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Looks good, just some minor notes below.


src/master/allocator/mesos/hierarchical.cpp
Lines 488-505 (original), 488-522 (patched)
<https://reviews.apache.org/r/70967/#comment303312>

    Have you considered implementing the TODO to tidy this up?
    
    ```
    const set<string> removedRoles = oldRoles - newRoles;
    const set<string> addedRoles = newRoles - oldRoles;
    
    const set<string> newSuppressedRoles = suppressedRoles - oldSuppressedRoles;
    const set<string> oldSuppressedRoles = oldSuppressedRoles - suppressedRoles;
    ```
    
    Needs adding a function here that uses std::set_difference:
    
    
https://github.com/apache/mesos/blob/1.8.0/3rdparty/stout/include/stout/set.hpp
    
    Of course, feel free to do this after the fix.



src/master/allocator/mesos/hierarchical.cpp
Lines 498 (patched)
<https://reviews.apache.org/r/70967/#comment303310>

    No need for this note, it's obvious? (whereas the latter note is nice since 
there is something suprising, see below)



src/master/allocator/mesos/hierarchical.cpp
Lines 515 (patched)
<https://reviews.apache.org/r/70967/#comment303311>

    This is actually suprising, a role that is removed from both 
`FramworkInfo.roles` and `suppressedRoles` is not being unsuppressed, so why 
store it in the set?
    
    Looking at your next patch, it looks like we indeed skip any entries that 
are also in `removedRoles` anyway? Might as well not include them in the set?
    
    If you'd like to keep the this patch as purely cleanup, perhaps make this 
NOTE a TODO to not consider removed roles to be unsuppressed, and have the next 
patch make that adjustment?


- Benjamin Mahler


On June 27, 2019, 7:37 p.m., Andrei Sekretenko wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/70967/
> -----------------------------------------------------------
> 
> (Updated June 27, 2019, 7:37 p.m.)
> 
> 
> Review request for mesos, Benjamin Mahler and Meng Zhu.
> 
> 
> Bugs: MESOS-9870
>     https://issues.apache.org/jira/browse/MESOS-9870
> 
> 
> Repository: mesos
> 
> 
> Description
> -------
> 
> This patch moves the state-manipulating bits closer together, replaces
> the misleading NewRevivedRoles name with NewUnsuppressedRoles and adds
> const qualifiers to locals.
> 
> This is a prerequisite to fix of MESOS-9870 bug in the next patch.
> 
> 
> Diffs
> -----
> 
>   src/master/allocator/mesos/hierarchical.cpp 
> 26aad6778f12b99bb87c846788d6b6d60f743d8a 
> 
> 
> Diff: https://reviews.apache.org/r/70967/diff/1/
> 
> 
> Testing
> -------
> 
> make check
> 
> 
> Thanks,
> 
> Andrei Sekretenko
> 
>

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