Ma77Ball opened a new pull request, #57436:
URL: https://github.com/apache/spark/pull/57436
### What changes were proposed in this pull request?
Bind the Spark Connect server test harness to port 0 so the OS assigns a
free port,
instead of guessing `CONNECT_GRPC_BINDING_PORT + Random.nextInt(1000)`:
- `SparkConnectServerTest` starts the service on port 0 and reads the real
bound port
from `SparkConnectService.localPort` into `serverPort` (new `startService`
helper).
- `SparkConnectServiceKeepAliveSuite` restarts via a new `restartService`
helper that
rebinds to port 0 rather than reusing a fixed port.
- `RemoteSparkSession` obtains a free port from a throwaway
`ServerSocket(0)`.
### Why are the changes needed?
The random fixed port races other processes and parallel test JVMs for a
specific
port, causing intermittent `BindException`. Letting the OS pick a free port
removes
the race. This complements the SPARK-58094 follow-up (#57342), which only
narrowed
the stop/start-same-port window.
### Does this PR introduce _any_ user-facing change?
No. Test-only; production code is unchanged.
### How was this patch tested?
Existing Connect server and client-jvm suites. Both test modules compile;
Scala
line-length and ASCII lint pass.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Opus 4.8
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