一、出现这个错误，先看看DN是不是正常启动并与NN通信，使用如下命令：
sudo -u hdfs hadoop dfsadmin -report
二、如果DN已经正常启动，则要hdfs-site.xml文件dfs.replication配置是否大于DN数量，
三、如果问题还没有解决，则要检查iptables（开放DN 50010和NN 8020端口）是否正常。
heipark
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伍大都督：
解释太到位了，感谢分享
理解Linux系统中的load average（图文版） -
rfjian123：
非常感谢，用你的方法解决了问题。
Server sent unexpected return value (403 Forbidden) in response to OPTIONS -
yuhaifei12：
今天遇到同样的问题了。设置的是每分钟执行一次。结果发现每分钟执 ...
解决Linux下crontab同一时间重复执行问题 -
BigBird2012：
想问一下，使用ExecutorService每次都要调用 sh ...
spring quartz使用多线程并发“陷阱” -
zhuqx1130：
有用，谢谢
解决Sublime Text 3中文显示乱码（tab中文方块）问题
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