[ 
https://issues.apache.org/jira/browse/FLINK-15414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17135429#comment-17135429
 ] 

Robert Metzger commented on FLINK-15414:
----------------------------------------

https://dev.azure.com/apache-flink/apache-flink/_build/results?buildId=3477&view=logs&j=c5f0071e-1851-543e-9a45-9ac140befc32&t=684b1416-4c17-504e-d5ab-97ee44e08a20

{code}
org.apache.kafka.common.KafkaException: Socket server failed to bind to 
0.0.0.0:46169: Address already in use.
        at kafka.network.Acceptor.openServerSocket(SocketServer.scala:573)
        at kafka.network.Acceptor.<init>(SocketServer.scala:451)
        at 
kafka.network.SocketServer.kafka$network$SocketServer$$createAcceptor(SocketServer.scala:245)
        at 
kafka.network.SocketServer$$anonfun$createDataPlaneAcceptorsAndProcessors$1.apply(SocketServer.scala:215)
        at 
kafka.network.SocketServer$$anonfun$createDataPlaneAcceptorsAndProcessors$1.apply(SocketServer.scala:214)
        at 
scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
        at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:48)
        at 
kafka.network.SocketServer.createDataPlaneAcceptorsAndProcessors(SocketServer.scala:214)
        at kafka.network.SocketServer.startup(SocketServer.scala:114)
        at kafka.server.KafkaServer.startup(KafkaServer.scala:253)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestEnvironmentImpl.getKafkaServer(KafkaTestEnvironmentImpl.java:425)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestEnvironmentImpl.prepare(KafkaTestEnvironmentImpl.java:132)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestBase.startClusters(KafkaTestBase.java:142)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestBase.startClusters(KafkaTestBase.java:131)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestBase.prepare(KafkaTestBase.java:100)
        at 
org.apache.flink.streaming.connectors.kafka.KafkaTestBase.prepare(KafkaTestBase.java:92)
        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.RunBefores.evaluate(RunBefores.java:24)
        at 
org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
        at org.junit.rules.ExternalResource$1.evaluate(ExternalResource.java:48)
        at org.junit.rules.RunRules.evaluate(RunRules.java:20)
        at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
        at 
org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
        at 
org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
        at 
org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
        at 
org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
        at 
org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
Caused by: java.net.BindException: Address already in use
        at sun.nio.ch.Net.bind0(Native Method)
        at sun.nio.ch.Net.bind(Net.java:433)
        at sun.nio.ch.Net.bind(Net.java:425)
        at 
sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:220)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:85)
        at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:78)
        at kafka.network.Acceptor.openServerSocket(SocketServer.scala:569)
        ... 35 more


[ERROR] Errors: 
[ERROR]   
FlinkKafkaProducerITCase>KafkaTestBase.prepare:92->KafkaTestBase.prepare:100->KafkaTestBase.startClusters:131->KafkaTestBase.startClusters:142
 » Kafka
[ERROR]   
KafkaProducerExactlyOnceITCase.prepare:31->KafkaTestBase.prepare:92->KafkaTestBase.prepare:100->KafkaTestBase.startClusters:131->KafkaTestBase.startClusters:142
 » Kafka
[INFO] 
[ERROR] Tests run: 64, Failures: 0, Errors: 2, Skipped: 0

{code}

> KafkaITCase#prepare failed in travis
> ------------------------------------
>
>                 Key: FLINK-15414
>                 URL: https://issues.apache.org/jira/browse/FLINK-15414
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka, Tests
>    Affects Versions: 1.12.0
>            Reporter: Dian Fu
>            Priority: Major
>              Labels: test-stability
>
> The travis for release-1.9 failed with the following error:
> {code}
> org.apache.kafka.common.KafkaException: Socket server failed to bind to 
> 0.0.0.0:44867: Address already in use.
>       at 
> org.apache.flink.streaming.connectors.kafka.KafkaITCase.prepare(KafkaITCase.java:58)
> Caused by: java.net.BindException: Address already in use
>       at 
> org.apache.flink.streaming.connectors.kafka.KafkaITCase.prepare(KafkaITCase.java:58)
> {code}
> instance: [https://api.travis-ci.org/v3/job/629636116/log.txt]



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