[jira] [Created] (FLINK-12448) FlinkKafkaProducer late closure after class loader

["Chris Slotterback (JIRA)" <ji...@apache.org>]

Chris Slotterback created FLINK-12448:
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             Summary: 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


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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