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https://issues.apache.org/jira/browse/KAFKA-5731?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Randall Hauch reassigned KAFKA-5731:
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Assignee: Randall Hauch
> Connect WorkerSinkTask out of order offset commit can lead to inconsistent
> state
> --------------------------------------------------------------------------------
>
> Key: KAFKA-5731
> URL: https://issues.apache.org/jira/browse/KAFKA-5731
> Project: Kafka
> Issue Type: Bug
> Components: KafkaConnect
> Reporter: Jason Gustafson
> Assignee: Randall Hauch
> Fix For: 1.0.0
>
>
> In Connect's WorkerSinkTask, we do sequence number validation to ensure that
> offset commits are handled in the right order
> (https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L199).
>
> Unfortunately, for asynchronous commits, the {{lastCommittedOffsets}} field
> is overridden regardless of this sequence check as long as the response had
> no error
> (https://github.com/apache/kafka/blob/trunk/connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerSinkTask.java#L284).
>
> Hence if we get an out of order commit, then the internal state will be
> inconsistent. To fix this, we should only override {{lastCommittedOffsets}}
> after sequence validation.
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