It's the cadence of the etcd read cycle chosen for kubernetes. They could do it ...

		zwischenzug on July 22, 2015 \| parent \| context \| favorite \| on: Kubernetes V1 Released It's the cadence of the etcd read cycle chosen for kubernetes. They could do it much faster, but I guess there are engineering tradeoffs based on the size of the cluster and the speed of the network.