[jira] [Created] (MESOS-6676) Always re-link with scheduler during re-registration

["Neil Conway (JIRA)" <ji...@apache.org>]

Neil Conway created MESOS-6676:
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             Summary: Always re-link with scheduler during re-registration
                 Key: MESOS-6676
                 URL: https://issues.apache.org/jira/browse/MESOS-6676
             Project: Mesos
          Issue Type: Bug
          Components: master
            Reporter: Neil Conway
            Assignee: Neil Conway


Scenario:

# Framework registers with master using a non-zero {{failover_timeout}} and is assigned a FrameworkID.
# The master sees an {{ExitedEvent}} for the master->scheduler link. This could happen due to some transient network error, e.g., 1-way partition. The master sends a {{FrameworkErrorMessage}} to the framework. The master marks the framework as disconnected, but keeps the {{Framework*}} for it around in {{frameworks.registered}}.
# The framework doesn't receive the {{FrameworkErrorMessage}} because it is dropped by the network.
# The scheduler might receive an {{ExitedEvent}} for the scheduler -> master link, but it ignores this anyway (see MESOS-887).
# The scheduler sees a new-master-detected event and re-registers with the master. It doesn _not_ set the {{force}} flag. This means we follow [this code path|https://github.com/apache/mesos/blob/a6bab9015cd63121081495b8291635f386b95a92/src/master/master.cpp#L2771] in the master, which does _not_ relink with the scheduler.

The result is that scheduler re-registration succeds, but the master -> scheduler link is never re-established.



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