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https://issues.apache.org/jira/browse/KAFKA-13686?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17501144#comment-17501144
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Antonio Ricardo Alexandre Brasil commented on KAFKA-13686:
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Hi John, how do you reproduce this?
> NullPointerException in Selector.pollSelectionKeys
> --------------------------------------------------
>
> Key: KAFKA-13686
> URL: https://issues.apache.org/jira/browse/KAFKA-13686
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.11.0.1
> Environment: Linux/Centos 7.6, Java JVM - 1.8.0_181
> Reporter: John Calcote
> Priority: Major
>
> Seeing repeated NPEs in Selector.pollSelectionKeys:
> {noformat}
> java.lang.NullPointerException: null
> at
> org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:353)
> ~[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:184)
> ~[kafka-clients-0.11.0.1.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureCoordinatorReady(AbstractCoordinator.java:217)
> ~[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}
> {noformat}
> void pollSelectionKeys(Iterable<SelectionKey> selectionKeys,
> boolean isImmediatelyConnected,
> long currentTimeNanos) {
> Iterator<SelectionKey> iterator = selectionKeys.iterator();
> while (iterator.hasNext()) {
> SelectionKey key = iterator.next();
> iterator.remove();
> KafkaChannel channel = channel(key);
> long channelStartTimeNanos = recordTimePerConnection ?
> time.nanoseconds() : 0;
> // register all per-connection metrics at once
> sensors.maybeRegisterConnectionMetrics(channel.id()); <----
> NPE HERE
> if (idleExpiryManager != null)
> idleExpiryManager.update(channel.id(), currentTimeNanos);
> try {
> ...
> {noformat}
> The only two possibilities are:
> # sensors is null
> # channel is null
> sensors is not likely in my mind - it's more likely that the attachment on
> the key is null, but I don't have enough background in kafka client code to
> determine why this might be.
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