xuzq created KAFKA-5331:
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             Summary: MirrorMaker can't guarantee data is consistent between 
clusters
                 Key: KAFKA-5331
                 URL: https://issues.apache.org/jira/browse/KAFKA-5331
             Project: Kafka
          Issue Type: Improvement
          Components: core, tools
    Affects Versions: 0.10.2.1
            Reporter: xuzq
            Priority: Critical


MirrorMaker can't guarantee data is consistent between clusters although the 
topic partition Numbers are equal.

If we want to copy data from the old cluster to the new cluster, at the same 
time guaranteeing the data consistency, we have no choice but to code a 
MirrorMakerMessageHandler type of class manually to achieve it.

I think we can add a parameter to say whether or not you want to ensure the 
order, such as data.consistency and default value is true.

Of course, you can set data.consistency = false, if you don't want the data in 
order between clusters or some topic partition Numbers are not equal between 
clusters.



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