[GitHub] [incubator-openwhisk] style95 commented on issue #4460: How to specify -v parameter for docker containers that run functions?

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style95 commented on issue #4460: How to specify -v parameter for docker containers that run functions?
URL: https://github.com/apache/incubator-openwhisk/issues/4460#issuecomment-486939310
 
 
   @YangZhou1997 
   What kinds of scenario do you keep in your mind?
   IMHO, it is not that simple to provide volume mapping features in OpenWhisk.
   
   Currently, it is not guaranteed for actions to run on the same invoker, it's not easy to mount the same directory on each call. Even if a container runs with volume mapping, it will be paused after 50ms.
   Since we can add volume at container creation time, it will induce a bigger ColdStart time.
   And if you are thinking of a shared volume at the host level, you need to take care of a concurrent modification issue. Also, one user's volume should not be accessed by the others, you need proper permission and multi-tenancy support as well. I think there might be more issues than I described.
   So it is generally recommended to use object storages for serverless.
   
   If you still want to try the way, I think `DockerClient` would be a good starting point.
   Since users should be able to configure their volume, one option could be relying on annotations.
   So users would specify volume information in annotation and OpenWhisk adds volume mapping based on the information at container creation time. 
   
   Since I pondered on this shortly and naively, please consider that there would be some issues.
   
   And you may find this useful for this kind of discussion.
   https://github.com/apache/incubator-openwhisk/blob/master/CONTRIBUTING.md#discussion
   
   We have slack channels and dev mailing list.

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