[jira] [Created] (MESOS-305) Inform the framework about a master failover

["Vinod Kone (JIRA)" <ji...@apache.org>]

Vinod Kone created MESOS-305:
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             Summary: Inform the framework about a master failover
                 Key: MESOS-305
                 URL: https://issues.apache.org/jira/browse/MESOS-305
             Project: Mesos
          Issue Type: Improvement
            Reporter: Vinod Kone


With the recent changes in the master detecter code, we no longer send 'NoMasterDetected' to the scheduler driver, which in turn means the 'disconnected' scheduler callback is never invoked.

At Twitter this manifested as a spew of LOST tasks whenever a master failover happens. This is because the scheduler holds on to offers for a while and never knows about the invalidity of offers, until after tasks are launched. Though this is a race, it is ideal to minimize this window as much as possible by informing the scheduler of the master failover.

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