Jay Guo updated MESOS-3505:
    Assignee:     (was: Jay Guo)

> Support specifying Docker image by Image ID.
> --------------------------------------------
>                 Key: MESOS-3505
>                 URL: https://issues.apache.org/jira/browse/MESOS-3505
>             Project: Mesos
>          Issue Type: Story
>            Reporter: Yan Xu
>              Labels: mesosphere
> A common way to specify a Docker image with the docker engine is through 
> {{repo:tag}}, which is convenient and sufficient for most people in most 
> scenarios. However this combination is neither precise nor immutable.
> For this reason, it's possible when an image with a {{repo:tag}} already 
> cached locally on an agent host and a task requiring this {{repo:tag}} 
> arrives, it's using an image that's different than the one the user intended.
> Docker CLI already supports referring to an image by {{repo@id}}, where the 
> ID can have two forms:
> * v1 Image ID
> * digest
> Native Mesos provisioner should support the same for Docker images. IMO it's 
> fine if image discovery by ID is not supported (and thus still requiring 
> {{repo:tag}} to be specified) (looks like [v2 
> registry|http://docs.docker.com/registry/spec/api/] does support it) but the 
> user can optionally specify an image ID and match it against the cached / 
> newly pulled image. If the ID doesn't match the cached image, the store can 
> re-pull it; if the ID doesn't match the newly pulled image (manifest), the 
> provisioner can fail the request without having the user unknowingly running 
> its task on the wrong image.

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