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https://issues.apache.org/jira/browse/KAFKA-4569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901556#comment-15901556
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Jason Gustafson commented on KAFKA-4569:
----------------------------------------
Sorry for the late response. If I understand correctly, the bug we've
identified is that the consumer's wakeup will be postponed to a later poll() if
we have fetch data available. The challenge fixing this is ensuring that we
don't increment the consumer's positions prior to raising the WakeupException
since that would effectively cause lost data. A straightforward option that
comes to mind is adding a {{hasFetchedRecords()}} method to {{Fetcher}} to be
able to check for fetched data without incrementing the position. We could also
add a {{hasPendingWakeup()}} or something to {{ConsumerNetworkClient}}. If a
wakeup is expected, then we can just call {{poll(0)}} to trigger it.
[~umesh9...@gmail.com] Are you still working on this?
> Transient failure in
> org.apache.kafka.clients.consumer.KafkaConsumerTest.testWakeupWithFetchDataAvailable
> ---------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-4569
> URL: https://issues.apache.org/jira/browse/KAFKA-4569
> Project: Kafka
> Issue Type: Sub-task
> Components: unit tests
> Reporter: Guozhang Wang
> Assignee: Umesh Chaudhary
> Labels: newbie
> Fix For: 0.11.0.0, 0.10.2.1
>
>
> One example is:
> https://builds.apache.org/job/kafka-pr-jdk8-scala2.11/370/testReport/junit/org.apache.kafka.clients.consumer/KafkaConsumerTest/testWakeupWithFetchDataAvailable/
> {code}
> Stacktrace
> java.lang.AssertionError
> at org.junit.Assert.fail(Assert.java:86)
> at org.junit.Assert.fail(Assert.java:95)
> at
> org.apache.kafka.clients.consumer.KafkaConsumerTest.testWakeupWithFetchDataAvailable(KafkaConsumerTest.java:679)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
> at
> org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
> at
> org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
> at
> org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
> at
> org.junit.rules.ExpectedException$ExpectedExceptionStatement.evaluate(ExpectedException.java:239)
> at org.junit.rules.RunRules.evaluate(RunRules.java:20)
> at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
> at
> org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
> at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
> at
> org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.runTestClass(JUnitTestClassExecuter.java:114)
> at
> org.gradle.api.internal.tasks.testing.junit.JUnitTestClassExecuter.execute(JUnitTestClassExecuter.java:57)
> at
> org.gradle.api.internal.tasks.testing.junit.JUnitTestClassProcessor.processTestClass(JUnitTestClassProcessor.java:66)
> at
> org.gradle.api.internal.tasks.testing.SuiteTestClassProcessor.processTestClass(SuiteTestClassProcessor.java:51)
> at sun.reflect.GeneratedMethodAccessor11.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
> at
> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
> at
> org.gradle.internal.dispatch.ContextClassLoaderDispatch.dispatch(ContextClassLoaderDispatch.java:32)
> at
> org.gradle.internal.dispatch.ProxyDispatchAdapter$DispatchingInvocationHandler.invoke(ProxyDispatchAdapter.java:93)
> at com.sun.proxy.$Proxy2.processTestClass(Unknown Source)
> at
> org.gradle.api.internal.tasks.testing.worker.TestWorker.processTestClass(TestWorker.java:109)
> at sun.reflect.GeneratedMethodAccessor10.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:35)
> at
> org.gradle.internal.dispatch.ReflectionDispatch.dispatch(ReflectionDispatch.java:24)
> at
> org.gradle.internal.remote.internal.hub.MessageHub$Handler.run(MessageHub.java:377)
> at
> org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
> at
> org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {code}
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