Joseph Wu created MESOS-9934:

             Summary: Master does not handle returning unreachable agents as 
                 Key: MESOS-9934
             Project: Mesos
          Issue Type: Bug
          Components: master
            Reporter: Joseph Wu
            Assignee: Joseph Wu

The master has two code paths for handling agent reregistration messages, one 
culminating in {{Master::___reregisterSlave}} and the other in 
{{Master::}}{{__reregisterSlave}}. The two paths are not continuations of each 
other.  Looks like we missed the double-underscore case in the initial 
implementation.  This is the path that unreachable agents take, when/if they 
come back to the cluster.  The result is that when unreachable agents are 
marked for draining, they do not get sent the appropriate message unless they 
are forced to reregister again (i.e. restarted manually).

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