Ilya Pronin created MESOS-7867:

             Summary: Master doesn't handle scheduler driver downgrade from 
HTTP based to PID based
                 Key: MESOS-7867
             Project: Mesos
          Issue Type: Bug
          Components: master
    Affects Versions: 1.3.0
            Reporter: Ilya Pronin
            Assignee: Ilya Pronin

When a framework upgrades from a PID based driver to an HTTP based driver, 
master removes its per-framework-principal metrics ({{messages_received}} and 
{{messages_processed}}) in {{Master::failoverFramework}}. When the same 
framework downgrades back to a PID based driver, the master doesn't reinstate 
those metrics. This causes a crash when the master receives a message from the 
failed over framework and increments {{messages_received}} counter in 
{{Master::visit(const MessageEvent&)}}.

I0807 18:17:45.713220 19095 master.cpp:2916] Framework 
70822e80-ca38-4470-916e-e6da073a4742-0000 (TwitterScheduler) failed over
F0807 18:18:20.725908 19079 master.cpp:1451] Check failed: 

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