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0923cb435f
There is a flaw in how the raft rpc endpoints are currently managed. The io_fiber in raft::server is supposed to first add new servers to rpc, then send all the messages and then remove the servers which have been excluded from the configuration. The problem is that the send_messages function isn't synchronous, it schedules send_append_entries to run after all the current requests to the target server, which can happen after we have already removed the server from address_map. In this patch the remove_server function is changed to mark the server_id as expiring rather than synchronously dropping it. This means all currently scheduled requests to that server will still be able to resolve the ip address for that server_id. Fixes: #11228 Closes #11748