[GitHub] [beam] johnjcasey commented on issue #22809: [Bug]: Python SDK gets stuck when using Unbounded PCollection in streaming mode on GroupByKey after ReadFromKafka on DirectRunner, FlinkRunner and DataflowRunner

[GitBox <gi...@apache.org>]

johnjcasey commented on issue #22809:
URL: https://github.com/apache/beam/issues/22809#issuecomment-1309137732

   Ok, I've dug into this quite a bit:
   1. It appears to be unrelated to underlying use of Kafka UnboundedSource v. Kafka SDF
   2. Data flows normally with no window+gbk
   3. with 
           | "Fixed window 5s" >> beam.WindowInto(window.FixedWindows(5))
           | "Group by key" >> beam.GroupByKey()
           data does not appear to flow normally, but will show up on a drain request to dataflow
   4. with 
          | "Fixed window 5s" >> beam.WindowInto(window.FixedWindows(5), trigger=Repeatedly(AfterProcessingTime()), accumulation_mode=AccumulationMode.ACCUMULATING)
          | "Group by key" >> beam.GroupByKey()
          Data appears to flow normally. This suggests there is some issue triggering in the default window, which may or may not be related to xlang


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