[jira] [Created] (MESOS-5181) Master should reject calls from the scheduler driver if the scheduler is not connected.

["Joseph Wu (JIRA)" <ji...@apache.org>]

Joseph Wu created MESOS-5181:
--------------------------------

             Summary: Master should reject calls from the scheduler driver if the scheduler is not connected.
                 Key: MESOS-5181
                 URL: https://issues.apache.org/jira/browse/MESOS-5181
             Project: Mesos
          Issue Type: Bug
          Components: scheduler driver
    Affects Versions: 0.24.0
            Reporter: Joseph Wu
            Assignee: Anand Mazumdar


When a scheduler registers, the master will create a link from master to scheduler.  If this link breaks, the master will consider the scheduler {{inactive}} and {{disconnected}}.

This causes a couple problems:
1) Master does not send offers to {{inactive}} schedulers.  But these schedulers are still considered "registered".
2) Any calls from the {{inactive}} scheduler is still accepted, which leaves the scheduler in a starved, but semi-functional state.

See the related issue for more context: MESOS-5180

There should be an additional guard for registered, but {{inactive}} schedulers here:
https://github.com/apache/mesos/blob/94f4f4ebb7d491ec6da1473b619600332981dd8e/src/master/master.cpp#L1977

The HTTP API already does this:
https://github.com/apache/mesos/blob/94f4f4ebb7d491ec6da1473b619600332981dd8e/src/master/http.cpp#L459

Since the scheduler driver cannot return a 403, it may be necessary to return a {{Event::ERROR}} and force the scheduler to abort.



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)