hadoop错误：Does not contain a valid host:port authority

hadoop环境部署完，执行hdfs zkfc -formatZK命令时，提示如上图所示错误

错误内容：

[root@study_1_1 hadoop]# hdfs zkfc -formatZK
Exception in thread "main" java.lang.IllegalArgumentException: Does not contain a valid host:port authority: study_1_1:9000
    at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:213)
    at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:164)
    at org.apache.hadoop.net.NetUtils.createSocketAddr(NetUtils.java:153)
    at org.apache.hadoop.hdfs.DFSUtil.getAddressesForNameserviceId(DFSUtil.java:716)
    at org.apache.hadoop.hdfs.DFSUtil.getAddressesForNsIds(DFSUtil.java:685)
    at org.apache.hadoop.hdfs.DFSUtil.getAddresses(DFSUtil.java:667)
    at org.apache.hadoop.hdfs.DFSUtil.getHaNnRpcAddresses(DFSUtil.java:766)
    at org.apache.hadoop.hdfs.HAUtil.isHAEnabled(HAUtil.java:78)
    at org.apache.hadoop.hdfs.tools.DFSZKFailoverController.create(DFSZKFailoverController.java:120)
    at org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main(DFSZKFailoverController.java:177)

经调查结果是由于主机的hostname不合法，修改为不包含着‘.’ '/' '_'等非法字符。