`hadoop dfs` 和 `hadoop fs` 之间的区别 [英] Difference between `hadoop dfs` and `hadoop fs`

问题描述

我看到了 dfs 命令，然后去了文档，但我无法理解.
在我看来 fs 和 dfs 的工作方式类似.有人给出确切的区别吗?

I saw the dfs command, then went to the documentation but I am unable to understand.
In my point of view fs and dfs working similar. Any one give exact difference?

推荐答案

你可以在 $HADOOP_HOME/bin/hadoop 中看到两个命令(hadoop fs & hadoop dfs)的定义

You can see definitions of the two commands (hadoop fs & hadoop dfs) in $HADOOP_HOME/bin/hadoop

...
elif [ "$COMMAND" = "datanode" ] ; then
  CLASS='org.apache.hadoop.hdfs.server.datanode.DataNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_DATANODE_OPTS"
elif [ "$COMMAND" = "fs" ] ; then
  CLASS=org.apache.hadoop.fs.FsShell
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "dfs" ] ; then
  CLASS=org.apache.hadoop.fs.FsShell
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "dfsadmin" ] ; then
  CLASS=org.apache.hadoop.hdfs.tools.DFSAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
...

所以，它们完全相同.

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