[FLINK-23022] Plugin classloader settings do not work as described

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Component/s: API / Core
• Assignee: Unassigned
• Reporter: Dawid Wysakowicz
• Created: 17/Jun/21 11:04
• Updated: 23/Jun/21 15:25
• Resolved: 23/Jun/21 14:10

Description

The options plugin.classloader.parent-first-patterns are documented as all patterns that are put there should be loaded from the Flink classloader instead of the plugin classloader.

However, the way they work is that they define a set of patterns allowed to be pulled from the parent classloader. The plugin classloader takes precedence in all cases. And a class can be loaded from the parent classloader only if it matches the pattern in one of the aforementioned options.