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https://issues.apache.org/jira/browse/SPARK-20883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16399930#comment-16399930
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jincheng commented on SPARK-20883:
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it is convenient to cherry pick to 2.2 without any changes.
> Improve StateStore APIs for efficiency
> --------------------------------------
>
> Key: SPARK-20883
> URL: https://issues.apache.org/jira/browse/SPARK-20883
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.2.0
> Reporter: Tathagata Das
> Assignee: Tathagata Das
> Priority: Major
> Fix For: 2.3.0
>
>
> Current state store API has a bunch of problems that causes too many
> transient objects causing memory pressure.
> - StateStore.get() returns Options which forces creation of Some/None objects
> for every get
> - StateStore.iterator() returns tuples which forces creation of new tuple for
> each record returned
> - StateStore.updates() requires the implementation to keep track of updates,
> while this is used minimally (only by Append mode in streaming aggregations).
> This can be totally removed.
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