[HADOOP-1961] -get, -copyToLocal fail when single filename is passed

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 0.14.1
• Fix Version/s: 0.14.2, 0.15.0
• Assignee: Raghu Angadi
• Reporter: Koji Noguchi
• Created: 27/Sep/07 23:33
• Updated: 08/Jul/09 16:42
• Resolved: 05/Oct/07 00:09

Description

In 0.14.1 and in trunk, when I try

% hadoop dfs -get /user/knoguchi/aaa aaa

get: Failed to rename tmp file to local destination "aaa". Remote source file "/user/knoguchi/aaa" is saved to "/tmp/_copyToLocal_aaa30478".

This works.

% hadoop dfs -get /user/knoguchi/aaa ./aaa

or

% hadoop dfs -get /user/knoguchi/aaa /home/knoguchi/aaa

My guess. With change in HADOOP-1292, it now creates a tmp file when -copyToLocal.
When destination path is passed without any directory, tmp file is created under '/tmp'. Otherwise, it uses the same directory as the destination path.

In Java API for File.renameTo,
http://java.sun.com/javase/6/docs/api/java/io/File.html#renameTo(java.io.File)
it says
" The rename operation might not be able to move a file from one filesystem to another",

so renameTo call from /tmp/_tmpfile to /home/knoguchi can fail.