Ao Li created KAFKA-17402:
-----------------------------
Summary: Test failure:
DefaultStateUpdaterTest.shouldGetTasksFromRestoredActiveTasks expected: <2>
but was: <3>
Key: KAFKA-17402
URL: https://issues.apache.org/jira/browse/KAFKA-17402
Project: Kafka
Issue Type: Bug
Reporter: Ao Li
I saw a test failure caused by a concurrency issue in DefaultStateUpdater.
{code}
org.opentest4j.AssertionFailedError: expected: <2> but was: <3>
at
org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:151)
at
org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
at
org.junit.jupiter.api.AssertEquals.failNotEqual(AssertEquals.java:197)
at
org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:150)
at
org.junit.jupiter.api.AssertEquals.assertEquals(AssertEquals.java:145)
at org.junit.jupiter.api.Assertions.assertEquals(Assertions.java:531)
at
org.apache.kafka.streams.processor.internals.DefaultStateUpdaterTest.verifyGetTasks(DefaultStateUpdaterTest.java:1688)
at
org.apache.kafka.streams.processor.internals.DefaultStateUpdaterTest.shouldGetTasksFromRestoredActiveTasks(DefaultStateUpdaterTest.java:1517)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
{code}
To reproduce the failure, you may clone this fork
https://github.com/aoli-al/kafka/tree/KAFKA-92 and run `./gradlew :streams:test
--tests DefaultStateUpdaterTest.shouldGetTasksFromRestoredActiveTasks`
The root cause of the issue is that function
`DefaultStateUpdater::maybeCompleteRestoration` is not atomic.
{code}
// This code will unblock the `verifyRestoredActiveTasks` in
the test
addToRestoredTasks(task);
//If the test method resumes before the task is removed from
`updatingTasks`, the test will fail.
updatingTasks.remove(task.id());
{code}
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