[FLINK-6600] Add key serializer's config snapshot to KeyedBackendSerializationProxy

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.3.0, 1.4.0
• Component/s: Runtime / State Backends
• Assignee: Tzu-Li (Gordon) Tai
• Reporter: Tzu-Li (Gordon) Tai
• Created: 16/May/17 13:20
• Updated: 18/May/17 14:39
• Resolved: 17/May/17 14:54

Description

Currently, only the key serializer is included in what's written for a keyed state backend in checkpoints. The namespace and state serializer already have their config snapshots included in the individual registered state's metainfo.

We should also include the configuration snapshot of the key serializer in KeyedBackendSerializationProxy so that we can also be flexible in allowing migration / transformation of the key in the future.

Issue Links

• links to: GitHub Pull Request #3925