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https://issues.apache.org/jira/browse/KAFKA-2389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14662572#comment-14662572
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Jason Gustafson commented on KAFKA-2389:
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[~gwenshap] This only reason we've resisted adding a Future is that the
KafkaConsumer is not thread-safe, which means that the returned Future would
have to be confined to the same thread as the consumer. This might be a
surprising/confusing restriction for users.
> CommitType seems not necessary in commit().
> -------------------------------------------
>
> Key: KAFKA-2389
> URL: https://issues.apache.org/jira/browse/KAFKA-2389
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Jiangjie Qin
> Assignee: Jiangjie Qin
>
> The CommitType does not seem to be necessary in for commit(), it can be
> inferred from whether user passed in a callback or not.
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