How to determine ZooKeeper version using command-line utilities

Determine ZooKeeper version using command-line utilities.

Determine ZooKeeper version details by checking runtime classes on a Kafka installation.

$ bin/kafka-run-class.sh org.apache.zookeeper.Version

3.5.9-83df9301aa5c2a5d284a9940177808c01bc35cef, built on 01/06/2021 20:03 GMT

Determine ZooKeeper version details by checking runtime classes on a standalone installation.

$ java -cp libs/zookeeper-3.5.9.jar org.apache.zookeeper.Version

3.5.9-83df9301aa5c2a5d284a9940177808c01bc35cef, built on 01/06/2021 20:03 GM

Determine ZooKeeper version by checking libraries.

$ ls /opt/kafka/kafka/libs/zookeeper-*.jar | sort | head -1

/opt/kafka/kafka/libs/zookeeper-3.5.9.jar

It is ZooKeeper 3.5.9.