rabbah commented on issue #2852: invoker: use locally available image if docker 
pull fails
URL: 
https://github.com/apache/incubator-openwhisk/pull/2852#issuecomment-344464469
 
 
   A semantic change could be observed here - if an image is removed from 
docker hub, the pull will fail. However the action will continue to run in a 
particular invoker which has a previously pulled image, until that image is 
purged locally. This is a new behavior. 
   
   We should separate the convenience of local development from resilience to 
network partitions. An option for the former is to restore an implicit pull 
bypass if the image prefix matches the local registry prefix. This could be 
done with a feature toggle through ansible as well for added control. 

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