Hi @Predrag Minovic , I deleted the file zookeeper.out, Use ambari start zookeeper, it show started, but use ./zkServer.sh status, it show "ZooKeeper JMX enabled by default Using config: /usr/hdp/2.3.4.0-3485/zookeeper/bin/../conf/zoo.cfg Error contacting service. It is probably not running." and the file zookeeper.out is not created. But use "./zkServer.sh start" show " Starting zookeeper ... already running as process 17976". ... View more