-to-date ISR information, a follower cannot reliably use this RPC to communicate an ISR change to the controller. It would require significant changes to the AlterIsr KIP to support this use case.

LogDir specific RPCSpecific RPC for log dir failures

Another rejected approach was to add an RPC which mirrored the JSON payload used by the ZK workflow currently implemented. This was rejected in favor of a more generic RPC that could be used for other purposes in the future. It was also rejected to prevent "leaking" the notion of a log dir to the public API.

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