Bryan Yang created AIRFLOW-4265:
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Summary: Lineage backend did not work normally
Key: AIRFLOW-4265
URL: https://issues.apache.org/jira/browse/AIRFLOW-4265
Project: Apache Airflow
Issue Type: Bug
Reporter: Bryan Yang
Assignee: Bryan Yang
1. Lineage backend comes from {{import_string}} function, and {{import_string}}
will try to seperate module_path and class_name by dot.
{quote}def import_string(dotted_path):
"""
Import a dotted module path and return the attribute/class designated by the
last name in the path. Raise ImportError if the import failed.
"""
try:
module_path, class_name = dotted_path.rsplit('.', 1)
except ValueError:
raise ImportError("{} doesn't look like a module path".format(dotted_path))
module = import_module(module_path)
{quote}
But in the current document: {{backend = airflow.lineage.backend.atlas}} which
is just a module path without class name \{{AtlasBackend}}.
2. Continuously, this function will return a module or class instead of an
instance. So that when {{apply_lineage}} want to call {{backend.send_lineage}},
it will fail.
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