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From "Alexander Rukletsov (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MESOS-6360) The handling of whiteout files in provisioner is not correct.
Date Wed, 02 Nov 2016 11:43:58 GMT

     [ https://issues.apache.org/jira/browse/MESOS-6360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alexander Rukletsov updated MESOS-6360:
---------------------------------------
    Summary: The handling of whiteout files in provisioner is not correct.  (was: The handling
of whiteout files in provisioner is not correct)

> The handling of whiteout files in provisioner is not correct.
> -------------------------------------------------------------
>
>                 Key: MESOS-6360
>                 URL: https://issues.apache.org/jira/browse/MESOS-6360
>             Project: Mesos
>          Issue Type: Bug
>            Reporter: Qian Zhang
>            Assignee: Qian Zhang
>            Priority: Blocker
>
> Currently when user launches a container from a Docker image via universal containerizer,
we always handle the whiteout files in {{ProvisionerProcess::__provision()}} regardless of
which backend is used.
> However this is actually not correct, because the way to handle whiteout files is backend
dependent, that means for different backends, we need to handle whiteout files in different
ways, e.g.:
> * AUFS backend: It seems the AUFS whiteout ({{.wh.<filename/dirname>}} and {{.wh..wh..opq}})
is the whiteout standard in Docker (see [this comment | https://github.com/docker/docker/blob/v1.12.1/pkg/archive/archive.go#L259:L262]
for details), so that means after the Docker image is pulled, its whiteout files in the store
are already in aufs format, then we do not need to do anything about whiteout file handling
because the aufs mount done in {{AufsBackendProcess::provision()}} will handle it automatically.
> * Overlay backend: Overlayfs has its own whiteout files (see [this doc | https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt]
for details), so we need to convert the aufs whiteout files to overlayfs whiteout files before
we do the overlay mount in {{OverlayBackendProcess::provision}} which will automatically handle
the overlayfs whiteout files.
> * Copy backend: We need to manually handle the aufs whiteout files when we copy each
layer in {{CopyBackendProcess::_provision()}}.



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