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From Benjamin Mahler <bmah...@apache.org>
Subject Re: Review Request 65334: Added quota limit to the master API protos.
Date Wed, 11 Apr 2018 01:32:00 GMT


> On March 18, 2018, 8:27 p.m., Meng Zhu wrote:
> > include/mesos/master/master.proto
> > Lines 206 (patched)
> > <https://reviews.apache.org/r/65334/diff/4/?file=1973245#file1973245line206>
> >
> >     Why we are making it a repeated field? What is the usage case?

Much like `UpdateWeights`, the use case is to atomically update quota for multiple roles.
Otherwise, we expose a races and the user has to work around them.

For example, I want to transfer 10cpus of "a"'s quota to "b". With this API I can directly
update both in the same call, and the update will occur in an all-or-nothing manner. Without
this, I should probably increase "b"'s quota first to avoid someone else taking the excess
quickly after I reduce "a". This puts the cluster potentially in a temporary overcommit, and
if the master fails or if my tooling fail, I got stuck halfway and need to figure out how
to undo or recover from the failure and proceed.


- Benjamin


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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/65334/#review199391
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On March 10, 2018, 1:46 a.m., Benjamin Mahler wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/65334/
> -----------------------------------------------------------
> 
> (Updated March 10, 2018, 1:46 a.m.)
> 
> 
> Review request for mesos, Alexander Rukletsov, Michael Park, and Meng Zhu.
> 
> 
> Bugs: MESOS-8487
>     https://issues.apache.org/jira/browse/MESOS-8487
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> This introduces a `limit` in `QuotaInfo` and `QuotaRequest`.
> 
> A new `UPDATE_QUOTA` master call is added as a replacement of
> `SET_QUOTA` and `REMOVE_QUOTA`, which provides the new semantics
> of unset limit meaning "no limit" and unset guarantee meaning
> "no guarantee".
> 
> The new APIs are marked as experimental for now.
> 
> 
> Diffs
> -----
> 
>   include/mesos/master/master.proto 6622e1b82861f380346f505eca326f7174dd8bd6 
>   include/mesos/quota/quota.proto f2ed6f555e1e7b0290fefa3e301c9bdbf550bd11 
>   include/mesos/v1/master/master.proto 6034bd5af8ad764f625f9fe80be08b48707bbadb 
>   include/mesos/v1/quota/quota.proto 5dd772fee46f740b062827ed7c9704c26187cb12 
>   src/master/http.cpp cf03d8bf7df583c849a3b2a326d3772820181b0f 
>   src/master/validation.cpp 9254cd22e67d9aca53135701575fb0857ff6f7d6 
> 
> 
> Diff: https://reviews.apache.org/r/65334/diff/4/
> 
> 
> Testing
> -------
> 
> make check
> 
> 
> Thanks,
> 
> Benjamin Mahler
> 
>


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