Dustin Cote created KAFKA-5718:
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             Summary: Better document what LogAppendTime means
                 Key: KAFKA-5718
                 URL: https://issues.apache.org/jira/browse/KAFKA-5718
             Project: Kafka
          Issue Type: Improvement
          Components: documentation
    Affects Versions: 0.11.0.0
            Reporter: Dustin Cote
            Priority: Trivial


There isn't a good description of LogAppendTime in the documentation. It would 
be nice to add this in somewhere to say something like:

LogAppendTime is some time between when the partition leader receives the 
request and before it writes it to it's local log. 

There are two important distinctions that trip people up:
1) This timestamp is not when the consumer could have first consumed the 
message. This instead requires min.insync.replicas to have been satisfied.
2) This is not precisely when the leader wrote to it's log, there can be delays 
along the path between receiving the request and writing to the log.



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