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https://issues.apache.org/jira/browse/KAFKA-3226?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15141858#comment-15141858
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ASF GitHub Bot commented on KAFKA-3226:
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Github user granthenke closed the pull request at:
https://github.com/apache/kafka/pull/900
> 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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