Troubleshooting services

Crash diagnostics

Services save the following data to the cloud if they crash while processing a question:

  • Input values

  • Input manifest and datasets

  • Child configuration values

  • Child configuration manifest and datasets

  • Inputs to and messages received in answer to each question the service asked its children (if it has any). These are stored in the order the questions were asked.


For this feature to be enabled, the child must have the crash_diagnostics_cloud_path field in its service configuration (octue.yaml file) set to a Google Cloud Storage path.

Accessing crash diagnostics

In the event of a crash, the service will upload the crash diagnostics and send the upload path to the parent as a log message. A user with credentials to access this path can use the octue CLI to retrieve the crash diagnostics data:

octue get-crash-diagnostics <cloud-path>

More information on the command:

>>> octue get-crash-diagnostics -h

Usage: octue get-crash-diagnostics [OPTIONS] CLOUD_PATH

  Download crash diagnostics for an analysis from the given directory in
  Google Cloud Storage. The cloud path should end in the analysis ID.

  CLOUD_PATH: The path to the directory in Google Cloud Storage containing the
  diagnostics data.

  --local-path DIRECTORY  The path to a directory to store the directory of
                          diagnostics data in. Defaults to the current working
  --download-datasets     If provided, download any datasets from the crash
                          diagnostics and update their paths in their
                          manifests to the new local paths.
  -h, --help              Show this message and exit.

Creating test fixtures from crash diagnostics

You can create test fixtures directly from crash diagnostics, allowing you to recreate the exact conditions that caused your service to fail.

from unittest.mock import patch

from octue import Runner
from octue.utils.testing import load_test_fixture_from_crash_diagnostics

 ) = load_test_fixture_from_crash_diagnostics(path="path/to/downloaded/crash/diagnostics")

# You can explicitly specify your children here as shown or
# read the same information in from your app configuration file.
children = [
        "key": "my_child",
        "id": "octue/my-child-service:latest",
        "backend": {
            "name": "GCPPubSubBackend",
            "project_name": "my-project",
        "key": "another_child",
        "id": "octue/another-child-service:latest",
        "backend": {
            "name": "GCPPubSubBackend",
            "project_name": "my-project",

runner = Runner(
    twine=os.path.join(app_directory_path, "twine.json"),

with patch("octue.runner.Child", side_effect=child_emulators):
    analysis =, input_manifest=input_manifest)

Disabling crash diagnostics

When asking a question to a child, parents can disable crash diagnostics upload in the child on a question-by-question basis by setting allow_save_diagnostics_data_on_crash to False in Child.ask. For example:

child = Child(
    backend={"name": "GCPPubSubBackend", "project_name": "my-project"},

answer = child.ask(
    input_values={"height": 32, "width": 3},