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https://issues.apache.org/jira/browse/KAFKA-10302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165185#comment-17165185
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John Thomas commented on KAFKA-10302:
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[~enether] You've already started working on it ?
> Ensure thread-safe access to Partition#remoteReplicasMap
> --------------------------------------------------------
>
> Key: KAFKA-10302
> URL: https://issues.apache.org/jira/browse/KAFKA-10302
> Project: Kafka
> Issue Type: Bug
> Reporter: Stanislav Kozlovski
> Priority: Major
>
> A recent Jira (https://issues.apache.org/jira/browse/KAFKA-10301) exposed how
> easy it is to introduce nasty race conditions with the
> Partition#remoteReplicasMap data structure. It is a concurrent map which is
> modified inside a write lock but it is not always accessed through that lock.
> Therefore it's possible for callers to access an intermediate state of the
> map, for instance in between updating the replica assignment for a given
> partition.
> It would be good to ensure thread-safe access to the data structure in a way
> which makes it harder to introduce such regressions in the future
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