nandorKollar commented on code in PR #4487:
URL: https://github.com/apache/polaris/pull/4487#discussion_r3266950837
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runtime/service/src/test/java/org/apache/polaris/service/events/listeners/inmemory/InMemoryBufferEventListenerBufferSizeTest.java:
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@@ -97,4 +99,58 @@ void testProcessorFailureRecovery() {
sendAsync("test1", 10);
assertRows("test1", 10);
}
+
+ /**
+ * Regression coverage for the concurrent-{@code onNext} race on the
per-realm {@link
+ * UnicastProcessor} held by {@link InMemoryBufferEventListener#processors}.
+ *
+ * <p>The Reactive Streams specification (rule 1.3) requires {@code
onNext()} to be called
+ * sequentially, and Mutiny's {@code UnicastProcessor} relies on that
contract; concurrent {@code
+ * onNext()} invocations on the same processor can silently drop events. The
{@link
+ * InMemoryBufferEventListener#processEvent} method serializes those calls
via {@code
+ * synchronized(processor)}; this test exercises that path under deliberate
concurrency and
+ * asserts the expected number of events lands in the events table.
+ */
+ @Test
+ void testProcessEventIsThreadSafe() throws InterruptedException {
Review Comment:
It seems to me, that this test passes even when I don't apply the changes on
`InMemoryBufferEventListener.java`.
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