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https://issues.apache.org/jira/browse/FLINK-20205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17236965#comment-17236965
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Jark Wu commented on FLINK-20205:
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I created a pull request which can also fix this problem:
https://github.com/apache/flink/pull/14160
> CDC source shouldn't send UPDATE_BEFORE messages if the downstream doesn't
> need it
> ----------------------------------------------------------------------------------
>
> Key: FLINK-20205
> URL: https://issues.apache.org/jira/browse/FLINK-20205
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Jark Wu
> Assignee: Leonard Xu
> Priority: Major
> Fix For: 1.12.0
>
>
> Currently, the CDC source will always generate UPDATE_BEFORE and UPDATE_AFTER
> messages for update. However, many downstream operators don't need the
> UDPATE_BEFORE, e.g. temporal join and upsert sink. Currently,
> {{debezium-cdc-source => upsert-kafka}} will generate lots of tombstone
> messages, which is quite not efficient.
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