Resolve conversation

opentelemetry-api/src/opentelemetry/context/__init__.py

@@ -51,8 +51,19 @@ def _load_runtime_context() -> typing.Optional[_RuntimeContext]:
             )
         ).load()()
     except Exception:  # pylint: disable=broad-except
-        logger.exception("Failed to load context: %s", configured_context)
-        return None
+        logger.exception(
+            "Failed to load context: %s, fallback to %s",
+            configured_context,
+            OTEL_PYTHON_CONTEXT,
+        )
+        return next(  # type: ignore
+            iter(  # type: ignore
+                entry_points(  # type: ignore
+                    group="opentelemetry_context",
+                    name=OTEL_PYTHON_CONTEXT,
+                )
+            )
+        ).load()()
 
 
 _RUNTIME_CONTEXT = _load_runtime_context()

opentelemetry-api/tests/context/test_context.py

@@ -13,7 +13,7 @@
 # limitations under the License.
 
 import unittest
-from os import environ
+from unittest.mock import patch
 
 from opentelemetry import context
 from opentelemetry.context.context import Context
@@ -80,11 +80,11 @@ def test_set_current(self):
 
 
 class TestInitContext(unittest.TestCase):
-    def test_load_runtime_context(self):
-        environ[OTEL_PYTHON_CONTEXT] = "contextvars_context"
+    def test_load_runtime_context_default(self):
         ctx = context._load_runtime_context()  # pylint: disable=W0212
         self.assertIsInstance(ctx, ContextVarsRuntimeContext)
 
-        environ.pop(OTEL_PYTHON_CONTEXT)
+    @patch.dict("os.environ", {OTEL_PYTHON_CONTEXT: "contextvars_context"})
+    def test_load_runtime_context(self):
         ctx = context._load_runtime_context()  # pylint: disable=W0212
         self.assertIsInstance(ctx, ContextVarsRuntimeContext)