Guozhang Wang created KAFKA-1762:
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             Summary: Set MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION default to 1
                 Key: KAFKA-1762
                 URL: https://issues.apache.org/jira/browse/KAFKA-1762
             Project: Kafka
          Issue Type: Bug
            Reporter: Guozhang Wang
            Assignee: Guozhang Wang


The new Producer client introduces a config for the max # of inFlight messages. 
When it is set > 1 on MirrorMaker, however, there is a risk for data loss even 
after KAFKA-1650.

Changes:
    1. Set max # of inFlight messages = 1 by default
    2. Leave comments explaining what the risks are of changing



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