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POgetaddrinfo() seems to block when using eventlet
 

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  1. POgetaddrinfo() seems to block when using eventlet
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    <p>I run my Django-celery tasks using eventlet. But something is still blocking. I used eventlet's blocking detection and found out that getaddrinfo() is blocking. I read somewhere that I have to install the "dnspython" package, but it makes no difference with or without. It is installed at the moment:</p> <pre><code>dnspython - A DNS toolkit for Python INSTALLED: 1.11.0 (latest) </code></pre> <p>It is also funny that the blocking appears somewhere inside eventlet's code (eventlet.green.socket).</p> <p>I run celery like that:</p> <pre><code>/var/www/myproject/async_manage.py celeryd -B \ --schedule=/var/www/myproject/celerybeat-schedule \ --loglevel=INFO -P eventlet -c 1000 \ --settings=myproject.settings.myproject_deployment </code></pre> <p>My custom async_manage.py (parts of it):</p> <pre><code>import pymysql pymysql.install_as_MySQLdb() import eventlet import eventlet.debug os.environ["EVENTLET_NOPATCH"] = 'True' eventlet.monkey_patch() eventlet.debug.hub_prevent_multiple_readers(False) eventlet.debug.hub_blocking_detection(True, 0.1) if __name__ == "__main__": from django.core.management import execute_from_command_line execute_from_command_line(sys.argv) </code></pre> <p>This is the error I get:</p> <pre><code>Task myproject.apps.myapp.tasks.mytask with id f8794028-699e-43ba-b48f-3d81b7614f1f raised exception: 'RuntimeError("Blocking detector ALARMED atTraceback(filename=\'/var/www/virtualenvs/myproject/local/lib/python2.7/site-packages/eventlet/green/socket.py\', lineno=43, function=\'create_connection\', code_context=[\' for res in getaddrinfo(host, port, 0, SOCK_STREAM):\\\\n\'], index=0)",)' </code></pre> <p>Do you have any clue how to fix that? This makes no sense to me.</p> <p>Thanks in advance, Matthias</p>
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    1. USMatthias Scholz
    1. USMatthias Scholz
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