11 December 2011

Appengine backends and task queues

To get appengine to send queued tasks to a backend, you need to set the host header when queuing the task. E.g.
    deferred.defer(
        batch.DoStuff, arg1, arg2, arg3,
        _headers={'Host': backends.get_hostname(backend='backend_name')})
at

5 comments:

  1. Unknown12 December, 2011 16:00

    To a backend *in particular*, you mean? Good to know, thanks!

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  2. Jim12 December, 2011 16:02

    Actually, it's to a backend type. Not a particular backend instance. For task queues, you shouldn't care about backend instances.

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  3. Anonymous23 December, 2011 08:52

    you can also use target. http://code.google.com/appengine/docs/python/taskqueue/overview-push.html#Push_Queues_and_Backends . looks like that's _target in the deferred lib.

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  4. Jim23 December, 2011 09:09

    Now I feel silly for missing that.

    ReplyDelete
  5. Anonymous23 December, 2011 15:51

    it was added at some point. i think the same time we added backends. the docs are probably even newer.

    ReplyDelete