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https://issues.apache.org/jira/browse/KAFKA-4628?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16489168#comment-16489168
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Adam Bellemare commented on KAFKA-4628:
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[~guozhang] - Do you happen to know an estimate of the complexity of this
ticket? I would be willing to look into addressing it as I believe that it is
quite useful in cases where you need a gating pattern. If the left table is
very large and the right table is very small, repartitioning the left table on
the right's keys can lead to an unbounded size growth of the event value.
These use-cases are especially prevalent with migrations away from relational
database type data, using Kafka Connect or other CDC patterns. The highly
normalized data makes it difficult to use as events.
If anyone else can offer up an estimate of the complexity of this task I would
be very appreciative. I will do my own investigation too and hopefully come up
with something.
> Support KTable/GlobalKTable Joins
> ---------------------------------
>
> Key: KAFKA-4628
> URL: https://issues.apache.org/jira/browse/KAFKA-4628
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Affects Versions: 0.10.2.0
> Reporter: Damian Guy
> Priority: Major
>
> In KIP-99 we have added support for GlobalKTables, however we don't currently
> support KTable/GlobalKTable joins as they require materializing a state store
> for the join.
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