#celery

hi, I'd like to pick your collective brains on something. I have a task that should spawn two chained tasks. The "the first child renders html, the second renders a pdf output from the html". But I need to access the results of the two renderers after completion in an asynchronous way (polling web request)

eltigre, use chain: http://docs.celeryproject.org/en/latest/usergui...

yes I've been reading that

hm I think my misunderstanding is around the return result of chain

I somehow was under the impression that the first task is returned, but the actual async_result refers to the last element in the chain rather than the first, doesn't it?

eltigre, no, it refers to the first task in chain

then how do I know the async_result of the final task at the time of starting the chain?

you can access subtasks with .children attribute, as shown in example

is children availabe before task completion?

eltigre, of course. Children is a list of AsyncResult instances

ah ok

that makes sense

list of lists of lists etc

thank you

I've got a large html text in a task result... is there a way to supress printing out the result in the console? While still having all the print messages?

sorry I found a way

I have a django project/app that works fine with Celery on linux. In Windows, if I install using pip either system-wide or in a virtualenv, when I start celery the workers continuously exit with signal -1. If I run celery against a copy of my project just placed in My Documents, it works fine. Windows 7 64bit.

What might I have done wrong such that Celery won't work if my project is 'installed'? Project is OpenREM (http://openrem.org)

Celery function only added in current version that is in beta (0.4.3b4)

Both the First steps with Celery and First steps with Django work fine, as does using OpenREM as long as it isn't 'installed'

If anyone has any ideas about why my django project doesn't work with Celery when pip installed, please shout. If I don't catch the response, I can be found @_OpenREM on twitter. Any help, suggestions appreciated.

hi all.

I'm running celery/django under supervisor with a rabbitmq broker

sometimes if I restart it, celery won't connect to the broker. I get the list of tasks, but then not the "connecting to broker, mingling" message

alastairp: when you restart celeryd and dont get teh message do you get erros if you then try to push tasks anyway?

frodopwns: it won't receive any tasks. If I ask for all connected workers it won't show up (e.g. with app.control)

normally if i shut it down and start it again it'll come up and find the job that was sent to it

I'm wondering if it might be a supervisor problem, I've had troubles with it in the past not starting/restarting services properly

but it seems weird that celery gets half way there and then stops

you could test the init.d scritp pretty easily

alternatively, it could well be a problem connecting to the broker - dns, network timeout

shoudl giv eyou an idea of whether the problem is indeed with supervisor

is your broker not local?

correct