Boto error in a replay about simpleflow HOT 3 CLOSED

Happens again today. It seems it happens when many decisions are taken at once.

Useful informations: http://blog.johnryding.com/ + http://blog.gmane.org/gmane.comp.python.boto/month=20150701

I didn't analyze myself, but if I believe what's told in those articles, the retrieval of temporary credentials can't keep up under load. So either centralize things (to avoid potentially that 100+ decider processes ask the same API in a short period of time) either add some retries to avoid that.

Also we could definitely bake our own retry logic inside swf/core.py, that's probably even simpler.

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(First (perma)link: http://blog.johnryding.com/post/122337566993/solving-intermittent-noauthhandlerfound-errors-in)

A singleton Provider looks only useful in standalone use, so we may want to use @retry as you say

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Fixed in #99 / 0.11.8

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