MartijnVisser opened a new pull request, #28379:
URL: https://github.com/apache/flink/pull/28379
## What is the purpose of the change
`RescaleTimelineITCase.testRescaleTerminatedByResourceRequirementsUpdated`
is flaky on slow CI. It asserts that the second `updateJobResourceRequirements`
RPC terminates the in-progress rescale started by the first update with
terminal reason `RESOURCE_REQUIREMENTS_UPDATED`. That setter is a no-op once
the rescale is already terminated. With the short cooldown (100 ms) and
resource-stabilization (50 ms) timeouts shared by the parameterized
configuration, the `DefaultStateTransitionManager` re-enters Idling and
terminates the rescale with `NO_RESOURCES_OR_PARALLELISMS_CHANGE` before the
second update is processed on a slow machine, producing the flaky assertion
failure. This is a test-side timing assumption, not a product bug.
## Brief change log
- For this case only, rebuild the fixture cluster in place with widened
cooldown/stabilization (60 s) so the in-progress rescale stays alive across the
single synchronous RPC round trip between the two updates.
- The shared parameterized configuration used by the other cases is left
untouched; the disabled-history parameter is skipped up front so it does not
pay for a cluster rebuild it never asserts on.
## Verifying this change
Existing assertions are unchanged. Verified by running
`testRescaleTerminatedByResourceRequirementsUpdated` repeatedly in a loop
locally without failure.
## 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 Opus 4.8 (1M context))
Generated-by: Claude Opus 4.8 (1M context)
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