[FLINK-22964] Connector-base exposes dependency to flink-core.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.14.0, 1.13.1, 1.12.4
• Fix Version/s: 1.14.0, 1.12.5, 1.13.2
• Component/s: Connectors / Common
• Labels: classloading pull-request-available
• Release Note: Connectors do not transitively hold a reference to `flink-core` anymore. That means that a fat jar with a connector does not include `flink-core` with this fix.
• Assignee: Arvid Heise
• Reporter: Arvid Heise
• Created: 10/Jun/21 14:29
• Updated: 23/Sep/21 17:54
• Resolved: 30/Jun/21 07:46

Description

Connectors get shaded into the user jar and as such should contain no unnecessary dependencies to flink. However, connector-base is exposing `flink-core` which then by default gets shaded into the user jar. Except for 6MB of extra size, the dependency also causes class loading issues, when `classloader.parent-first-patterns` does not include `o.a.f`.

Fix is to make `flink-core` provided in `connector-base`.

Issue Links

• is caused by: FLINK-20098 Don't add flink-connector-files to flink-dist, make dependencies explicit
• links to: GitHub Pull Request #16322
• links to: GitHub Pull Request #16326
• links to: GitHub Pull Request #16327