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https://issues.apache.org/jira/browse/MESOS-5350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jie Yu updated MESOS-5350:
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Story Points: 5 (was: 2)
> Add asynchronous hook for validating docker containerizer tasks
> ---------------------------------------------------------------
>
> Key: MESOS-5350
> URL: https://issues.apache.org/jira/browse/MESOS-5350
> Project: Mesos
> Issue Type: Improvement
> Components: docker, modules
> Reporter: Joseph Wu
> Assignee: Joseph Wu
> Priority: Minor
> Labels: containerizer, hooks, mesosphere
> Fix For: 0.29.0
>
>
> It is possible to plug in custom validation logic for the MesosContainerizer
> via an {{Isolator}} module, but the same is not true of the
> DockerContainerizer.
> Basic logic can be plugged into the DockerContainerizer via {{Hooks}}, but
> this has some notable differences compared to isolators:
> * Hooks are synchronous.
> * Modifications to tasks via Hooks have lower priority compared to the task
> itself. i.e. If both the {{TaskInfo}} and
> {{slaveExecutorEnvironmentDecorator}} define the same environment variable,
> the {{TaskInfo}} wins.
> * Hooks have no effect if they fail (short of segfaulting)
> i.e. The {{slavePreLaunchDockerHook}} has a return type of {{Try<Nothing>}}:
> https://github.com/apache/mesos/blob/628ccd23501078b04fb21eee85060a6226a80ef8/include/mesos/hook.hpp#L90
> But the effect of returning an {{Error}} is a log message:
> https://github.com/apache/mesos/blob/628ccd23501078b04fb21eee85060a6226a80ef8/src/hook/manager.cpp#L227-L230
> We should add a hook to the DockerContainerizer to narrow this gap. This new
> hook would:
> * Be called at roughly the same place as {{slavePreLaunchDockerHook}}
> https://github.com/apache/mesos/blob/628ccd23501078b04fb21eee85060a6226a80ef8/src/slave/containerizer/docker.cpp#L1022
> * Return a {{Future}} and require splitting up
> {{DockerContainerizer::launch}}.
> * Prevent a task from launching if it returns a {{Failure}}.
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