ZooKeeper constantly logs these messages. Adding logging.level.org.apache.zookeeper=WARN in application.properties does not suppress these error.
2017-08-17 12:55:41.951 INFO 1 --- [ XNIO-2 task-24] o.a.h.h.zookeeper.RecoverableZooKeeper : Process identifier=hconnection-0x187edfa9 connecting to ZooKeeper ensemble=localhost12181
2017-08-17 12:55:41.951 INFO 1 --- [ XNIO-2 task-24] org.apache.zookeeper.ZooKeeper : Initiating client connection, connectString=localhost:12181 sessionTimeout=60000 watcher=org.apache.hadoop.hbase.zookeeper.PendingWatcher@31b0624c
2017-08-17 12:55:41.954 INFO 1 --- [localhost:12181)] org.apache.zookeeper.ClientCnxn : Opening socket connection to server localhost:12181. Will not attempt to authenticate using SASL (unknown error)
2017-08-17 12:55:41.955 INFO 1 --- [localhost:12181)] org.apache.zookeeper.ClientCnxn : Socket connection established to localhost:12181, initiating session
2017-08-17 12:55:41.957 INFO 1 --- [localhost:12181)] org.apache.zookeeper.ClientCnxn : Session establishment complete on server localhost:12181, sessionid = 0x15deb0a0218257e, negotiated timeout = 60000
2017-08-17 12:55:41.962 INFO 1 --- [ XNIO-2 task-24] nectionManager$HConnectionImplementation : Closing master protocol: MasterService
2017-08-17 12:55:41.962 INFO 1 --- [ XNIO-2 task-24] nectionManager$HConnectionImplementation : Closing zookeeper sessionid=0x15deb0a0218257e
2017-08-17 12:55:41.965 INFO 1 --- [ XNIO-2 task-24] org.apache.zookeeper.ZooKeeper : Session: 0x15deb0a0218257e closed
2017-08-17 12:55:41.965 INFO 1 --- [-24-EventThread] org.apache.zookeeper.ClientCnxn : EventThread shut down
Add a logback.xml file on the classpath to solve this.
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<include resource="org/springframework/boot/logging/logback/base.xml"/>
<logger name="org.springframework" level="INFO"/>
<logger name="org.apache.zookeeper" level="WARN"/>
</configuration>