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https://issues.apache.org/jira/browse/SPARK-54122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim reassigned SPARK-54122:
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Assignee: Dmytro Fedoriaka
> Improve the testing experience for TransformWithState
> -----------------------------------------------------
>
> Key: SPARK-54122
> URL: https://issues.apache.org/jira/browse/SPARK-54122
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Affects Versions: 4.1.0
> Reporter: Dmytro Fedoriaka
> Assignee: Dmytro Fedoriaka
> Priority: Minor
> Labels: pull-request-available
>
> Currently it's hard to write unit tests for user's implementation of
> StatefulProcessor used in TransformWithState. User either needs to test it by
> running actual streaming query, or they need to refactor business logic into
> a separate function (that will be called from handleInputRows), and write
> unit tests for that function.
>
> I propose to add a simple testing framework for TransformWithState that will
> allow users easily test their business logic inside StatefulProcessor.
>
> On high-level, it's a class TwsTester that takes StatefulProcessor and allows
> to feed in input rows and immediately returns what rows would be produced by
> TWS. It also allows to set and inspect state. This can be used in unit tests
> without having to run streaming query and it won't need RocksDB (it will use
> in-memory state store). I will start with implementing this for Scala users,
> potentially making it available for Python users later.
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