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https://issues.apache.org/jira/browse/FLINK-36683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Leonard Xu reassigned FLINK-36683:
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Assignee: Runkang He
> Support metadata 'row_kind' virtual column for Mongo CDC Connector
> ------------------------------------------------------------------
>
> Key: FLINK-36683
> URL: https://issues.apache.org/jira/browse/FLINK-36683
> Project: Flink
> Issue Type: Improvement
> Components: Flink CDC
> Affects Versions: cdc-3.2.0
> Reporter: Runkang He
> Assignee: Runkang He
> Priority: Major
> Labels: pull-request-available
> Fix For: cdc-3.4.0
>
>
> 'row_kind' metadata is very useful in actual user scenarios, the two main
> scenarios are below:
> 1. Save all upstream messages: In this scenario, the downstream will save all
> message includes delete messages from upstream. To achieve this requirement,
> we should convert full changelogs to append only message, and need to use
> metadata row_kind to represent the changelog kind.
> 2. Ignore upstream delete messages: In this scenario, to save storage space,
> the upstream cdc source often deletes historical data regularly and only
> retains data within seven days. However, the business requires the downstream
> OLAP system to retain the full amount of historical data, so it is necessary
> to ignore the delete messages from source. A reasonable way is to use
> metadata row_kind to filter out these delete messages.
> So I think we should support 'row_kind' metadata in Mongo CDC Connector.
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