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Posted to issues@flink.apache.org by "Christopher Ng (JIRA)" <ji...@apache.org> on 2018/05/03 16:25:00 UTC

[jira] [Created] (FLINK-9295) FlinkKafkaProducer011 sometimes throws ProducerFencedExceptions when in EXACTLY_ONCE mode

Christopher Ng created FLINK-9295:
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             Summary: FlinkKafkaProducer011 sometimes throws ProducerFencedExceptions when in EXACTLY_ONCE mode
                 Key: FLINK-9295
                 URL: https://issues.apache.org/jira/browse/FLINK-9295
             Project: Flink
          Issue Type: Bug
          Components: Kafka Connector
    Affects Versions: 1.4.2
            Reporter: Christopher Ng


{{FlinkKafkaProducer011}} can throw {{ProducerFencedExceptions}} if multiple sinks are used within the same sub-task.  This can happen when chaining results in two different sinks in the same topology being chained into a single sub-task.

The problem is that {{TransactionIdsGenerator}} only takes into account the task name, the subtask index, the number of subtasks, and a couple of other things.  All the attributes are the same between different {{FlinkKafkaProducer011s}} within the same sub-task, so they get the same transaction ids and one of them ends up failing.



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