dalelane opened a new pull request, #29537:
URL: https://github.com/apache/flink/pull/29537
## What is the purpose of the change
MiniClusterJobEntryPointITCase was picking an available port number, and
giving that to the MiniCluster to bind to. This introduced a race condition. In
the window between identifying an available port, and starting a MiniCluster to
bind to it, something else could grab the port, resulting in a test failure
when the MiniCluster failed to start because the port it was trying to use was
not free.
## Brief change log
I've changed the minicluster config to use bind port 0 so it chooses a free
port by itself. This does add some complexity to the test, because it means I
have to go and discover what port it used after it's started to be able to
submit queries.
## Verifying this change
This is a fix to an ITCase test. Verified by running it repeatedly in a
constrained VM to simulate a constrained CI worker.
## 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
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##### Was generative AI tooling used to co-author this PR?
- [ ] Yes (please specify the tool below)
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