Exception("parent run not found")

[emailic]

For some reason, we are constantly getting logs of "Parent run not found". Just today, we got it 23 times. I checked out this thread but not 100% sure if this is applicable in our case as we are not really running .invoke on a chain I'm not mistaken.

from typing import Any, Dict, Optional

from langfuse.callback.langchain import LangchainCallbackHandler  # type: ignore

from common.domain.model_config import ModelConfig


class LangfuseCallbackHandler(LangchainCallbackHandler):  # type: ignore
    def __init__(self, model_config: ModelConfig, *args: Any, **kwargs: Any) -> None:
        super().__init__(*args, **kwargs)
        self.model_config = model_config
    def _parse_model_and_log_errors(
        self, serialized: Dict[str, Any], kwargs: Any
    ) -> Optional[str]:
        try:
            # Instead of parsing, directly return the model name from model_config
            model_name = self.model_config.model_name
            if model_name:
                return model_name

            self.log.warning(
                "Langfuse was not able to parse the LLM model. The LLM call will be recorded without model name. Please create an issue so we can fix your integration: https://github.com/langfuse/langfuse/issues/new/choose"
            )
            self._report_error(
                {
                    "log": "unable to parse model name",
                    "kwargs": str(kwargs),
                    "serialized": str(serialized),
                }
            )
        except Exception as e:
            self.log.exception(e)
            self.log.warning(
                "Langfuse was not able to parse the LLM model. The LLM call will be recorded without model name. Please create an issue so we can fix your integration: https://github.com/langfuse/langfuse/issues/new/choose"
            )
            self._report_error(
                {
                    "log": "unable to parse model name",
                    "kwargs": str(kwargs),
                    "serialized": str(serialized),
                    "exception": str(e),
                }
            )

        return None

The traceback:

{
  "textPayload": "parent run not found\nTraceback (most recent call last):\n  File \"/layers/google.python.pip/pip/lib/python3.11/site-packages/langfuse/callback/langchain.py\", line 433, in on_tool_start\n    raise Exception(\"parent run not found\")\nException: parent run not found",
  "insertId": "66445570000602d52c839e09",
  "httpRequest": {
    "requestMethod": "POST",
    "requestUrl": "http://chat-wwfctuvufa-ez.a.run.app/",
    "userAgent": "APIs-Google; (+https://developers.google.com/webmasters/APIs-Google.html)",
    "protocol": "HTTP/1.1"
  },
  "resource": {
    "type": "cloud_run_revision",
    "labels": {
      "configuration_name": "chat",
      "project_id": "noa-dev-dbb6",
      "location": "europe-west4",
      "revision_name": "chat-00615-tah",
      "service_name": "chat"
    }
  },
  "timestamp": "2024-05-15T06:25:52.393941Z",
  "severity": "ERROR",
  "labels": {
    "python_logger": "langfuse",
    "instanceId": "00f46b92853f2ce0f73967a40ead33fe6a4fa43ce4ad57e6c3f59593d33331ea3e6af11fc7d1050504b043a15a2fc10f8a4dbb337c5ff2d4c601715c08f12dfd55",
    "goog-managed-by": "cloudfunctions"
  },
  "logName": "projects/noa-dev-dbb6/logs/run.googleapis.com%2Fstdout",
  "trace": "projects/noa-dev-dbb6/traces/c274de2af18f142fcf0a24088e05acb0",
  "sourceLocation": {
    "file": "/layers/google.python.pip/pip/lib/python3.11/site-packages/langfuse/callback/langchain.py",
    "line": "449",
    "function": "on_tool_start"
  },
  "receiveTimestamp": "2024-05-15T06:25:52.595559344Z",
  "spanId": "43febdddb047101f",
  "traceSampled": true,
  "errorGroups": [
    {
      "id": "CK-UquzXxvDtYg"
    }
  ]
}

Let me know if you need any additional information!

[marcklingen]

thanks for reporting this. can you share some code to reproduce this problem and create an issue for this?

[emailic]

Hi! Sure, as soon as we prioritize this matter again at my workplace I will submit the code for reproducing the problem. How come this discussion was closed and marked as a duplicate? :)

Thanks Marc,

[marcklingen]

Sorry, meant to merge this with the ongoing issue tracking this issue here: #1927