[Bug]: Portable Spark 3 Streaming runner appears to have GBK bugs, cannot execute Redistribute composite correctly

[kennknowles]

What happened?

See e.g. https://ge.apache.org/s/fqs6k37b63yko/tests/task/:runners:spark:3:job-server:validatesPortableRunnerStreaming/details/org.apache.beam.sdk.transforms.RedistributeTest?top-execution=1

There is no output from the test.

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Priority: 2 (default)

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[kennknowles]

I notice that the portable Spark runner sickbays tests that would probably catch this too:

excludeTestsMatching 'org.apache.beam.sdk.transforms.GroupByKeyTest$WindowTests'

[kennknowles]

Ah and the equivalent ReshuffleTest