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https://issues.apache.org/jira/browse/SPARK-6462?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon resolved SPARK-6462.
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Resolution: Incomplete
> UpdateStateByKey should allow inner join of new with old keys
> -------------------------------------------------------------
>
> Key: SPARK-6462
> URL: https://issues.apache.org/jira/browse/SPARK-6462
> Project: Spark
> Issue Type: Improvement
> Components: DStreams
> Affects Versions: 1.3.0
> Reporter: Andre Schumacher
> Priority: Major
> Labels: bulk-closed
>
> In a nutshell: provide a (inner join) instead of a cogroup for
> updateStateByKey in StateDStream.
> Details:
> It is common to read data (saw weblog data) from a streaming source (say
> Kafka) and each time update the state of a relatively small number of keys.
> If only the state changes need to be propagated to a downstream sink then one
> could avoid filtering out unchanged state in the user program and instead
> provide this functionality in the API (say by adding a
> updateStateChangesByKey method).
> Note that this is related but not identical to:
> https://issues.apache.org/jira/browse/SPARK-2629
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