Siyuan Chen created BEAM-12040:
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Summary: WriteFiles withRunnerDeterminedShardingUnbounded doesn't
work with session windows
Key: BEAM-12040
URL: https://issues.apache.org/jira/browse/BEAM-12040
Project: Beam
Issue Type: Improvement
Components: io-java-files
Reporter: Siyuan Chen
Currently the implementation of `withRunnerDeterminedShardingUnbounded` uses a
stateful DoFn to achieve the grouping and batching of the input elements, which
doesn't support session windows. One possible way is to add another GBK prior
to the stateful DoFn to first get session windows merged and reify the window
before invoking the sateful DoFn.
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