xmarker commented on pull request #17465:
URL: https://github.com/apache/flink/pull/17465#issuecomment-950160789


   @fapaul I have debug KafkaSinkITCase on my computer , I found the failure 
cause was due to SinkWriter.timestamp() is a negative number, when kafka 
producer serialize the record throws a runtime exception, and then flink task 
failover repeatedly, now i have fixed it and run KafkaSinkITCase no problem 
anymore. 


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