René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Bigtable system test has a \"race condition\" if run simultaneously on same project","articleBody":"Two builds ([1682][1] and [1683][2]) were happening simultaneously and this caused a [Bigtable system test check][3] to fail in the second build (1683)\r\n\r\n```python \r\n\u003e       self.assertEqual(len(instances), len(EXISTING_INSTANCES) + 1)\r\nE       AssertionError: 2 != 3\r\n```\r\n\r\nThis is because `EXISTING_INSTANCES` is set at module setup time while the test case is run later.\r\n\r\nI'm not sure what a realistic fix should be?\r\n\r\n[1]: https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/1682\r\n[2]: https://circleci.com/gh/GoogleCloudPlatform/google-cloud-python/1683\r\n[3]: https://github.com/GoogleCloudPlatform/google-cloud-python/blob/ce043bba2883588a89b5c4c9ad34c2af64287d5e/bigtable/tests/system.py#L145","author":{"url":"https://github.com/dhermes","@type":"Person","name":"dhermes"},"datePublished":"2017-04-27T17:46:38.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/3333/google-cloud-python/issues/3333"}