lostluck opened a new pull request, #32029:
URL: https://github.com/apache/beam/pull/32029
In very rare cases a transform, such as a flatten can be in a pipeline
without any real inputs.
Without inputs, nothing kicked off watermark processing, which then blocked
use of the empty flatten output as a side input, which blocked that transform
from executing.
This manifested as the upstream stage (the flatten), never getting watermark
refreshed, and therefore the downstream stage never being able to execute,
since the side input data from the upstream stage was never ready.
The solution in this PR is when a stage is added without inputs, it must be
part of the initial watermark refresh set. Further taken to keep this part of
the "impulse" set when a TestStream is involved in the Pipeline, since that
manipulates initial refreshes.
Additionally adds a line to the stuck pipeline dump to clarify the inputs
and output consumers of each stage, to make the progression structure clearer.
Fixes #32003.
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