resource offers after task failure

[Hendrik Haddorp <he...@gmx.net>]

Hi,

I'm using Mesos 0.28.2 and my own framework, which uses dynamic 
reservations. A task failed and shortly after that I received a resource 
offers call that did not contain my reserved resources. I had expected 
that the request would already contain my reserved resources that are 
now not used anymore. Is it normal that the reserved resources are only 
available a bit after the task ended?

Further more it looks like I also sometimes receive a resource offers 
request that only lists my reserved resources but no resources that are 
still available for reservation.

regards,
Hendrik

Re: resource offers after task failure

[Benjamin Mahler <bm...@apache.org>]

Hi Hendrik,


> Is it normal that the reserved resources are only available a bit after
> the task ended?


Yes, that's normal since we don't block the forwarding of the terminal
status update behind the allocation of the freed resources. Since the
latter can take some time, we opt to forward the status immediately and as
a result there can be intermediate offers for resources on the agent before
the reserved resources are re-offered.

Further more it looks like I also sometimes receive a resource offers
> request that only lists my reserved resources but no resources that are
> still available for reservation.


It's possible for the available resources on a single agent to be
fragmented across offers.

Ben

On Fri, Feb 24, 2017 at 7:43 AM, Hendrik Haddorp <he...@gmx.net>
wrote:

> Hi,
>
> I'm using Mesos 0.28.2 and my own framework, which uses dynamic
> reservations. A task failed and shortly after that I received a resource
> offers call that did not contain my reserved resources. I had expected that
> the request would already contain my reserved resources that are now not
> used anymore. Is it normal that the reserved resources are only available a
> bit after the task ended?
>
> Further more it looks like I also sometimes receive a resource offers
> request that only lists my reserved resources but no resources that are
> still available for reservation.
>
> regards,
> Hendrik
>