[jira] [Created] (MESOS-9701) Allocator's roles map should track reservations.

[Benjamin Mahler (JIRA)]

Benjamin Mahler created MESOS-9701:
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             Summary: Allocator's roles map should track reservations.
                 Key: MESOS-9701
                 URL: https://issues.apache.org/jira/browse/MESOS-9701
             Project: Mesos
          Issue Type: Improvement
          Components: allocation
            Reporter: Benjamin Mahler


Currently, the allocator's {{roles}} map only tracks roles that have 
allocations or framework subscriptions:

https://github.com/apache/mesos/blob/1.7.2/src/master/allocator/mesos/hierarchical.hpp#L531-L535

And we separately track a map of total reservations for each role:

https://github.com/apache/mesos/blob/1.7.2/src/master/allocator/mesos/hierarchical.hpp#L541-L547

Confusingly, the {{roles}} map won't have an entry when there is a reservation 
for a role but no allocations or frameworks subscribed. We should ensure that 
the map has an entry when there are reservations. Also, we can consolidate the 
reservation information and framework ids into the same map, e.g.:

{code}
struct Role
{
  hashset<FrameworkID> frameworkIds;
  ResourceQuantities totalReservations;
};

hashmap<string, Role> roles;
{code}



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