周末机房断电，然后hadoop爆出如题的错误，解决方案就是关闭所有节点的防火墙，相关命令如下：

查看防火墙状态：

/etc/init.d/iptables status

暂时关闭防火墙：

/etc/init.d/iptables stop

禁止防火墙在系统启动时启动

/sbin/chkconfig --level  iptables off

重启iptables:

/etc/init.d/iptables restart

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