[jira] [Created] (KAFKA-7378) Consumer poll hangs if broker shutdown while consumer attempting to connect.

["John Calcote (JIRA)" <ji...@apache.org>]

John Calcote created KAFKA-7378:
-----------------------------------

             Summary: Consumer poll hangs if broker shutdown while consumer attempting to connect.
                 Key: KAFKA-7378
                 URL: https://issues.apache.org/jira/browse/KAFKA-7378
             Project: Kafka
          Issue Type: Bug
          Components: consumer
    Affects Versions: 0.11.0.1
         Environment: Java JDK 8, Linux RedHat 7.5
            Reporter: John Calcote


I have an integration test that creates a Spring context, starting up the application. In the test's @Before method, I create a zookeeper and KafkaServer instance with available ephemeral service ports. The test's @After method shuts down these service instances. The Spring context registers a shutdown handler, which doesn't get called till after the @After method is run. This means my application's consumer polling loop doesn't detect a termination event until after the broker is gone. Here's what shows up in my log4j log:

 
{noformat}
2018-09-05 11:56:13.980,1819313073756610 {} DEBUG o.a.k.c.NetworkClient [hmdb-kafka-polling-thread] Initiating connection to node localhost:9092 (id: -1 rack: null)
2018-09-05 11:56:13.980,1819313074091635 {} DEBUG o.a.k.c.n.Selector [hmdb-kafka-polling-thread] Connection with localhost/127.0.0.1 disconnected
java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[?:1.8.0_171]
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[?:1.8.0_171]
at org.apache.kafka.common.network.PlaintextTransportLayer.finishConnect(PlaintextTransportLayer.java:50) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.common.network.KafkaChannel.finishConnect(KafkaChannel.java:95) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:361) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.common.network.Selector.poll(Selector.java:326) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:433) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:232) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:208) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:199) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.awaitMetadataUpdate(ConsumerNetworkClient.java:134) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:226) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:203) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:286) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1078) ~[kafka-clients-0.11.0.1.jar:?]
at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1043) ~[kafka-clients-0.11.0.1.jar:?]
{noformat}

This sequence continues forever because poll will not return and notice it's time to terminate my polling loop.



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