[jira] [Created] (MESOS-808) The scheduler driver should queue messages when disconnected.

["Benjamin Mahler (JIRA)" <ji...@apache.org>]

Benjamin Mahler created MESOS-808:
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             Summary: The scheduler driver should queue messages when disconnected.
                 Key: MESOS-808
                 URL: https://issues.apache.org/jira/browse/MESOS-808
             Project: Mesos
          Issue Type: Improvement
            Reporter: Benjamin Mahler


Currently when schedulers try to take an action while the driver is disconnected (i.e. a call to SchedulerDriver::disconnected has occurred), the driver will drop the request.

In the case of launching a task, we'll reply with TASK_LOST directly in the driver. However, with things like killTask, we simply drop the kill task request.

This behavior seems a little unfriendly for schedulers, as they need to be concerned about queueing any operations until Scheduler::connected is called. We should consider queuing in the driver instead.

The implementation here can consist of a queue<Message> holding the messages that were constructed while !connected. Once we re-connect, we simply run through this queue sending all messages.

However, without state in the driver, schedulers will have to live with the possibility of dropped messages anyway (i.e. if they fail while disconnected, any messages will be lost).



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