John Galt... who John Galt... who - 2 months ago 19
Java Question

Moving files in Hadoop using the Java API?

I want to move files around in HDFS using the Java APIs. I cannot figure out a way to do this. The FileSystem class only seems to want to allow moving to and from the local file system.. but I want to keep them in HDFS and move them there.

Am I missing something basic? The only way I can figure to do it is to read it from the input stream and write it back out... and then delete the old copy (yuck).

thanks

Answer

Use FileSystem.rename():

public abstract boolean rename(Path src, Path dst) throws IOException

Renames Path src to Path dst. Can take place on local fs or remote DFS.

Parameters:
src - path to be renamed
dst - new path after rename
Returns:
true if rename is successful
Throws:
IOException - on failure