Ao Li created KAFKA-17394:
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Summary: Flaky test in
DefaultTaskExecutorTest.shouldSetUncaughtStreamsException
Key: KAFKA-17394
URL: https://issues.apache.org/jira/browse/KAFKA-17394
Project: Kafka
Issue Type: Bug
Reporter: Ao Li
Another flaky test caused by non-atomic operation in DefaultTaskExecutor.
Please use https://github.com/aoli-al/kafka/tree/KAFKA-249 this fork to
reproduce the failure. Command: ./gradlew :streams:test --tests
DefaultTaskExecutorTest.shouldSetUncaughtStreamsException
Exception:
{code}
org.opentest4j.AssertionFailedError: expected: <null> but was:
<org.apache.kafka.streams.processor.internals.ReadOnlyTask@1e469dfd>
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.AssertNull.failNotNull(AssertNull.java:50)
at org.junit.jupiter.api.AssertNull.assertNull(AssertNull.java:35)
at org.junit.jupiter.api.AssertNull.assertNull(AssertNull.java:30)
at org.junit.jupiter.api.Assertions.assertNull(Assertions.java:279)
at
org.apache.kafka.streams.processor.internals.tasks.DefaultTaskExecutorTest.shouldSetUncaughtStreamsException(DefaultTaskExecutorTest.java:254)
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}
The root cause is that the operation in DefaultTaskExecutor:unassignCurrentTask
is not atomic:
{code}
// This operation unblocks the verify statement in test
taskManager.unassignTask(currentTask, DefaultTaskExecutor.this);
final StreamTask retTask = currentTask;
// This operation sets the currentTask to null.
currentTask = null;
{code}
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