[jira] [Updated] (FLINK-28303) Kafka SQL Connector loses data when restoring from a savepoint with a topic with empty partitions

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-28303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated FLINK-28303:
-----------------------------------
    Labels: pull-request-available  (was: )

> Kafka SQL Connector loses data when restoring from a savepoint with a topic with empty partitions
> -------------------------------------------------------------------------------------------------
>
>                 Key: FLINK-28303
>                 URL: https://issues.apache.org/jira/browse/FLINK-28303
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>    Affects Versions: 1.14.4
>            Reporter: Robert Metzger
>            Priority: Major
>              Labels: pull-request-available
>
> Steps to reproduce:
> - Set up a Kafka topic with 10 partitions
> - produce records 0-9 into the topic
> - take a savepoint and stop the job
> - produce records 10-19 into the topic
> - restore the job from the savepoint.
> The job will be missing usually 2-4 records from 10-19.
> My assumption is that if a partition never had data (which is likely with 10 partitions and 10 records), the savepoint will only contain offsets for partitions with data. 
> While the job was offline (and we've written record 10-19 into the topic), all partitions got filled. Now, when Kafka comes online again, it will use the "latest" offset for those partitions, skipping some data.



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