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From Andrei Sekretenko <asekrete...@mesosphere.io>
Subject Re: Review Request 71488: Track per-role and per-agent allocated resources in the allocator.
Date Fri, 04 Oct 2019 18:30:15 GMT


> On Oct. 2, 2019, 7:51 p.m., Meng Zhu wrote:
> > src/master/allocator/mesos/hierarchical.hpp
> > Lines 412 (patched)
> > <https://reviews.apache.org/r/71488/diff/4/?file=2167266#file2167266line412>
> >
> >     why do we need to track this in the agent?
> >     
> >     Also, need to include this change in the summary and description.

Two reasons:
1. Now that MESOS-621 has been fixed, it is enough for master to call `removeSlave()` on agent
removal, no need to recover resources in the allocator separately. I don't want to ruin this.
2. Even if we require that master somehow notifies allocator about allocated `Resources` on
the agent being removed (so that we don't have to track it in the allocator), we will have
to choose between:
 - requiring that this notification always happens before `removeSlave()` (insanely fragile,
IMO)
 - treating a Role which doesn't have anything but allocated resources as non-empty (currently,
we just CHECK that an empty role does not have allocated resources - this already helped me
to avoid a bug or two).

Added a comment, included into summary and description.


- Andrei


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On Oct. 4, 2019, 6:30 p.m., Andrei Sekretenko wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/71488/
> -----------------------------------------------------------
> 
> (Updated Oct. 4, 2019, 6:30 p.m.)
> 
> 
> Review request for mesos, Benjamin Mahler and Meng Zhu.
> 
> 
> Bugs: MESOS-9949
>     https://issues.apache.org/jira/browse/MESOS-9949
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> This patch adds tracking of per-role allocated resources in the
> allocator's roles tree. Also, tracking of per-agent allocated resources
> is added to facilitate correct untracking of the role's allocated
> resources on agent removal.
> 
> 
> Diffs
> -----
> 
>   src/master/allocator/mesos/hierarchical.hpp d42124f534536ad044bff9878d242892fa042f24

>   src/master/allocator/mesos/hierarchical.cpp 47281542792486854b71c7e75dfa8ea3ee3ef3fc

> 
> 
> Diff: https://reviews.apache.org/r/71488/diff/5/
> 
> 
> Testing
> -------
> 
> 
> Thanks,
> 
> Andrei Sekretenko
> 
>


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