There are good use cases for it. If you have a cluster (or clusters) with many, many nodes running your application you need to be able to communicate changes/c

There are good use cases for it. If you have a cluster (or clusters) with many, many nodes running your application you need to be able to communicate changes/configurations to those nodes/applications. Zookeeper is really good at doing this because it itself is clustered (HA, redundant). Updating all of those nodes/applications manually is not a desirable thing, so you have the application call the zookeeper service to get those configuration changes. The problem I see often is that it's wedged into places for which it's absolutely overkill. As in clusters with less than a dozen nodes, no service level determining such a need, etc. - it's often just a shiny object for architects.