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https://issues.apache.org/jira/browse/KAFKA-2894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15433790#comment-15433790
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ASF GitHub Bot commented on KAFKA-2894:
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Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/1771
> WorkerSinkTask doesn't handle rewinding offsets on rebalance
> ------------------------------------------------------------
>
> Key: KAFKA-2894
> URL: https://issues.apache.org/jira/browse/KAFKA-2894
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Affects Versions: 0.9.0.0
> Reporter: Ewen Cheslack-Postava
> Assignee: Liquan Pei
> Priority: Blocker
> Fix For: 0.10.1.0
>
>
> rewind() is only invoked at the beginning of each poll(). This means that if
> a rebalance occurs in the poll, it's feasible to get data that doesn't match
> a request to change offsets during the rebalance. I think the consumer will
> hold on to consumer data across the rebalance if it is reassigned the same
> offset, so there may already be data ready to be delivered. Additionally we
> may already have data in an incomplete messageBatch that should be discarded
> when the rewind is requested.
> While connectors that care about this (i.e. ones that manage their own
> offsets) can handle this correctly by tracking the offsets they're expecting
> to see, it's a hassle, error prone, an pretty unintuitive.
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