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https://issues.apache.org/jira/browse/KAFKA-3664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15475944#comment-15475944
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Vahid Hashemian commented on KAFKA-3664:
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Fix was provided under
[KIP-70|https://cwiki.apache.org/confluence/display/KAFKA/KIP-70%3A+Revise+Partition+Assignment+Semantics+on+New+Consumer's+Subscription+Change].
> When subscription set changes on new consumer, the partitions may be removed
> without offset being committed.
> ------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-3664
> URL: https://issues.apache.org/jira/browse/KAFKA-3664
> Project: Kafka
> Issue Type: Bug
> Reporter: Jiangjie Qin
> Assignee: Vahid Hashemian
>
> When users are using group management, if they call consumer.subscribe() to
> change the subscription, the removed subscriptions will be immediately
> removed and their offset will not be commit. Also the revoked partitions
> passed to the ConsumerRebalanceListener.onPartitionsRevoked() will not
> include those partitions.
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