Hi Lei, I think you might be confusing Leader Election within ZooKeeper itself with electing a leader for your application? Is that so?
Leader Election within ZooKeeper is totally internal to zookeeper service and is not visible to applications. I am little confused, what your problem statement is? Can you please explain it from the view point of your application? Thanks mahadev On 4/30/10 12:45 PM, "Lei Gao" <l...@linkedin.com> wrote: > Hi Ted, > > I 100% agree with what you said. But my question is more about what if my > zookeeper service cluster is partitioned from a majority of nodes in my USER > CLUSTER. In this case, the majority nodes in one network partition can¹t > select a new leader because zookeeper is out of reach. > > Another example will be that if there is an asymmetric network failure where a > majority of nodes from the USER CLUSTER can¹t reach the leader while the > zookeeper still can. How does zookeeper handle such situation? > > Thanks, > > Lei > > On 4/30/10 12:24 PM, "Ted Dunning" <ted.dunn...@gmail.com> wrote: > > There are a variety of situations that can trigger a new leader election and a > few that can cause the cluster to be unable to elect a new leader. Isolation > of just the leader is one of the situations that will cause a new leader > election. Isolation of nodes into groups smaller than the quorum will result > in the cluster freezing. > > On Fri, Apr 30, 2010 at 11:56 AM, Lei Gao <l...@linkedin.com> wrote: > Hi, > > I have a general question on how zookeeper can maintain its view of the user > cluster (that zookeeper manages) that is consistent with the nodes in the user > cluster. In other words, when zookeeper considers the current leader is > unavailable, does it really guarantee that a majority of nodes in the user > cluster can¹t reach the current leader? The same question applies to the > membership service as well. Because the zookeeper can be partitioned from a > majority of the nodes in the user cluster. How does the zookeeper handle > situations like this? > > Thanks, > > Lei > >
