Daniel Qian created KAFKA-6620:

             Summary: Documentation about "exactly_once" doesn't mention 
                 Key: KAFKA-6620
                 URL: https://issues.apache.org/jira/browse/KAFKA-6620
             Project: Kafka
          Issue Type: Bug
          Components: documentation, streams
            Reporter: Daniel Qian

Documentation about "processing.guarantee" says:
{quote}The processing guarantee that should be used. Possible values are 
{{at_least_once}}(default) and {{exactly_once}}. Note that exactly-once 
processing requires a cluster of at least three brokers by default what is the 
recommended setting for production; *for development you can change this, by 
adjusting broker setting* 
If one only set *transaction.state.log.replication.factor=1* but leave 
*transaction.state.log.min.isr* with default value (which is 2) the Streams 
Application will break.

Hope you guys modify the doc, thanks.

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