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https://issues.apache.org/jira/browse/KAFKA-5329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16026049#comment-16026049
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Ismael Juma commented on KAFKA-5329:
------------------------------------

Are you sure that this is an issue [~becket_qin]? We rely on 
ControllerContext.partitionReplicaAssignment for the cases where the order 
matters and that does not use a Set. Also see 
https://github.com/apache/kafka/pull/900

> Replica list in the metadata cache on the broker may have different order 
> from zookeeper
> ----------------------------------------------------------------------------------------
>
>                 Key: KAFKA-5329
>                 URL: https://issues.apache.org/jira/browse/KAFKA-5329
>             Project: Kafka
>          Issue Type: Bug
>    Affects Versions: 0.10.2.1
>            Reporter: Jiangjie Qin
>              Labels: newbie
>             Fix For: 0.11.0.1
>
>
> It looks that in {{PartitionStateInfo}} we are storing the replicas in a set 
> instead of a Seq. This causes the replica order to be lost. In most case it 
> is fine, but in the context of preferred leader election, the replica order 
> determines which replica is the preferred leader of a partition. It would be 
> useful to make the order always be consistent with the order in zookeeper. 



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