spuru9 opened a new pull request, #29675:
URL: https://github.com/apache/flink/pull/29675
## What is the purpose of the change
`ChangelogCompatibilityITCase` fails on the release-1.20 nightlies for two
reasons: the checkpoint picked for the restore gets subsumed and deleted
(`FileNotFoundException ... chk-1`), and the JVM runs out of direct memory in
the Netty server, which shows up as `CheckpointCoordinator shutdown`.
## Brief change log
- Retain 10 checkpoints on the MiniCluster config, so the picked
checkpoint isn't subsumed while the job is cancelled
- Lower network memory from 64 MiB to 16 MiB per TM; each test case starts
11 TMs, and two cases' buffers together reached the 1536 MiB direct memory limit
## Verifying this change
Covered by the ITCase itself. Locally, peak direct memory went from 1535 of
1536 MiB (every run) to at most 1244 MiB over 40 runs, and a forced version of
the subsumption race fails without the change and passes with it. master has
the same code; happy to port it there too if wanted.
## 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 (please specify the tool below)
Generated-by: Claude Code (Opus 5.5)
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