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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