could only be written to 0 of the 1 minReplication nodes.

问题描述：

could only be written to 0 of the 1 minReplication nodes. There are 2 datanode(s) running and 2 node(s) are excluded in this operation.

解决方案：

原因有两种：

（1）namenode节点与其他datanode节点的VERSION中的clusterID的值不一致。

方法：删除所有节点（包括namenode）节点的hdfs-site.xml中dfs.namenode.name.dir中指定的文件夹即name和data文件夹，然后使用hadoop namenode –format命令重新格式化各个节点。

（2）有节点的防火墙未关闭

方法：使用命令：

systemctl stop firewalld.service

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