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https://issues.apache.org/jira/browse/FLINK-23875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17407260#comment-17407260
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Fabian Paul commented on FLINK-23875:
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I created a separate ticket to fix it for Flink 1.13
https://issues.apache.org/jira/browse/FLINK-24079
> ReducingUpsertSink can loose records during failover
> -----------------------------------------------------
>
> Key: FLINK-23875
> URL: https://issues.apache.org/jira/browse/FLINK-23875
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka, Table SQL / API
> Affects Versions: 1.14.0, 1.13.2
> Reporter: Fabian Paul
> Assignee: Fabian Paul
> Priority: Major
> Labels: pull-request-available
>
> When trying to rework the Table API Kafka connector to make it compatible
> with the new KafkaSink I noticed that currently the buffer which is used to
> reduce the update-before and update-after calls is not snapshotted which can
> result in data loss if the job fails while the buffer is not empty.
>
> Before 1.14 the equivalent class was called BufferedUpsertSinkFunction
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