// :: FATAL namenode.NameNode: Failed to start namenode.

org.apache.hadoop.hdfs.qjournal.client.QuorumException: Unable to check if JNs are ready for formatting.  successful responses:

192.168.1.114:: false

 exceptions thrown:

192.168.1.113:: No Route to Host from  node1/192.168.1.111 to node3: failed on socket timeout exception: java.net.NoRouteToHostException: No route to host; For more details see:  http://wiki.apache.org/hadoop/NoRouteToHost

    at org.apache.hadoop.hdfs.qjournal.client.QuorumException.create(QuorumException.java:)

    at org.apache.hadoop.hdfs.qjournal.client.QuorumCall.rethrowException(QuorumCall.java:)

    at org.apache.hadoop.hdfs.qjournal.client.QuorumJournalManager.hasSomeData(QuorumJournalManager.java:)

    at org.apache.hadoop.hdfs.server.common.Storage.confirmFormat(Storage.java:)

    at org.apache.hadoop.hdfs.server.namenode.FSImage.confirmFormat(FSImage.java:)

    at org.apache.hadoop.hdfs.server.namenode.NameNode.format(NameNode.java:)

    at org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:)

    at org.apache.hadoop.hdfs.server.namenode.NameNode.main(NameNode.java:)

// :: INFO util.ExitUtil: Exiting with status

报错内容如上，在格式化namenode时报错，系统为centos7

原因：关闭防火墙时用的service iptables stop

解决方法：使用命令  systemctl stop firewalld 来关闭防火墙

再次格式化namenode，成功。

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