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From "Matthias J. Sax (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (KAFKA-5882) NullPointerException in StreamTask
Date Wed, 06 Dec 2017 21:11:00 GMT

    [ https://issues.apache.org/jira/browse/KAFKA-5882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280918#comment-16280918
] 

Matthias J. Sax commented on KAFKA-5882:
----------------------------------------

I just looked into this a little bit. One side remark: the following log statement is wrong.
This got fixed already. Just wanted to point it out.

{noformat}
2017-09-18 14:13:17 INFO  StreamThread:1248 - stream-thread [streamer-923cc4d5-22aa-40f2-95ff-0fbda292b346-StreamThread-1]
Created active task 13_5 with assigned partitions [a0291_topic-5]
{noformat}

We can see from the NPE below, that we actually failed creating the task.

> NullPointerException in StreamTask
> ----------------------------------
>
>                 Key: KAFKA-5882
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5882
>             Project: Kafka
>          Issue Type: Bug
>          Components: streams
>    Affects Versions: 0.11.0.0
>            Reporter: Seweryn Habdank-Wojewodzki
>
> It seems bugfix [KAFKA-5073|https://issues.apache.org/jira/browse/KAFKA-5073] is made,
but introduce some other issue.
> In some cases (I am not sure which ones) I got NPE (below).
> I would expect that even in case of FATAL error anythink except NPE is thrown.
> {code}
> 2017-09-12 23:34:54 ERROR ConsumerCoordinator:269 - User provided listener org.apache.kafka.streams.processor.internals.StreamThread$RebalanceListener
for group streamer failed on partition assignment
> java.lang.NullPointerException: null
>         at org.apache.kafka.streams.processor.internals.StreamTask.<init>(StreamTask.java:123)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.createStreamTask(StreamThread.java:1234)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread$TaskCreator.createTask(StreamThread.java:294)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread$AbstractTaskCreator.retryWithBackoff(StreamThread.java:254)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.addStreamTasks(StreamThread.java:1313)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.access$1100(StreamThread.java:73)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread$RebalanceListener.onPartitionsAssigned(StreamThread.java:183)
~[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.onJoinComplete(ConsumerCoordinator.java:265)
[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.joinGroupIfNeeded(AbstractCoordinator.java:363)
[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.internals.AbstractCoordinator.ensureActiveGroup(AbstractCoordinator.java:310)
[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.internals.ConsumerCoordinator.poll(ConsumerCoordinator.java:297)
[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.KafkaConsumer.pollOnce(KafkaConsumer.java:1078)
[myapp-streamer.jar:?]
>         at org.apache.kafka.clients.consumer.KafkaConsumer.poll(KafkaConsumer.java:1043)
[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.pollRequests(StreamThread.java:582)
[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.runLoop(StreamThread.java:553)
[myapp-streamer.jar:?]
>         at org.apache.kafka.streams.processor.internals.StreamThread.run(StreamThread.java:527)
[myapp-streamer.jar:?]
> 2017-09-12 23:34:54 INFO  StreamThread:1040 - stream-thread [streamer-3a44578b-faa8-4b5b-bbeb-7a7f04639563-StreamThread-1]
Shutting down
> 2017-09-12 23:34:54 INFO  KafkaProducer:972 - Closing the Kafka producer with timeoutMillis
= 9223372036854775807 ms.
> {code}



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