fix(langgraph): snapshot DeltaChannel overwrite supersteps#8125
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Sydney Runkle (sydney-runkle) wants to merge 2 commits into
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fix(langgraph): snapshot DeltaChannel overwrite supersteps#8125Sydney Runkle (sydney-runkle) wants to merge 2 commits into
DeltaChannel overwrite supersteps#8125Sydney Runkle (sydney-runkle) wants to merge 2 commits into
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Sydney Runkle (sydney-runkle)
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DeltaChannel overwrite supersteps
Sydney Runkle (sydney-runkle)
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DeltaChannel overwrite superstepsDeltaChannel overwrite supersteps
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| for k in channels_to_snapshot: | ||
| new_counters[k] = (0, 0) | ||
| if do_checkpoint: | ||
| self._delta_channels_with_overwrite.difference_update(channels_to_snapshot) |
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I believe it's the same if we just clear it to empty set?
self._delta_channels_with_overwrite = set()?
Quanzheng Long (longquanzheng)
approved these changes
Jun 17, 2026
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When a DeltaChannel receives an Overwrite, force that checkpoint to store a snapshot so sparse replay starts from the post-overwrite value. This also aligns live DeltaChannel overwrite handling with BinaryOperatorAggregate by letting Overwrite bypass other reducer writes in the same superstep.