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https://issues.apache.org/jira/browse/KAFKA-6459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin P. McCabe resolved KAFKA-6459.
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Resolution: Duplicate
Fix Version/s: 1.0.1
Duplicate of KAFKA-6260
> By (Re-)joining group StreamThread got NPE
> ------------------------------------------
>
> Key: KAFKA-6459
> URL: https://issues.apache.org/jira/browse/KAFKA-6459
> Project: Kafka
> Issue Type: Bug
> Components: streams
> Affects Versions: 1.0.0
> Reporter: Seweryn Habdank-Wojewodzki
> Priority: Major
> Fix For: 1.0.1
>
>
> We encouteres more instabilities in Kafka Streams.
> By (Re-)joining group StreamThread got NPE.
> {code}
> 2018-01-18 09:48:44 INFO AbstractCoordinator:336 - [Consumer
> clientId=kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1-consumer,
> groupId=kafka-endpoint] (Re-)joining group
> 2018-01-18 09:48:44 INFO StreamPartitionAssignor:341 - stream-thread
> [kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1-consumer]
> Assigned tasks to clients as
> \{c1e67c77-c0c8-413d-b0f2-31f22bdeae05=[activeTasks: ([0_0, 0_1, 0_2, 0_3,
> 0_4, 0_5, 0_6, 0_7, 0_8, 0_9]) standbyTasks: ([]) assignedTasks: ([0_0, 0_1,
> 0_2, 0_3, 0_4, 0_5, 0_6, 0_7, 0_8, 0_9]) prevActiveTasks: ([0_0, 0_1, 0_2,
> 0_3, 0_4]) prevAssignedTasks: ([0_0, 0_1, 0_2, 0_3, 0_4]) capacity: 1]}.
> 2018-01-18 09:48:44 INFO AbstractCoordinator:341 - [Consumer
> clientId=kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1-consumer,
> groupId=kafka-endpoint] Successfully joined group with generation 3950
> 2018-01-18 09:48:44 INFO ConsumerCoordinator:341 - [Consumer
> clientId=kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1-consumer,
> groupId=kafka-endpoint] Setting newly assigned partitions
> [my_internal_topic-6, my_internal_topic-5, my_internal_topic-8,
> my_internal_topic-7, my_internal_topic-9, my_internal_topic-0,
> my_internal_topic-2, my_internal_topic-1, my_internal_topic-4,
> my_internal_topic-3]
> 2018-01-18 09:48:44 INFO StreamThread:346 - stream-thread
> [kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1] State
> transition from PARTITIONS_REVOKED to PARTITIONS_ASSIGNED
> 2018-01-18 09:48:44 INFO StreamThread:351 - stream-thread
> [kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1]
> partition assignment took 149 ms.
> current active tasks: [0_0, 0_1, 0_2, 0_3, 0_4, 0_5, 0_6, 0_7, 0_8,
> 0_9]
> current standby tasks: []
> previous active tasks: [0_0, 0_1, 0_2, 0_3, 0_4]
> 2018-01-18 09:48:44 ERROR StreamThread:306 - stream-thread
> [kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1]
> Encountered the following error during processing:
> java.lang.NullPointerException: null
> at
> org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:436)
> ~[my-kafka-endpoint.jar:?]
> at org.apache.kafka.common.network.Selector.poll(Selector.java:395)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:460)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.poll(ConsumerNetworkClient.java:238)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.ConsumerNetworkClient.pollNoWakeup(ConsumerNetworkClient.java:275)
> ~[my-kafka-endpoint.jar:?]
> at
> org.apache.kafka.clients.consumer.internals.AbstractCoordinator$HeartbeatThread.run(AbstractCoordinator.java:934)
> ~[my-kafka-endpoint.jar:?]
> 2018-01-18 09:48:44 INFO StreamThread:346 - stream-thread
> [kafka-endpoint-c1e67c77-c0c8-413d-b0f2-31f22bdeae05-StreamThread-1] State
> transition from PARTITIONS_ASSIGNED to PENDING_SHUTDOWN
> {code}
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