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Posted to issues@flink.apache.org by "Jeffrey Martin (Jira)" <ji...@apache.org> on 2019/09/14 21:27:00 UTC

[jira] [Created] (FLINK-14076) 'ClassNotFoundException: KafkaException' on Flink v1.9 w/ checkpointing

Jeffrey Martin created FLINK-14076:
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             Summary: 'ClassNotFoundException: KafkaException' on Flink v1.9 w/ checkpointing
                 Key: FLINK-14076
                 URL: https://issues.apache.org/jira/browse/FLINK-14076
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kafka
    Affects Versions: 1.9.0
            Reporter: Jeffrey Martin
         Attachments: error.txt

A Flink job that worked with checkpointing on a Flink v1.8.0 cluster fails on a Flink v1.9.0 cluster with checkpointing. It works on a Flink v1.9.0 cluster _without_ checkpointing. It is specifically _enabling checkpointing on v1.9.0_ that causes the JM to start throwing ClassNotFoundExceptions. Full stacktrace: [^error.txt]

The job reads from Kafka via FlinkKafkaConsumer and writes to Kafka via FlinkKafkaProducer.

The jobmanagers and taskmanagers are standalone.

The exception is being raised deep in some Flink serialization code, so I'm not sure how to go about stepping through this in a debugger. The issue is happening in an internal repository at my job, but I can try to get a minimal repro on GitHub if it's not obvious from the error message alone what's broken.



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