ZooKeeper is a high-performance coordination service for distributed applications. - https://zookeeper.apache.org/doc/trunk/

Examples

The four letter words

"ZooKeeper responds to a small set of commands. Each command is composed of four letters. You issue the commands to ZooKeeper via telnet or nc, at the client port." - https://zookeeper.apache.org/doc/r3.4.8/zookeeperAdmin.html#sc_zkCommands

Lists brief details for the server and connected clients

echo 'stat' | nc localhost 2181

View a list of variables that could be used for monitoring the health of the cluster

echo 'mntr' | nc localhost 2181

List full details for the server

echo 'srvr' | nc localhost 2181

Links