Grant Henke created KAFKA-3226:
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             Summary: Replicas collections should use List instead of Set in 
order to maintain order
                 Key: KAFKA-3226
                 URL: https://issues.apache.org/jira/browse/KAFKA-3226
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.9.0.0
            Reporter: Grant Henke
            Assignee: Grant Henke
             Fix For: 0.9.0.1


Found an issue where LeaderAndIsrRequest and UpdateMetadataRequest store the 
replicas in a Set. This potentially changes the order of the replicas list, 
which is important because the first replica is the "preferred" replica. 

The question is, do these requests need to go through a 
deprecation/compatibility cycle, or are they considered internal messages?



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