[FLINK-20636] Require unaligned checkpoints to be disabled in StateFun applications

• Type: Task
• Status: Closed
• Priority: Blocker
• Resolution: Fixed
• Fix Version/s: statefun-2.2.2
• Component/s: Stateful Functions
• Labels: pull-request-available
• Assignee: Tzu-Li (Gordon) Tai
• Reporter: Tzu-Li (Gordon) Tai
• Created: 17/Dec/20 04:59
• Updated: 22/Dec/20 05:42
• Resolved: 22/Dec/20 05:42

Description

Due to how StateFun has feedback loops, with unaligned checkpoints a function dispatcher operator may receive a feedback checkpoint barrier (from other parallel subtasks that process the checkpoint barrier first) before it receives its own checkpoint barrier.

We need to further investigate how to properly support unaligned checkpointing in StateFun.
For the time being, we should strictly require aligned checkpointing for StateFun apps.

Issue Links

• links to: GitHub Pull Request #187