chia7712 commented on a change in pull request #9887:
URL: https://github.com/apache/kafka/pull/9887#discussion_r557431921
##########
File path:
streams/src/test/java/org/apache/kafka/streams/integration/AdjustStreamThreadCountTest.java
##########
@@ -230,4 +235,33 @@ public void
shouldAddAndRemoveStreamThreadsWhileKeepingNamesCorrect() throws Exc
waitForApplicationState(Collections.singletonList(kafkaStreams),
KafkaStreams.State.RUNNING, DEFAULT_DURATION);
}
}
+
+ @Test
+ public void testConcurrentlyAccessThreads() throws InterruptedException {
Review comment:
This test case can cause following exception if we don't apply this
patch.
```
org.apache.kafka.streams.integration.AdjustStreamThreadCountTest >
testConcurrentlyAccessThreads FAILED
java.lang.AssertionError: expected null, but
was:<java.util.ConcurrentModificationException>
at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.failNotNull(Assert.java:756)
at org.junit.Assert.assertNull(Assert.java:738)
at org.junit.Assert.assertNull(Assert.java:748)
at
org.apache.kafka.streams.integration.AdjustStreamThreadCountTest.testConcurrentlyAccessThreads(AdjustStreamThreadCountTest.java:264)
```
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