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https://issues.apache.org/jira/browse/FLINK-7931?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16654956#comment-16654956
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Tzu-Li (Gordon) Tai commented on FLINK-7931:
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[~till.rohrmann] I think it was a ticket opened specifically for the 1.3
branch, in which case it should still be relevant.
> FlinkKinesisProducer violates at-least-once guarantees (1.3 branch)
> -------------------------------------------------------------------
>
> Key: FLINK-7931
> URL: https://issues.apache.org/jira/browse/FLINK-7931
> Project: Flink
> Issue Type: Bug
> Components: Kinesis Connector
> Reporter: Tzu-Li (Gordon) Tai
> Assignee: Tzu-Li (Gordon) Tai
> Priority: Blocker
>
> Currently, there is no flushing of KPL outstanding records on checkpoints in
> the {{FlinkKinesisProducer}}. Likewise to the at-least-once issue on the
> Flink Kafka producer before, this may lead to data loss if there are
> asynchronous failing records after a checkpoint which the records was part of
> was completed.
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