There are no datanodes in the cluster
2012-05-31 10:00
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问题：
hadoop启动后查看http://192.168.58.100:50070/显示信息：
There are no datanodes in the cluster
没有数据节点在集群中
发现，所有dataNode，都无法ping通masterNode，这是问题的关键。
原因是因为我配置虚拟机的时候，masterNode(192.168.58.128)与dataNode(192.168.68.131)在不同的网段
换成一个网段后，问题解决。
hadoop启动后查看http://192.168.58.100:50070/显示信息：
There are no datanodes in the cluster
没有数据节点在集群中
发现，所有dataNode，都无法ping通masterNode，这是问题的关键。
原因是因为我配置虚拟机的时候，masterNode(192.168.58.128)与dataNode(192.168.68.131)在不同的网段
换成一个网段后，问题解决。
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