langgraph

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Sydney RunkleandClaude Sonnet 4.6 72343bdfb9 fix(pregel): flush pending write futures before put when checkpoint has DELTA_SENTINEL

In async (default) durability mode, put_writes is fire-and-forget. If
checkpoint_writes fails but put succeeds, the sentinel blob has no
backing writes — reads silently reconstruct empty/wrong state.

Fix: track futures returned by put_writes submissions in
_pending_write_futs. Before committing a checkpoint that contains any
DELTA_SENTINEL blob, call .result() on all pending write futures,
blocking until they complete. This ensures checkpoint_writes are durable
before the sentinel blob is committed.

The flush only triggers when DELTA_SENTINEL is present, so graphs
without DeltaChannel channels are unaffected. Snapshot steps
(_DeltaSnapshot blobs) are self-contained and do not need the flush.

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

2026-04-28 16:04:31 -04:00

checkpoint

fix(checkpoint): prune preserves checkpoint_writes needed for DeltaChannel reconstruction

2026-04-28 15:52:36 -04:00

checkpoint-conformance

chore(deps): bump langsmith from 0.7.3 to 0.7.31 in /libs/checkpoint-conformance (#7523 )

2026-04-15 19:36:27 -07:00

checkpoint-postgres

fix: format import order in checkpoint and checkpoint-postgres

2026-04-27 20:46:16 -04:00

checkpoint-sqlite

chore(deps): bump langsmith from 0.6.4 to 0.7.31 in /libs/checkpoint-sqlite (#7524 )