vinodkc opened a new pull request, #57342:
URL: https://github.com/apache/spark/pull/57342
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### What changes were proposed in this pull request?
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When `SparkConnectService.stop()` is called, it shuts down the gRPC server
using `server.shutdownNow()`. However, `shutdownNow()` returns immediately
without waiting for the server to finish shutting down — meaning the OS port
the server was listening on may not be released yet.
If `start()` is called right after `stop()` on the same port (as several
tests in `SparkConnectServiceKeepAliveSuite` do), the bind can fail with a
`BindException` because the port is still held.
The fix: call `server.awaitTermination(30, TimeUnit.SECONDS)` after
`shutdownNow()`. This waits up to 30 seconds for the gRPC server to fully stop
and release the OS port, so any immediate `start()` that follows is guaranteed
to find the port free. The 30-second cap avoids an indefinite wait in case of
an unexpected hang during shutdown.
### Why are the changes needed?
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`SparkConnectServiceKeepAliveSuite` (introduced in #57202) contains three
tests that each call `SparkConnectService.stop()` immediately followed by
`SparkConnectService.start()` on the same port. Because `shutdownNow()` is
non-blocking, the port was not always free by the time `start()` tried to bind,
producing intermittent CI failures:
java.net.BindException: Failed to bind to address 0.0.0.0/0.0.0.0:15312:
Service 'org.apache.spark.sql.connect.service.SparkConnectService' failed
after 0 retries (starting from 15312)!
### Does this PR introduce _any_ user-facing change?
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No. `stop()` is not a public API. The added blocking wait is only observable
as a slightly longer stop() duration (bounded by in-flight gRPC request drain
time), which was already the case for the timeout-based overload.
### How was this patch tested?
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The existing `SparkConnectServiceKeepAliveSuite` tests exercise the
stop/start lifecycle. No new tests are needed — this is a one-line fix that
eliminates the race those tests were hitting.
### Was this patch authored or co-authored using generative AI tooling?
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Generated-by: Claude Sonnet 4.6
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