Is there a limit on the number of data nodes in ZooKeeper?

Yes, there is a limitation on the number of data nodes in ZooKeeper. By default, the maximum number of data nodes in ZooKeeper is set to one billion. This limitation is determined by ZooKeeper’s data structure and memory management policies. In practice, if more node data storage is needed, the capacity of data nodes can be expanded by increasing the number of nodes in the ZooKeeper cluster.