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https://issues.apache.org/jira/browse/KAFKA-15332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17927543#comment-17927543
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Calvin Liu commented on KAFKA-15332:
------------------------------------

[~stanislavkozlovski] 4.0 only carries part 1 which enhances data safety when 
no unclean leader election is needed. Typical use cases are network 
partitioning, performance-degraded leaders and clean shutdown replica.

For part 2, it is planned to be implemented this year. 

> Eligible Leader Replicas
> ------------------------
>
>                 Key: KAFKA-15332
>                 URL: https://issues.apache.org/jira/browse/KAFKA-15332
>             Project: Kafka
>          Issue Type: New Feature
>            Reporter: Calvin Liu
>            Assignee: Calvin Liu
>            Priority: Major
>
> A root ticket for the KIP-966
> The KIP has accepted 
> [https://cwiki.apache.org/confluence/display/KAFKA/KIP-966%3A+Eligible+Leader+Replicas]
> The delivery is divided into 2 parts, ELR and unclean recovery.



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