[ros2component] find_container_node_names sometimes fails in the presence of other nodes #321
Description
The ros2component API tests call find_container_node_names, which sometimes fails in the presence of other running tests:
________________________ test_find_container_node_names ________________________
test/test_api.py:30: in test_find_container_node_names
assert len(find_container_node_names(
ros2component/api/__init__.py:204: in find_container_node_names
services = get_service_info(node=node, remote_node_name=n.full_name)
../../../../install/ros2node/lib/python3.6/site-packages/ros2node/api/__init__.py:76: in get_service_info
return get_topics(remote_node_name, node.get_service_names_and_types_by_node)
../../../../install/ros2node/lib/python3.6/site-packages/ros2node/api/__init__.py:59: in get_topics
names_and_types = func(node.name, node.namespace)
../../../../install/rclpy/lib/python3.6/site-packages/rclpy/node.py:1505: in get_service_names_and_types_by_node
capsule, node_name, node_namespace)
E RuntimeError: Failed to get_service_names_and_types: Unable to find GUID for node , at /home/jenkins-agent/workspace/nightly_linux_release/ws/src/ros2/rmw_fastrtps/rmw_fastrtps_shared_cpp/src/rmw_node_info_and_types.cpp:87
On the CI farm, it seems to be common that this test runs at the same time as the pendulum_control tests, and it causes this test to fail. I was able to reproduce the behavior locally by running both tests in simultaneously in a loop.