python - With Celery Canvas, what is the difference between chord() and chain(group(), task) -

-

we're implementing workflow celery. first need run tasks in parallel, , when finished need run single task.

it seems can use chord, or group , chain:

chord(tasks, task)

vs

group(tasks) | task

what exact difference between two? seem same thing.

the canvas docs

chaining group task automatically upgrade chord:

c3 = (group(add.s(i, i) in xrange(10)) | xsum.s())

res = c3()

res.get()

90


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