Github user uce commented on the issue:
https://github.com/apache/flink/pull/5331
I just tried it, re-uploading after deleting the directory **does not
work**. Good catch Stephan. :-)
@zentol: I found `HttpRequestHandler` which handles the uploads. The
handler assumes that the directory exists and the logic for creating the temp
directory is in `WebRuntimeMonitor`. We should consolidate this in a single
place (if no one else needs this directory).---
