Joseph Wu created MESOS-5181:
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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.
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