[FLINK-21673] Add extension points to heap backend to read/write incremental snapshots

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 1.13.0
• Component/s: Runtime / State Backends
• Labels: pull-request-available
• Assignee: Roman Khachatryan
• Reporter: Roman Khachatryan
• Created: 08/Mar/21 18:29
• Updated: 21/Mar/21 20:00
• Resolved: 21/Mar/21 20:00

Description

For each state, incremental backend can create either incremental or full snapshot.

States of type PQ or nested tables are always fully snapshotted.

The goal is allow future incremental backend to:

1. distinguish between full/inc snapshots on recovery
2. read incremental snapshot

This ticket is only about changing the existing classes (providing extension points).

 

Optional goal: compatibility between backends.

Issue Links

• links to: GitHub Pull Request #15206