There are 0 datanode(s) running and no node(s) are excluded in this operation.
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出现上述问题可能是格式化两次hadoop，导致没有datanode
解决办法是：找到hadoop安装目录下 hadoop-2.4.1/data/dfs/data里面的current文件夹删除
然后从新执行一下 hadoop namenode -format
再使用start-dfs.sh和start-yarn.sh 重启一下hadoop
用jps命令看一下就可以看见datanode已经启动了
0 0
- There are 0 datanode(s) running and no node(s) are excluded in this operation
- There are 0 datanode(s) running and no node(s) are excluded in this operation.
- There are 0 datanode(s) running and no node(s) are excluded in this operation
- There are 1 datanode(s) running and no node(s) are excluded in this operation.错误
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- There are no datanodes in the cluster
- There are no datanodes in the cluster
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