A quorum means (n/2)+1 - In a 3 node cluster that is 2. So, if 2 servers are up you can achieve quorum.
> we need odd > numbers in order to form a quorum The "odd" in this formula refers to the number of configured servers not how many are running at a given time. That's the reasoning for quorum in the first place. Quorum I/O ensures that a majority of nodes is referenced for reads or writes (in ZooKeeper writes are what matter for quorum). -Jordan > On May 9, 2018, at 10:26 AM, Kaushal Shriyan <[email protected]> wrote: > > Hi, > > In a ensemble of 3 nodes with 1 leader and 2 followers, if the leader goes > down then two servers can elect a leader among themselves. But we need odd > numbers in order to form a quorum. I am confused. Please correct me if i am > understanding it wrong. > > Any help will be highly appreciable > > Best Regards, > > Kaushal
