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。

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