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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"PubSub topic.create method should raise a Conflict error instead of RetryError/GaxError when topic exists","articleBody":"Following the [documentation from PubSub site](https://cloud.google.com/pubsub/docs/reference/libraries#client-libraries-install-python) if you run the example 2x it will generate the error:\r\n```\r\nGaxError(Exception occurred in retry method that was not classified as transient, caused by \u003c_Rendezvous of RPC that terminated with (StatusCode.ALREADY_EXISTS, Resource already exists in the project (resource=my-new-topic).)\u003e) \u003cclass 'google.gax.errors.RetryError'\u003e\r\n```\r\n\r\nHowever it should raise Conflict Error (google.cloud.exceptions.Conflict), because the API returns a 409 response.\r\nYou can see the status code using API Explorer:\r\nhttps://developers.google.com/apis-explorer/#search/pubsub/pubsub/v1/pubsub.projects.topics.create\r\n```\r\n409  \r\n{\r\n \"error\": {\r\n  \"code\": 409,\r\n  \"message\": \"Resource already exists in the project (resource=my-new-topic).\",\r\n  \"status\": \"ALREADY_EXISTS\",\r\n...\r\n  }\r\n}\r\n```\r\nFull traceback on Python:\r\n```\r\n\u003e\u003e\u003e topic.create()\r\nTraceback (most recent call last):\r\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/cloud/pubsub/topic.py\", line 155, in create\r\n    api.topic_create(topic_path=self.full_name)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/cloud/pubsub/_gax.py\", line 104, in topic_create\r\n    topic_pb = self._gax_api.create_topic(topic_path)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/cloud/gapic/pubsub/v1/publisher_client.py\", line 278, in create_topic\r\n    return self._create_topic(request, options)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/gax/api_callable.py\", line 419, in inner\r\n    return api_caller(api_call, this_settings, request)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/gax/api_callable.py\", line 407, in base_caller\r\n    return api_call(*args)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/gax/api_callable.py\", line 368, in inner\r\n    return a_func(*args, **kwargs)\r\n  File \"/usr/local/google/home/lucmult/.virtualenvs/pubsub/local/lib/python2.7/site-packages/google/gax/retry.py\", line 126, in inner\r\n    ' classified as transient', exception)\r\ngoogle.gax.errors.RetryError: GaxError(Exception occurred in retry method that was not classified as transient, caused by \u003c_Rendezvous of RPC that terminated with (StatusCode.ALREADY_EXISTS, Resource already exists in the project (resource=my-new-topic).)\u003e)\r\n```\r\n \r\n","author":{"url":"https://github.com/lucmult","@type":"Person","name":"lucmult"},"datePublished":"2017-03-21T00:10:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":8},"url":"https://github.com/3175/google-cloud-python/issues/3175"}