High Transaction Rollbacks in Langflow ( v1.1.0) in PostgresDB

[Sanath1603]

Hi,

I am experiencing a high number of continuous rollbacks in Langflow for both the starter project and my project access. I tested this on version 1.1.0 using PostgreSQL, and I noticed that out of 10 transactions, 7 to 8 are getting rolled back.

How can I resolve this issue? Any help would be greatly appreciated.

Thanks!

[dosubot[bot]]

Hey @Sanath1603! I'm here to help you with any bugs, questions, or contributions you have for Langflow. Let's work together to resolve this issue.

I found a similar unsolved discussion regarding performance issues with Langflow in production, specifically mentioning a high rollback rate in PostgreSQL. You can check out the discussion here for any updates or potential solutions that might be shared by other users or contributors ^[1].

To continue talking to Dosu, mention @dosu.

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[Sanath1603]

Hi, Thanks not able to find a solution for this issue. In the given discussion link if their is any other solution please let me know

…

On Sat, 15 Feb, 2025, 3:23 pm dosubot[bot], ***@***.***> wrote: Hey @Sanath1603 <https://github.com/Sanath1603>! I'm here to help you with any bugs, questions, or contributions you have for Langflow. Let's work together to resolve this issue. I found a similar unsolved discussion regarding performance issues with Langflow in production, specifically mentioning a high rollback rate in PostgreSQL. You can check out the discussion here <#6322> for any updates or potential solutions that might be shared by other users or contributors [1] <#6322>. *To continue talking to Dosu <https://dosu.dev>, mention @dosu <https://github.com/dosu>.* ------------------------------ Help Dosu learn! Give it feedback: Great Response <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=great_response> | Irrelevant Answer <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=irrelevant_answer> | Incorrect Sources <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=incorrect_sources> | Too Verbose <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=too_verbose> | Hallucination <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=hallucination> | Bug Report <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=bug_report> | Other <https://app.dosu.dev/response-feedback/4abcaa2d-5424-48d3-ba4f-d80d4c186de3?feedback_type=other> — Reply to this email directly, view it on GitHub <#6647 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASP5RSNXT7ODOYTYY34YGAL2P4FC3AVCNFSM6AAAAABXGGCBEGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRQHA2DMOI> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[dosubot[bot]]

Langflow triggers a transaction rollback in PostgreSQL when any exception occurs during database operations, not just IntegrityError. The transaction management code in Langflow ensures that if any error arises during a transaction, it is rolled back to maintain database integrity ^[1][2].

If you're experiencing high rollback rates, it might be helpful to investigate the specific exceptions causing these rollbacks. Unfortunately, I couldn't find specific configuration settings in Langflow to reduce rollback frequency or any retry mechanisms for failed transactions. You might want to check the logs for any error messages that could indicate why rollbacks are occurring.

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[Sanath1603]

The rollbacks are happening for starter project creation and loading . Each time when the ui is refreshed the labgflow tries to load the starter project and it's getting failed beacuse of userid and folderid mapped to the starter project how ro resolve this

…

On Sat, 15 Feb, 2025, 3:57 pm dosubot[bot], ***@***.***> wrote: Langflow triggers a transaction rollback in PostgreSQL when any exception occurs during database operations, not just IntegrityError. The transaction management code in Langflow ensures that if any error arises during a transaction, it is rolled back to maintain database integrity [1] <https://github.com/langflow-ai/langflow/blob/main/src/backend/base/langflow/services/database/models/user/crud.py> [2] <https://github.com/langflow-ai/langflow/blob/main/src/backend/base/langflow/services/database/models/transactions/crud.py> . If you're experiencing high rollback rates, it might be helpful to investigate the specific exceptions causing these rollbacks. Unfortunately, I couldn't find specific configuration settings in Langflow to reduce rollback frequency or any retry mechanisms for failed transactions. You might want to check the logs for any error messages that could indicate why rollbacks are occurring. *To continue talking to Dosu <https://dosu.dev>, mention @dosu <https://github.com/dosu>.* ------------------------------ Help Dosu learn! Give it feedback: Great Response <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=great_response> | Irrelevant Answer <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=irrelevant_answer> | Incorrect Sources <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=incorrect_sources> | Too Verbose <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=too_verbose> | Hallucination <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=hallucination> | Bug Report <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=bug_report> | Other <https://app.dosu.dev/response-feedback/748b8190-281d-4f56-b72a-641dcae6ce21?feedback_type=other> — Reply to this email directly, view it on GitHub <#6647 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASP5RSIENJBV5OK4BFUGAS32P4JC7AVCNFSM6AAAAABXGGCBEGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRQHA3DCMQ> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[dosubot[bot]]

To resolve the issue of transaction rollbacks during starter project creation and loading in Langflow due to user ID and folder ID mapping errors, ensure that the user ID and folder ID are correctly set and validated before committing the transaction. Here are some steps to address these issues:

1. Ensure User ID is Correctly Retrieved:
   Make sure the user ID is correctly retrieved from the database using the get_user_by_username function. This is crucial when loading flows from the directory.

   user_id = get_user_by_username(session, settings_service.auth_settings.SUPERUSER).id

2. Validate Folder ID:
   When creating a new project, ensure that the folder ID is valid and exists in the database. You can use a function to check if the folder exists before using its ID.

   def folder_exists(session, folder_name):
       folder = session.exec(select(Folder).where(Folder.name == folder_name)).first()
       return folder is not None

3. Create Starter Folder if Not Exists:
   Use a function to create the starter folder if it does not exist. This ensures that the folder ID used in project creation is valid.

   def create_starter_folder(session):
       if not folder_exists(session, STARTER_FOLDER_NAME):
           new_folder = FolderCreate(name=STARTER_FOLDER_NAME, description=STARTER_FOLDER_DESCRIPTION)
           db_folder = Folder.model_validate(new_folder, from_attributes=True)
           session.add(db_folder)
           session.commit()
           session.refresh(db_folder)
           return db_folder
       else:
           return session.exec(select(Folder).where(Folder.name == STARTER_FOLDER_NAME)).first()

4. Handle UUID Validation:
   Ensure that any UUIDs used for flow IDs are valid using a validation function.

   def _is_valid_uuid(val):
       try:
           uuid_obj = UUID(val)
       except ValueError:
           return False
       return str(uuid_obj) == val

By following these steps and ensuring that user IDs and folder IDs are correctly mapped and validated, you can prevent transaction rollbacks related to these mapping errors ^[1].

To continue talking to Dosu, mention @dosu.

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[Sanath1603]

Langflow ui tries to access starter project from ui home page that time rollback happens how to sto this rollback

…

On Sat, 15 Feb, 2025, 4:33 pm dosubot[bot], ***@***.***> wrote: To resolve the issue of transaction rollbacks during starter project creation and loading in Langflow due to user ID and folder ID mapping errors, ensure that the user ID and folder ID are correctly set and validated before committing the transaction. Here are some steps to address these issues: 1. *Ensure User ID is Correctly Retrieved:* Make sure the user ID is correctly retrieved from the database using the get_user_by_username function. This is crucial when loading flows from the directory. user_id = get_user_by_username(session, settings_service.auth_settings.SUPERUSER).id 2. *Validate Folder ID:* When creating a new project, ensure that the folder ID is valid and exists in the database. You can use a function to check if the folder exists before using its ID. def folder_exists(session, folder_name): folder = session.exec(select(Folder).where(Folder.name == folder_name)).first() return folder is not None 3. *Create Starter Folder if Not Exists:* Use a function to create the starter folder if it does not exist. This ensures that the folder ID used in project creation is valid. def create_starter_folder(session): if not folder_exists(session, STARTER_FOLDER_NAME): new_folder = FolderCreate(name=STARTER_FOLDER_NAME, description=STARTER_FOLDER_DESCRIPTION) db_folder = Folder.model_validate(new_folder, from_attributes=True) session.add(db_folder) session.commit() session.refresh(db_folder) return db_folder else: return session.exec(select(Folder).where(Folder.name == STARTER_FOLDER_NAME)).first() 4. *Handle UUID Validation:* Ensure that any UUIDs used for flow IDs are valid using a validation function. def _is_valid_uuid(val): try: uuid_obj = UUID(val) except ValueError: return False return str(uuid_obj) == val By following these steps and ensuring that user IDs and folder IDs are correctly mapped and validated, you can prevent transaction rollbacks related to these mapping errors [1] <https://github.com/langflow-ai/langflow/blob/dev/src/backend/base/langflow/initial_setup/setup.py> . *To continue talking to Dosu <https://dosu.dev>, mention @dosu <https://github.com/dosu>.* ------------------------------ Help Dosu learn! Give it feedback: Great Response <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=great_response> | Irrelevant Answer <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=irrelevant_answer> | Incorrect Sources <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=incorrect_sources> | Too Verbose <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=too_verbose> | Hallucination <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=hallucination> | Bug Report <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=bug_report> | Other <https://app.dosu.dev/response-feedback/22b8a85c-9774-48b5-bf1c-cafed62b6fe9?feedback_type=other> — Reply to this email directly, view it on GitHub <#6647 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASP5RSO72DTZ3AU7G37KWET2P4NHPAVCNFSM6AAAAABXGGCBEGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRQHA3TMMA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[dosubot[bot]]

To stop the rollbacks when Langflow tries to access the starter project from the UI home page, ensure that the user ID and folder ID are correctly retrieved and validated. Here are some steps to help resolve this issue:

1. Ensure User ID Retrieval: Verify that the user ID is correctly retrieved using the get_user_by_username function. This is crucial for associating flows with the correct user.

2. Validate Folder ID: Check that the folder ID exists in the database before using it. Implement a function to verify the existence of the folder.

3. Create Starter Folder if Necessary: Use a function to create the starter folder if it does not exist. This ensures that the folder ID used in project creation is valid.

4. Check UUID Validity: Ensure that any UUIDs used for flow IDs are valid by using a validation function.

By following these steps, you can prevent transaction rollbacks related to user ID and folder ID mapping errors during the starter project loading process ^[1][2].

To continue talking to Dosu, mention @dosu.

---

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[Sanath1603]

added screenshot for refrence still not able to find where the transaction are rolledback . The folder id and user id are in database and verified this

[Sanath1603]

Refer rhe screen shot when am trying to access the flow or folders from home page rolbacks are happening and all the queries are correct. And how I can stop rollback for selectquery don't want transaction to be rolled back how to achieve this

…

On Sat, 15 Feb, 2025, 6:31 pm dosubot[bot], ***@***.***> wrote: To stop the rollbacks when Langflow tries to access the starter project from the UI home page, ensure that the user ID and folder ID are correctly retrieved and validated. Here are some steps to help resolve this issue: 1. *Ensure User ID Retrieval*: Verify that the user ID is correctly retrieved using the get_user_by_username function. This is crucial for associating flows with the correct user. 2. *Validate Folder ID*: Check that the folder ID exists in the database before using it. Implement a function to verify the existence of the folder. 3. *Create Starter Folder if Necessary*: Use a function to create the starter folder if it does not exist. This ensures that the folder ID used in project creation is valid. 4. *Check UUID Validity*: Ensure that any UUIDs used for flow IDs are valid by using a validation function. By following these steps, you can prevent transaction rollbacks related to user ID and folder ID mapping errors during the starter project loading process [1] <https://github.com/langflow-ai/langflow/blob/main/src/backend/base/langflow/initial_setup/setup.py> [2] <https://github.com/logspace-ai/langflow/blob/dev/src/backend/base/langflow/initial_setup/setup.py> . *To continue talking to Dosu <https://dosu.dev>, mention @dosu <https://github.com/dosu>.* ------------------------------ Help Dosu learn! Give it feedback: Great Response <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=great_response> | Irrelevant Answer <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=irrelevant_answer> | Incorrect Sources <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=incorrect_sources> | Too Verbose <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=too_verbose> | Hallucination <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=hallucination> | Bug Report <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=bug_report> | Other <https://app.dosu.dev/response-feedback/77746b84-de3c-4319-9724-efc2a325cd4a?feedback_type=other> — Reply to this email directly, view it on GitHub <#6647 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASP5RSL3VVHYLSOBMSTUXET2P43CDAVCNFSM6AAAAABXGGCBEGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRQHEZTKOA> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[dosubot[bot]]

To prevent transaction rollbacks for select queries in Langflow, ensure that the database operations are executed in a read-only mode. Langflow uses DuckDB connections with the read_only parameter set to True for read-only operations, which helps avoid unnecessary transaction rollbacks. Here's how you can implement this:

1. Use Read-Only Connections: When executing select queries, make sure the database connection is opened in read-only mode. This can be done by setting read_only=True in the connection setup.

   with duckdb.connect(str(self.db_path), read_only=True) as conn:
       df = conn.execute(query).df()

2. Check for Exceptions: Ensure that any exceptions during the execution of select queries are properly handled. This can prevent rollbacks triggered by unexpected errors.

3. Review Error Handling: If using SQLAlchemy or similar ORM, review the error handling logic to ensure that select queries do not trigger rollbacks. This might involve checking the session management and ensuring that exceptions are caught and handled appropriately.

By following these steps, you can minimize transaction rollbacks during select queries in Langflow ^[1].

To continue talking to Dosu, mention @dosu.

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[Sanath1603]

How implement this for postgres db which is used for storing all the tables and data in backecode of langflow. Read only mode

…

On Mon, 17 Feb, 2025, 9:33 am dosubot[bot], ***@***.***> wrote: To prevent transaction rollbacks for select queries in Langflow, ensure that the database operations are executed in a read-only mode. Langflow uses DuckDB connections with the read_only parameter set to True for read-only operations, which helps avoid unnecessary transaction rollbacks. Here's how you can implement this: 1. *Use Read-Only Connections*: When executing select queries, make sure the database connection is opened in read-only mode. This can be done by setting read_only=True in the connection setup. with duckdb.connect(str(self.db_path), read_only=True) as conn: df = conn.execute(query).df() 2. *Check for Exceptions*: Ensure that any exceptions during the execution of select queries are properly handled. This can prevent rollbacks triggered by unexpected errors. 3. *Review Error Handling*: If using SQLAlchemy or similar ORM, review the error handling logic to ensure that select queries do not trigger rollbacks. This might involve checking the session management and ensuring that exceptions are caught and handled appropriately. By following these steps, you can minimize transaction rollbacks during select queries in Langflow [1] <https://github.com/langflow-ai/langflow/blob/dev/src/backend/base/langflow/services/monitor/service.py> . *To continue talking to Dosu <https://dosu.dev>, mention @dosu <https://github.com/dosu>.* ------------------------------ Help Dosu learn! Give it feedback: Great Response <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=great_response> | Irrelevant Answer <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=irrelevant_answer> | Incorrect Sources <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=incorrect_sources> | Too Verbose <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=too_verbose> | Hallucination <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=hallucination> | Bug Report <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=bug_report> | Other <https://app.dosu.dev/response-feedback/ba6f5ec3-3981-44b3-b375-6e935418dc8f?feedback_type=other> — Reply to this email directly, view it on GitHub <#6647 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ASP5RSIJ2T5ZNXV5HN7MCU32QFNSZAVCNFSM6AAAAABXGGCBEGVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTEMRRHE3DQNI> . You are receiving this because you were mentioned.Message ID: ***@***.***>

[dosubot[bot]]

To implement read-only mode for PostgreSQL in Langflow, you can follow these steps:

1. Use Read-Only Connections: Establish a connection to PostgreSQL with read-only settings. This can be done by setting the appropriate connection parameters in your database connection string, such as options='-c default_transaction_read_only=on'.

   Example:

   import psycopg2
   conn = psycopg2.connect(
       dbname='your_db',
       user='your_user',
       password='your_password',
       host='your_host',
       options='-c default_transaction_read_only=on'
   )

2. Execute Queries: Use this connection to execute your SELECT queries. Ensure that your queries are structured to avoid any unintended write operations.

3. Error Handling: Implement robust error handling to catch exceptions during query execution, preventing transaction rollbacks. This is crucial for maintaining stability in read-only operations.

4. Review ORM Settings: If using an ORM like SQLAlchemy, ensure that the session is configured for read-only operations and that exceptions are managed to avoid rollbacks.

By following these steps, you can effectively manage read-only access to your PostgreSQL database in the Langflow backend.

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