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Basically, if two processes attempt to append to the same key at the same time, is there any chance that one will ever overwrite the other?
e.g.:
Process 1 appends “a” to the key “k”
Process 2 appends “b” to the key “k”
Are we guaranteed to have two characters (either “ab” or “ba”) as the value after we perform these actions?
Yes, memcached does not do a read/write to append so concurrency is ensured