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[PR #27602] Fix: prevent workflow early termination when Answer node completes before parallel nodes in IF/ELSE branch #31816

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opened 2026-02-21 20:50:11 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:50:11 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/27602

State: open
Merged: No

Important

  1. Make sure you have read our contribution guidelines
  2. Ensure there is an associated issue and you have been assigned to it
  3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

Details

  • Add has_pending_sessions() method to ResponseStreamCoordinator to check for active/waiting/pending response sessions
  • Update GraphStateManager.is_execution_complete() to consider pending response sessions
  • Pass response_coordinator to GraphStateManager in GraphEngine
  • Add comprehensive unit tests for the fix

This fixes an issue where workflows would terminate prematurely when:

  1. IF/ELSE node has parallel branches
  2. One branch contains an Answer node alongside other nodes (e.g., LLM)
  3. Answer node completes before the parallel nodes

The workflow now correctly waits for all parallel nodes to complete before terminating.

Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/27602 **State:** open **Merged:** No --- > [!IMPORTANT] > > 1. Make sure you have read our [contribution guidelines](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) > 1. Ensure there is an associated issue and you have been assigned to it > 1. Use the correct syntax to link this PR: `Fixes #<issue number>`. ## Summary <!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. --> ## Details - Add has_pending_sessions() method to ResponseStreamCoordinator to check for active/waiting/pending response sessions - Update GraphStateManager.is_execution_complete() to consider pending response sessions - Pass response_coordinator to GraphStateManager in GraphEngine - Add comprehensive unit tests for the fix This fixes an issue where workflows would terminate prematurely when: 1. IF/ELSE node has parallel branches 2. One branch contains an Answer node alongside other nodes (e.g., LLM) 3. Answer node completes before the parallel nodes The workflow now correctly waits for all parallel nodes to complete before terminating. ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [x] I've updated the documentation accordingly. - [x] I ran `dev/reformat`(backend) and `cd web && npx lint-staged`(frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:50:11 -05:00
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Reference: langgenius/dify#31816
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