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Vespa ZooKeeper server interface
+
+Subdirectory zookeeper-server has code for the zookeeper server
+version we use by default, testing out new versions can be done by
+copying zookeeper-server dir to zookeeper-server-<version> and
+updating CMakeLists.txt and pom.xml in that directory and pom.xml and
+CMakeLists.txt in this directory. Selecting zookeeper server version
+is done with feature flag ZOOKEEPER_SERVER_VERSION.