[FLINK-25053] Document how to use the usrlib to load code in the user code class loader

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.14.0, 1.12.5, 1.13.3, 1.15.0
• Fix Version/s: 1.15.0
• Component/s: Documentation, Runtime / Coordination
• Labels: pull-request-available
• Assignee: Lijie Wang
• Reporter: Till Rohrmann
• Created: 25/Nov/21 08:55
• Updated: 23/Feb/22 02:40
• Resolved: 23/Feb/22 02:40

Description

With FLINK-13993 we introduced the usrlib directory that can be used to load code in the user code class loader. This functionality has not been properly documented so that it is very hard to use. I would suggest to change this so that our users can benefit from this cool feature.

Issue Links

• is caused by: FLINK-13993 Using FlinkUserCodeClassLoaders to load the user class in the perjob mode
• links to: GitHub Pull Request #18450