Re: Zookeeper Node strategy to pick up the leader?

[Flavio Junqueira]

Leader selection is not random, but based on the last transaction acknowledged. Peers vote for the one with highest zxid (server ids break ties) and leave election once they hear the same vote from a quorum. If everything goes well, a quorum supports the new leader and system is able to make progress.  -Flavio On Jul 24, 2011, at 10:02 PM, Chiku Singh wrote: Suppose I have 5 node configuration in the Zookeeper {1,2,3,4,5} Zookeeper says that a leader is elected when a majority of nodes vote for any given node then, the node having majority of nodes is selected as the leader. Zookeeper benchmark says that a leader election typically takes 200 ms. My question is how is the convergence achieved? Do all nodes start voting for the node 1 as the leader or they start selecting the leader randomly? If the appointment of leader is totally random then how does it ensure convergence or such fast rates of leader election? Thanks for the answer! Help appreciated! flavio junqueira   research scientist   f...@yahoo-inc.com direct +34 93-183-8828   avinguda diagonal 177, 8th floor, barcelona, 08018, es phone (408) 349 3300    fax (408) 349 3301