Hadoop 格式化namenode錯誤：FATAL namenode.NameNode: Exception innamenode join

ERROR namenode.NameNode: java.io.IOException: Cannot create directory /export/home/dfs/name/current
ERROR namenode.NameNode: java.io.IOException: Cannot remove current directory: /usr/local/hadoop/hdfsconf/name/current
原因是 沒有設置 /usr/hadoop/tmp 的權限沒有設置， 將之改爲：

chown –R hadoop:hadoop /usr/hadoop/tmp

sudo chmod -R a+w /usr/local/hadoop

經測試有效