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No streaming output occurs after the question classifier. #12120

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opened 2026-02-21 19:05:53 -05:00 by yindo · 1 comment
yindo commented 2026-02-21 19:05:53 -05:00
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Originally created by @congziqi on GitHub (Mar 25, 2025).

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  • This is only for bug report, if you would like to ask a question, please head to Discussions.
  • I have searched for existing issues search for existing issues, including closed ones.
  • I confirm that I am using English to submit this report (我已阅读并同意 Language Policy).
  • [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:)
  • Please do not modify this template :) and fill in all the required fields.

Dify version

1.1.0

Cloud or Self Hosted

Self Hosted (Source)

Steps to reproduce

A conditional branch, branch 1, branch 2.
Branch 1 goes through a question classifier, and both branch 2 and branch 1 go through LLM node 2.
This will ultimately result in branch 1 not performing streaming output after LLM node 2.

Image

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

Originally created by @congziqi on GitHub (Mar 25, 2025). ### Self Checks - [x] This is only for bug report, if you would like to ask a question, please head to [Discussions](https://github.com/langgenius/dify/discussions/categories/general). - [x] I have searched for existing issues [search for existing issues](https://github.com/langgenius/dify/issues), including closed ones. - [x] I confirm that I am using English to submit this report (我已阅读并同意 [Language Policy](https://github.com/langgenius/dify/issues/1542)). - [x] [FOR CHINESE USERS] 请务必使用英文提交 Issue，否则会被关闭。谢谢！:) - [x] Please do not modify this template :) and fill in all the required fields. ### Dify version 1.1.0 ### Cloud or Self Hosted Self Hosted (Source) ### Steps to reproduce A conditional branch, branch 1, branch 2. Branch 1 goes through a question classifier, and both branch 2 and branch 1 go through LLM node 2. This will ultimately result in branch 1 not performing streaming output after LLM node 2. ![Image](https://github.com/user-attachments/assets/946e0d63-b7aa-41c6-ab6a-10cdb7322165) ### ✔️ Expected Behavior _No response_ ### ❌ Actual Behavior _No response_
yindo added the 🌊 feat:workflow label 2026-02-21 19:05:53 -05:00
yindo closed this issue 2026-02-21 19:05:53 -05:00
yindo commented 2026-02-21 19:05:53 -05:00
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@dosubot[bot] commented on GitHub (Mar 25, 2025):

I found a similar open issue related to non-streaming output in Dify workflows. The issue suggests that the problem might be related to the configuration of conditional branching logic. Specifically, if the 'else' branch is not properly configured with a path, it can cause a blockage in streaming output [1].

To ensure proper streaming output, you might want to consider structuring your branches as follows:

  1. Create two separate parallel branches:
    • First branch: Execute 'code1' followed by 'IF-ELSE-1'
    • Second branch: Execute 'code2' followed by 'IF-ELSE-2'
  2. Have both branches converge at a variable aggregator.
  3. Connect the variable aggregator to the LLM block.

This setup allows each branch to independently produce stream responses, preventing the ELSE branch from blocking execution until all nodes are completed [2].

To continue talking to Dosu, mention @dosu.

Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other

@dosubot[bot] commented on GitHub (Mar 25, 2025): <!-- Answer --> I found a similar open issue related to non-streaming output in Dify workflows. The issue suggests that the problem might be related to the configuration of conditional branching logic. Specifically, if the 'else' branch is not properly configured with a path, it can cause a blockage in streaming output <sup>[[1]](https://github.com/langgenius/dify/issues/14222)</sup>. To ensure proper streaming output, you might want to consider structuring your branches as follows: 1. Create two separate parallel branches: - First branch: Execute 'code1' followed by 'IF-ELSE-1' - Second branch: Execute 'code2' followed by 'IF-ELSE-2' 2. Have both branches converge at a variable aggregator. 3. Connect the variable aggregator to the LLM block. This setup allows each branch to independently produce stream responses, preventing the ELSE branch from blocking execution until all nodes are completed <sup>[[2]](https://github.com/langgenius/dify/issues/15162)</sup>. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=hallucination) | [Bug Report](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=bug_report) | [Other](https://app.dosu.dev/response-feedback/2ef6c8ed-4523-4630-a41d-2f3a3edefa5c?feedback_type=other)</sup>
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Reference: langgenius/dify#12120
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