"Copy" Activity, to and from the same folder in Azure DataLake doesn't work

[Brondahl]

I need to rename a file, in an Azure DataLake. Since there's no "Rename" activity (which would be nice, :bats_eyelids:) I create a Copy activity set up with:

Source: MyLake\Path\File.txt Destination: MyLake\Path\NewFileName.txt Delete after Copy: true

When I run this, either in Debug mode or after Publishing, it reports success, but hasn't actually done anything. Neither the new file is created, nor the old one deleted. Viewing the Source & Destination UserProps of the activity in Published Activity run details confirms that everything is superficially correct.

If my targets are 2 different folders within the same DataLake, then it's fine. Indeed, if I chain 2 copy activities together sending Path\File.txt to NewPath\File.txt and then NewPath\File.txt to Path\NewFileName.txt then that works. It's only if the Paths are in the same folder that it breaks. Similarly, the same code, but using FileShare datasets, rather than Azure Data Lake datasets, works just fine.

FWIW I've tried having separate (but identical) Datasets & Linked Services to define the Source & Sink ... no effect.

[Brondahl]

Personally I'd say there are 2 (maybe 3?) bugs here, and 1 (Maybe 2?) missing features:

• Bug: Copy hasn't copied file.
• Bug: Copy reports success despite not having Copied
• ?Bug?: Copy does not delete old file, despite having been configured as such, and believing that it worked.
• Missing Feature: Ability to rename a file directly. (Shall I raise a separate issue for this?)
• ?Missing Feature?: I feel like I ought to be able to get more diagnostic feedback out of this somehow? Maybe not :)