Attaching a large file (e.g. 300mb) via POST to http://jenkinsserver/job/job_name/buildWithParameters url creates upload_*.tmp files in /tmp directory of the master. These are not deleted automatically after their corresponding builds are completed or cancelled (if in queue). This causes disk space issues in our environment.

I think it would be better if there is a way to correlate the upload_*.tmp files to their corresponding job_name and queue_id (or any other persistent id) so that there's an easy but intelligent way to clean-up these files (e.g. using post-build). Currently these files can be cleaned up manually (risky for queued jobs) or by rebooting Jenkins server.