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From "Tom Arnfeld" <>
Subject Re: Question about External Containerizer
Date Wed, 03 Dec 2014 10:47:54 GMT
Hi Diptanu,

That's correct, the ECP has the responsibility of updating the resource for a container, and
it will do as new tasks are launched and killed for an executor. Since docker doesn't support
this, our containerizer (Deimos does the same) goes behind docker to the cgroup for the container
and updates the resources in a very similar way to the mesos-slave. I believe this is also
what the built in Docker containerizer will do.



Tom Arnfeld

Developer // DueDil

On Wed, Dec 3, 2014 at 10:45 AM, Diptanu Choudhury <>

> Hi,
> I had a quick question about the external containerizer. I see that once
> the Task is launched, the ECP can receive the update calls, and the
> protobuf message passed to ECP with the update call is containerizer::Update
> .
> This protobuf has a Resources [list] field so does that mean Mesos might
> ask a running task to re-adjust the enforced resource limits?
> How would this work if the ECP was launching docker containers because
> Docker doesn't allow changing the resource limits once the container has
> been started?
> I am wondering how does Deimos and mesos-docker-containerizer handle this.
> -- 
> Thanks,
> Diptanu Choudhury
> Web -
> Twitter - @diptanu <>
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