alexkli commented on issue #2852: invoker: use locally available image if 
docker pull fails
URL: 
https://github.com/apache/incubator-openwhisk/pull/2852#issuecomment-344959222
 
 
   An easily configurable prefix would work as well.
   
   I just generally find the notion of ?check network first, if it fails, 
abort, and only then check locally? a bit weird. You?d expect the opposite, 
plus maybe some interval when it would check for new  versions. It would also 
save time when you avoid the docker pull done every time.
   
   Also, I believe docker run will do a docker pull implicitly if an image is 
not found locally. So you?d only need docker pull for updates to existing 
images.

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