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>> Does the processes read or propose the value ?

It does both, it first proposes by writing a sequential znode and then reads the children (all proposals are written under some parent znode). This is certainly assuming some experience with ZK, and I wonder if that's the problem. It was not the goal to go into a discussion of the ZooKeeper API, but I'm happy to clarify if this is what is preventing you from getting the point.

>> Not suppose to ? How do you ensure that ?

It is not supposed to in the sense that if this is implemented right, then the proposed values for each client won't change. The recipe guarantees it because it assumes that each client writes just once.

>> Sorry, but I fail to see what recipe you speak about.

I'm referring to these three steps: creating a sequential znode under a known parent, reading the children, picking the value in the znode with smallest sequence number.




Thanks for these explanations ! Things are much more clear now.

Indeed, I have no experience in programming zookeeper, even I use it a lot behind tools like kafka or storm.




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