kennknowles commented on a change in pull request #14060:
URL: https://github.com/apache/beam/pull/14060#discussion_r581658489
##########
File path: sdks/python/apache_beam/transforms/trigger.py
##########
@@ -369,6 +370,48 @@ def has_ontime_pane(self):
return False
+class AfterSynchronizedProcessingTime(TriggerFn):
+ """Fire exactly once after all worker clocks catch up the first element that
arrives
+
+ AfterSynchronizedProcessingTime is experimental. No backwards compatibility
guarantees.
+ """
+ def __repr__(self):
+ return 'AfterSynchronizedProcessingTime()'
+
+ def on_element(self, element, window, context):
+ # TODO: sort out whether this should be a NOOP or how to get the clock to
be
+ # passed in
+ #context.set_timer(
+ # '', TimeDomain.DEPENDENT_REAL_TIME, context.get_current_time())
Review comment:
The `clock` is `None` in the context. Not sure where in the fn api
runner that gets set. Not sure if I should just make this a noop or behave like
Always trigger anyhow. But for my first draft I just went with what it should
actually do, and that is crashy.
##########
File path: sdks/python/apache_beam/transforms/core.py
##########
@@ -2364,6 +2364,22 @@ def from_runner_api_parameter(
def runner_api_requires_keyed_input(self):
return True
+ def get_windowing(self, inputs):
Review comment:
Do I understand right that the idea is for it all to be lazily
propagated?
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