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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Calling `subscription.pull(return_immediately=True)` hangs","articleBody":"I've got a fairly simple PubSub setup. The subscriber tries to pull from a topic with `return_immediately` set to `True`, and performs some actions based on the data that was returned. If there was no data, the consumer waits up to 5 seconds and tries again. In pseudocode:\n\n``` python\nclient = pubsub.get_client()\ntopic = client.get_topic()\nsubscription = topic.get_subscription()\nwhile True:\n    data = subscription.pull(return_immediately=True)\n    if data:\n        do_work(data)\n    else:\n        sleep(5)\n```\n\nI've noticed that after running this for a while, my subscriber just hangs on the `subscription.pull(return_immediately=True)` call. I would expect that, if a network error occurs, the connection would time out and that the function call would result in an exception.\n\nI've tried debugging this by setting the log level of the `oauth2client` and `oauth2client.client` loggers to `logging.DEBUG`, but this didn't help me. I've also looked at the `gcloud.connection` file, but didn't find where the error might occur.\n\nIf I'm doing anything wrong, or can help solve this problem in another way, then don't hesitate to ask!\n","author":{"url":"https://github.com/GilJ","@type":"Person","name":"GilJ"},"datePublished":"2016-02-08T16:36:08.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/1441/google-cloud-python/issues/1441"}