api We recapped re the API. Basically try to derive it yourself. Next divide which ones are write vs read related. Note that the read related contain a watch. Note that the write related contain a version. guarantees or promises Next we guessed what are zookeeper promises Why have these two promises Why A-linearizable? async vs sync what part of the writing is async? example is large configuration file what does it mean to be pipelined and issued asynchronously when a client issues a change, when does the system respond back with an ack?