[NIFI-11126] ListenHTTP doesn't clean temporary files from multipart

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.19.1
• Fix Version/s: 1.20.0
• Component/s: Extensions
• Assignee: David Handermann
• Reporter: Michael W Moser
• Created: 01/Feb/23 17:37
• Updated: 02/Feb/23 19:15
• Resolved: 02/Feb/23 12:24

Description

When a multipart/form-data POST is received by ListenHTTP and the content is greater than the Multipart Read Buffer Size property, the content is written to a file on disk in "java.io.tmpdir".  These files are never removed, even after the JVM is shutdown.

To duplicate:

• Configure a ListenHTTP processor with Multipart Read Buffer Size property with a small value such as 1 KB.
• Configure an InvokeHTTP processor to POST files to ListenHTTP using multipart/form-data (the Request Multipart Form-Data Name property)
• Configure a GenerateFlowFile processor to send a few files of size > 1 KB to InvokeHTTP

Observe the java.io.tmpdir (typically /tmp on Linux) has files named MultiPart3098281529241123731, MultiPart8577800175462397766, etc

Issue Links

• links to: GitHub Pull Request #6915