DEPRECATED: Use of this script to execute hdfs command is deprecated.
本人安裝的hadoop版本是2.4.0的，但每次執行命令時都會顯示下面的信息
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hadoop dfs -ls . DEPRECATED: Use of this script to execute hdfs command is deprecated. Instead use the hdfs command for it. ls: `.': No such file or directory
原來從0.21.0版本以后，hadoop 命令換成了hdfs命令，上面的命令如同下面的命令：
hdfs dfs -ls // 這時就沒有錯誤了
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hdfs dfs -ls // Found 2 items drwxr-xr-x - hadoop supergroup 0 2014-08-29 21:30 /in drwx------ - hadoop supergroup 0 2014-08-29 15:03 /tmp
同樣：
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hadoop dfs -put ./input in DEPRECATED: Use of this script to execute hdfs command is deprecated. Instead use the hdfs command for it. put: `in': No such file or directory
改為：
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hdfs dfs -put input/README.txt /t
並且要使用絕對路徑必須以 / 頭 。好像Hadoop 里面也沒有工作目錄一說
如：
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hdfs dfs -mkdir test5 mkdir: `test5': No such file or directory
加上/ 就能成功
hadoop@VM_160_34_centos:/usr/local/hadoop-2.4.0> hdfs dfs -mkdir /test4