Gilbert Song created MESOS-8886:
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             Summary: Task in UNREACHABLE forever if a new agent register with 
the same IP when the old agent is unreachable state.
                 Key: MESOS-8886
                 URL: https://issues.apache.org/jira/browse/MESOS-8886
             Project: Mesos
          Issue Type: Bug
          Components: master
            Reporter: Gilbert Song


For partition aware framework, if a new agent register with the master using 
the old agent's IP address (the old agent is in the UNREACHABLE state), the 
task (in UNREACHABLE state) should be transitioned to a terminal state when the 
old agent is removed.

Some backgrounds:
When a new agent register with the master using the old agent's IP address:
1. if the old agent is in DISCONNECTED state, the master will remove the old 
agent and mark all old tasks as LOST;
2. if the old agent is in UNREACHABLE state, the master will remove the old 
agent but the task states are not updated.



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