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https://issues.apache.org/jira/browse/FLINK-12448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Slotterback closed FLINK-12448.
-------------------------------------
Resolution: Duplicate
> FlinkKafkaProducer late closure after class loader
> --------------------------------------------------
>
> Key: FLINK-12448
> URL: https://issues.apache.org/jira/browse/FLINK-12448
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka
> Affects Versions: 1.7.2
> Reporter: Chris Slotterback
> Priority: Major
>
> During job failure/restart, FlinkKafkaProducer configured with
> Semantic.EXACTLY_ONCE fails to disconnect properly do to a
> NoClassDefFoundError:
> {noformat}
> java.lang.NoClassDefFoundError: org/apache/kafka/clients/NetworkClient$1
> at
> org.apache.kafka.clients.NetworkClient.processDisconnection(NetworkClient.java:658)
> at
> org.apache.kafka.clients.NetworkClient.handleDisconnections(NetworkClient.java:805)
> at org.apache.kafka.clients.NetworkClient.poll(NetworkClient.java:520)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:226)
> at org.apache.kafka.clients.producer.internals.Sender.run(Sender.java:163)
> at java.lang.Thread.run(Thread.java:748){noformat}
>
> This begins a restart loop where the job never recovers properly. This is
> reproducible only with EXACTLY_ONCE semantic, AT_LEAST_ONCE properly
> disconnects and restarts without error.
> This issue is described in FLINK-10455, but has been since marked as Fixed,
> but still reproducible.
>
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