robertwb commented on a change in pull request #15271:
URL: https://github.com/apache/beam/pull/15271#discussion_r683755346
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File path: sdks/python/apache_beam/transforms/combiners.py
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@@ -616,10 +621,23 @@ def create_accumulator(self, *args, **kwargs):
return [c.create_accumulator(*args, **kwargs) for c in self._combiners]
def merge_accumulators(self, accumulators, *args, **kwargs):
- return [
- c.merge_accumulators(a, *args, **kwargs) for c,
- a in zip(self._combiners, zip(*accumulators))
- ]
+ # Make sure that `accumulators` is an iterator (so that the position is
+ # remembered).
+ accumulators = iter(accumulators)
+ result = next(accumulators)
+ while True:
+ # Load accumulators into memory and merge in batches to decrease peak
+ # memory usage.
+ accumulators_batch = list(
Review comment:
Just a thought, should the size of this list be a function of the number
of accumulators as well?
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