If you have 1 cluster and it's very small, as you point out HBase isn't intense on ZK (yet) so using only 1 ZK is ok.
Another setup like we have here at stumbleupon is multiple clusters using the same quorum. In this case it makes sense to get 3 or 5 nodes and in our case the hardware is beefy enough so that they coexist with some slave processes. J-D 2010/2/12 Michał Podsiadłowski <podsiadlow...@gmail.com> > Hey all, > I was asking about minimum number of zookeepers and usually everybody was > saying odd number >=3. Are there any reasons for this. Have you encounter > any problems from single zookeeper? As far as know already hbase is doing > very very little operations using zookeeper so load on it is insignificant. > If I have only one master and one namenode i do have 2 SPOF so another one > is not a big deal. Currently we have 3 zookeepers running on xen os with > datanode/hregion on physical machine. > Can someone advice something? > > Thanks, > Michal >
