Yi Hu created BEAM-14498:
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Summary: Python sdk's PeriodicImpulse generates a bounded
PCollection
Key: BEAM-14498
URL: https://issues.apache.org/jira/browse/BEAM-14498
Project: Beam
Issue Type: Bug
Components: sdk-java-core
Reporter: Yi Hu
See the dev mail list thread for details:
https://lists.apache.org/thread/ps3m0jc0ngqp1y2s0mv2n6hxhvgkr3vw
PeriodicImpluse transform in Java sdk generates unbounded
PCollection; while in Python sdk it generates bounded PCollection. The
latter case may cause issues in streaming.
Per Cham: Note that the primary use-case of PeriodicImpulse (according to the
design doc) was to
generate a fixed/bounded input that can slowly change over time but
changing over time dimension would make it unbounded.
Seems like we need to make python PeriodicImpulse generates an unbounded pcoll,
in alignment with Java implementation, and also make sure that the change does
not break the current implementation of its original use case (stream
enrichment problem).
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