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https://issues.apache.org/jira/browse/FLINK-21191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kurt Young reassigned FLINK-21191:
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Assignee: Shengkai Fang
> Support reducing buffer for upsert-kafka sink
> ---------------------------------------------
>
> Key: FLINK-21191
> URL: https://issues.apache.org/jira/browse/FLINK-21191
> Project: Flink
> Issue Type: New Feature
> Components: Connectors / Kafka, Table SQL / Ecosystem
> Reporter: Jark Wu
> Assignee: Shengkai Fang
> Priority: Major
> Fix For: 1.13.0
>
>
> Currently, if there is a job agg -> filter -> upsert-kafka, then upsert-kafka
> will receive -U and +U for every updates instead of only a +U. This will
> produce a lot of tombstone messages in Kafka. It's not just about the
> unnecessary data volume in Kafka, but users may processes that trigger side
> effects when a tombstone records is ingested from a Kafka topic.
> A simple solution would be add a reducing buffer for the upsert-kafka, to
> reduce the -U and +U before emitting to the underlying sink. This should be
> very similar to the implementation of upsert JDBC sink.
> We can even extract the reducing logic out of the JDBC connector and it can
> be reused by other connectors.
> This should be something like `BufferedUpsertSinkFunction` which has a
> reducing buffer and flush to the underlying SinkFunction
> once checkpointing or buffer timeout. We can put it in `flink-connector-base`
> which can be shared for builtin connectors and custom connectors.
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