Handle an edge case of removing server #129
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* If `handle_join_leave_rpc_err` is called but `srv_to_leave_` is already set, that function is probably invoked by `handle_hb_timeout`. In such a case, the server to be removed does not respond while the leader already generated the log for the configuration change. We should abandon the peer entry from `peers_`.
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handle_join_leave_rpc_erris called butsrv_to_leave_isalready set, that function is probably invoked by
handle_hb_timeout.In such a case, the server to be removed does not respond while the
leader already generated the log for the configuration change.
We should abandon the peer entry from
peers_.