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Patch looks great!

Reviews applied: [52827]

Passed command: export OS='ubuntu:14.04' BUILDTOOL='autotools' COMPILER='gcc' 
CONFIGURATION='--verbose' ENVIRONMENT='GLOG_v=1 MESOS_VERBOSE=1'; 
./support/docker_build.sh

- Mesos ReviewBot


On Oct. 13, 2016, 2:38 p.m., Qian Zhang wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/52827/
> -----------------------------------------------------------
> 
> (Updated Oct. 13, 2016, 2:38 p.m.)
> 
> 
> Review request for mesos and Jie Yu.
> 
> 
> Bugs: MESOS-6360
>     https://issues.apache.org/jira/browse/MESOS-6360
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> Previously image layer rootfs path is in the format below regardless
> of which backend is used.
>   <image_store_dir>/layers/<layer_id>/rootfs
> This introduced an issue: when agent is restarted with a different
> backend, we will wrongly handle the whiteout files since different
> backends(e.g., aufs and overlay) have different whiteout standard.
> 
> In this commit, we added backend suffix to image layer rootfs path
> for non-aufs backend like below, so each backend will only handle
> its own image layers.
>   <image_store_dir>/layers/<layer_id>/rootfs.<backend>
> For aufs backend, it is still in the previous format, this is to
> handle backward compatibility.
> 
> So the expected result of this commit is:
> 1. If user switches backend when restarting agent, all the image
> layers of the previous backend in the store will just be ignored.
> 2. In the upgrade case, if user starts a new version of Mesos agent
> with a non-aufs backend (i.e., copy/bind/overlay), then all the
> image layers in the store will just be ignored, but if user starts
> the agent with aufs backend, all the image layers in the store can
> still be used.
> 
> 
> Diffs
> -----
> 
>   src/slave/containerizer/mesos/provisioner/docker/local_puller.cpp 
> 9b09dca5cd8f9e60a90cf574300b250eb18ede35 
>   src/slave/containerizer/mesos/provisioner/docker/metadata_manager.cpp 
> 6456d90220a4026696a04f9969763cf682464353 
>   src/slave/containerizer/mesos/provisioner/docker/paths.hpp 
> 949e0c16a361f22b00e267fcf81093690327041f 
>   src/slave/containerizer/mesos/provisioner/docker/paths.cpp 
> a5cc952072274c61e8c515e8b1b7ea563344e950 
>   src/slave/containerizer/mesos/provisioner/docker/registry_puller.cpp 
> 1e2cc2dda3518d99ef1ad06e2b8ea7f78a4dcf72 
>   src/slave/containerizer/mesos/provisioner/docker/store.cpp 
> 52b9ea934a1dbe3312b8f08f5da8085e9e306de5 
>   src/tests/containerizer/provisioner_docker_tests.cpp 
> 10fbc4149ac2e7503ffe7f2746fbd0e14a2365b4 
> 
> Diff: https://reviews.apache.org/r/52827/diff/
> 
> 
> Testing
> -------
> 
> make check
> 
> 
> Thanks,
> 
> Qian Zhang
> 
>

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