hadoop搭建异常 /tmp/hadoop-root/mapred/system/jobtracker.info could only be replicated to 0 nodes, inste
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/tmp/hadoop-root/mapred/system/jobtracker.info could only be replicated to 0 nodes, instead of 1
java.net.NoRouteToHostException: No route to host
在hadoop集群中使用copyFromLocal命令的时候发生错误，识别不到datanode节点，重新初始化也没有用，此时删除临时文件夹下的所有文件，关闭iptables， /etc/init.d/iptables stop，再重新格式化，问题解决！
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