向hadoop导入文件，报错
....
There are 0 datanode(s) running and no node(s) are excluded in this operation.
....
查看配置
$hadoop_home/hadoop/etc/hdfs-site.xml
<property>
<name>dfs.namenode.name.dir</name>
<value>file:/home/sparkuser/myspark/hadoop/hdfs/name</value>
</property>
<property>
对应目录下生成in_use.lock文件
解决
删除目录下的 current
There are 0 datanode(s) running and no node(s) are excluded in this operation.
原文：http://www.cnblogs.com/jeffry/p/6914010.html