spuru9 opened a new pull request, #28538:
URL: https://github.com/apache/flink/pull/28538
## What is the purpose of the change
Backport of #27936 ([FLINK-39061]) to `release-2.3`. The cherry-pick is
clean (`git cherry-pick -x 59b5196e105`); the diff is identical to the merged
master commit.
`StateMachineExample` was inadvertently changed to use the State V2 async
API (`state.v2.ValueState`, `enableAsyncState()`, `asyncValue()`,
`asyncUpdate()`, `asyncClear()`), which requires the ForSt backend. ForSt is
still under development and does not yet support `CANONICAL` savepoints —
triggering one causes an `IllegalStateException` that crashes the job.
This PR rolls the example back to the v1 synchronous State API, which is GA,
works with all standard backends, and supports all savepoint formats including
`CANONICAL`.
## Brief change log
- Replace `state.v2.ValueState` / `ValueStateDescriptor` imports with the
v1 equivalents
- Remove `.enableAsyncState()` from the `keyBy` chain in
`StateMachineMapper`
- Rewrite `flatMap` to use synchronous `currentState.value()`, `update()`,
and `clear()` instead of `asyncValue().thenAccept(...)`, `asyncUpdate()`, and
`asyncClear()`
## Verifying this change
This change is manually verified.
- Reproduction: Confirmed that the original implementation fails
savepoints with `java.lang.IllegalStateException: ForStStateBackend does not
support CANONICAL savepoints` when deployed via the K8s Operator.
- Validation: Verified that rolling back to the State V1 API allows
successful savepoints using production-ready backends (e.g., RocksDB).
- Local Build: Passed `./mvnw compile -pl
flink-examples/flink-examples-streaming`.
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): no
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: no
- The serializers: no
- The runtime per-record code paths (performance sensitive): no
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
- The S3 file system connector: no
## Documentation
- Does this pull request introduce a new feature? no
- If yes, how is the feature documented? not applicable
---
##### Was generative AI tooling used to co-author this PR?
- [X] Yes (Claude Code)
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