Zookeeper 2.3

api

1. We recapped re the API.
2. Basically try to derive it yourself.
3. Next divide which ones are write vs read related.
4. Note that the read related contain a watch.
5. Note that the write related contain a version.

guarantees or promises

1. Next we guessed what are zookeeper promises
2. Why have these two promises
3. Why A-linearizable?

async vs sync

1. what part of the writing is async?
2. example is large configuration file
3. what does it mean to be pipelined and issued asynchronously
   1. when a client issues a change, when does the system respond back with an ack?

sync

1. typical exists(‘ready’, () -> get(‘conf’..)) should work
2. back channel communication can cause process to get(‘conf’) prematurely (i.e. before it is ready).
3. for these cases client can issue a sync
4. what happens on a sync?
   1. maybe enough to bring local server up to commit index

• zookeeper
• distributed system