Hi! Seems like it's possible that NuRaft will concurrently run both methods (gdb trace https://gist.github.com/alesapin/973313f4d89f76634b4b1dd7e653e8ff). My code was node ready for this and I've got a deadlock :)

Is it expected behavior? Of course, I'll fix my code, but maybe it would be simpler to manage this on the NuRaft side? Both create and save snapshot methods write data to disk. In my case, it's not a problem, but I can imagine cases when it possibly can be painful.