scwhittle opened a new pull request, #32044:
URL: https://github.com/apache/beam/pull/32044
This ensures that an SDF makes progress if the runner repeatedly attempts to
split the restriction before work has been claimed.
This affects the Dataflow Runner which attempts to split in streaming
pipelines after 5 seconds by default. If the SDF takes over 5 seconds to read
the first element and attempt to claim it, the split will occur first,
checkpointing the same restriction and the element will be dropped. On retry,
it will resume from the same restriction and this may repeat.
This matches the behavior of the java fnapi runner which didn't start the
split thread until the tryClaim was observed. Having the sdk ignore such split
requests seems better than requiring the runner to attempt to time the split
better as the sdf may be making progress just not returning any data yet to the
runner.
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