langchain-ai/langgraph
1
0
Fork 0
mirror of https://github.com/langchain-ai/langgraph.git synced 2026-07-15 12:35:43 -04:00
Code Issues 314 Packages Projects Releases 17 Wiki Activity

[PR #4988] Fix fork checkpoint #4188

New Issue
Closed
opened 2026-02-20 17:49:48 -05:00 by yindo · 0 comments
yindo commented 2026-02-20 17:49:48 -05:00
Owner
Copy Link
Copy Source

Original Pull Request: https://github.com/langchain-ai/langgraph/pull/4988

State: closed
Merged: No

What this PR does

  • Updated all code paths that create a new checkpoint during a fork or replay to use is_fork=True when calling create_checkpoint.
  • This ensures that a new, unique checkpoint ID is generated for each new step after a fork, preserving the integrity of the checkpoint history.

Example of the fix:

# Before (buggy)
next_checkpoint = create_checkpoint(checkpoint, None, step)
checkpoint = create_checkpoint(checkpoint, channels, step + 1)

# After (fixed)
next_checkpoint = create_checkpoint(checkpoint, None, step, is_fork=True)
checkpoint = create_checkpoint(checkpoint, channels, step + 1, is_fork=True)

Fixes #4987

**Original Pull Request:** https://github.com/langchain-ai/langgraph/pull/4988 **State:** closed **Merged:** No --- # What this PR does - Updated all code paths that create a new checkpoint during a fork or replay to use `is_fork=True` when calling `create_checkpoint`. - This ensures that a new, unique checkpoint ID is generated for each new step after a fork, preserving the integrity of the checkpoint history. **Example of the fix:** ```python # Before (buggy) next_checkpoint = create_checkpoint(checkpoint, None, step) checkpoint = create_checkpoint(checkpoint, channels, step + 1) # After (fixed) next_checkpoint = create_checkpoint(checkpoint, None, step, is_fork=True) checkpoint = create_checkpoint(checkpoint, channels, step + 1, is_fork=True) ``` Fixes #4987
yindo added the pull-request label 2026-02-20 17:49:48 -05:00
yindo closed this issue 2026-02-20 17:49:48 -05:00
Sign in to join this conversation.
No Branch/Tag Specified
Branches Tags
Labels
Clear labels
agents
awaiting author revision
bug
change
chat models
checkpointer
ci
code quality
code quality
dependencies
documentation
drawing
duplicate
enhancement
good first issue
help wanted
invalid
maintainer
meta
missing information
not maintained by langchain
open-swe-auto
open-swe-max
open-swe-max-auto
pending
performance
pull-request
Mirrored from GitHub Pull Request
 question
requires design
sdk
server
stale
studio
tests
type checking
usage question
v0.5
v1.1
No Label pull-request
Milestone
No items
No Milestone
Projects
Clear projects
No project
Assignees
Clear assignees
yindo
No Assignees
1 Participants
Notifications
Due Date
No due date set.
Dependencies

No dependencies set.

Reference: langchain-ai/langgraph#4188
Delete Branch "%!s()"

Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?