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https://issues.apache.org/jira/browse/SPARK-51891?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-51891:
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Labels: pull-request-available (was: )
> Squeeze the protocol of ListState GET / PUT / APPENDLIST for
> transformWithState in PySpark
> ------------------------------------------------------------------------------------------
>
> Key: SPARK-51891
> URL: https://issues.apache.org/jira/browse/SPARK-51891
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 4.1.0
> Reporter: Jungtaek Lim
> Priority: Major
> Labels: pull-request-available
>
> There are more opportunities to optimize the list state operations further in
> transformWithState in PySpark.
>
> * ListState.get() requires one more request to notice there is no further
> data to read. We can remove that request.
> ** This needs inlining response data to the proto message.
> * ListState.put() / ListState.appendList() requires one more request for
> every case. For small list, inlining the data into proto message should
> definitely help.
> * ListState.put() / ListState.appendList() moved from Arrow to custom
> protocol, but we realized pickled Python Row contains the schema information
> as string, which is larger than we anticipated - depending on the number of
> columns and the number of rows, Arrow could be efficient at some point.
>
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