Hadoop installation Error

When installing Hadoop ha, format ZK, execute HDFS ZKFC–FORMATZK command error as follows:

16/09/08 20:41:53 INFO Zookeeper. Zookeeper:initiating Client connection, connectstring=>hddata1:2181,hddata2:2181,hddata3:2181 sessionTimeout= Watcher[email Protected]5dd308e3

16/09/08 20:41:53 FATAL Tools. Dfszkfailovercontroller:got a fatal error, exiting now

Java.net.UnknownHostException: >hddata1

At Java.net.Inet4AddressImpl.lookupAllHostAddr (Native Method)

At Java.net.inetaddress$1.lookupallhostaddr (inetaddress.java:901)

At Java.net.InetAddress.getAddressesFromNameService (inetaddress.java:1295)

At JAVA.NET.INETADDRESS.GETALLBYNAME0 (inetaddress.java:1248)

At Java.net.InetAddress.getAllByName (inetaddress.java:1164)

At Java.net.InetAddress.getAllByName (inetaddress.java:1098)

At Org.apache.zookeeper.client.statichostprovider.<init> (statichostprovider.java:61)

At Org.apache.zookeeper.zookeeper.<init> (zookeeper.java:445)

At Org.apache.zookeeper.zookeeper.<init> (zookeeper.java:380)

At Org.apache.hadoop.ha.ActiveStandbyElector.getNewZooKeeper (activestandbyelector.java:631)

At Org.apache.hadoop.ha.ActiveStandbyElector.createConnection (activestandbyelector.java:775)

At Org.apache.hadoop.ha.activestandbyelector.<init> (activestandbyelector.java:229)

At Org.apache.hadoop.ha.ZKFailoverController.initZK (zkfailovercontroller.java:350)

At Org.apache.hadoop.ha.ZKFailoverController.doRun (zkfailovercontroller.java:191)

At org.apache.hadoop.ha.zkfailovercontroller.access$000 (zkfailovercontroller.java:61)

At Org.apache.hadoop.ha.zkfailovercontroller$1.run (zkfailovercontroller.java:172)

At Org.apache.hadoop.ha.zkfailovercontroller$1.run (zkfailovercontroller.java:168)

At Org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal (securityutil.java:415)

At Org.apache.hadoop.ha.ZKFailoverController.run (zkfailovercontroller.java:168)

At Org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main (dfszkfailovercontroller.java:181)

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Hadoop installation Error