[FLINK-23953] AvroSerializerSnapshot causes state migration even though the old and the new schemas are compatible

• Type: Bug
• Status: Open
• Priority: Not a Priority
• Resolution: Unresolved
• Affects Version/s: 1.13.2
• Component/s: API / Type Serialization System
• Labels: Avro AvroSchema auto-deprioritized-major auto-deprioritized-minor pull-request-available
• Assignee: Unassigned
• Reporter: Iaroslav Zeigerman
• Created: 24/Aug/21 22:56
• Updated: 19/Jan/24 08:21

Description

The problematic code is located here. Returning COMPATIBLE_AFTER_MIGRATION seems completely unnecessary and causes issues during schema evolution. The COMPATIBLE_AS_IS status should be returned instead. Even the comment right above the shared snippet suggests that:

                    // The new serializer would be able to read data persisted with *this*
                    // serializer, therefore no migration
                    // is required.

Issue Links

• links to: GitHub Pull Request #16973