You must use the control module from the mapreduce module
One line in the doc tells you to chain MR tasks use a done callback
and start a new one with the control submodule.
Use this method to start a task from inside a cron handler
Have a look at mapreduce/control.py and the test code for control.py
from mapreduce import control as mr_control
class MRCronHandler(webapp.RequestHandler):
def get(self):
mr_control.start_map(
"Name of the task",
"mymr.sometask",
"mapreduce.input_readers.DatastoreInputReader",
{"entity_kind": "models.SomeModel",
},
mapreduce_parameters={"done_callback": "/mr-end-task"},
)
self.response.headers['Content-Type'] = 'text/plain'
self.response.out.write('MR Cron Started')
2010/10/24 slash <ewan...@gmail.com>:
> Hi, everybody
>
> I learned a lot from this group and Nick's blog. Thanks.
>
> I want to combine mapreduce and cron job in order to run mapping
> automatically. I did lots of search in this group and from other
> resource but I got nothing.
>
> I'm able to run cron job and mapreduce separately. But I really
> don't know how to combine them. Maybe I missed something really basic.
>
> Could anyone tell me how to run mapreduce with cron job? I didn't
> find the corresponding url to trigger mapreduce. Thank you.
>
> PS: I know that it's possible to do this and I subscribe issue 41
> in appengine-mapreduce project.
>
> Here is the link:
> http://code.google.com/p/appengine-mapreduce/issues/detail?id=41.
>
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