Portable runners should be able to issue checkpoints to Splittable DoFn
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new feature
P2
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- Java
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Description
To execute unbounded Splittable DoFn over fnapi in streaming mode properly, portable runners should issue split(ProcessBundleSplitRequest with fraction_of_remainder \> 0) or simply checkpoint(ProcessBundleSplitRequest with fraction_of_remainder \== 0) to SDK regularly to make current bundle finished processing instead of running forever.
Imported from Jira [BEAM-11998](https://issues.apache.org/jira/browse/BEAM-11998). Original Jira may contain additional context.
Reported by: boyuanz.
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