[jira] [Reopened] (MESOS-295) Allow new masters to have better understanding of cluster state

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

     [ https://issues.apache.org/jira/browse/MESOS-295?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benjamin Mahler reopened MESOS-295:
-----------------------------------

      Assignee: Benjamin Mahler  (was: Benjamin Hindman)

Reopening, since this has not been implemented.

> Allow new masters to have better understanding of cluster state
> ---------------------------------------------------------------
>
>                 Key: MESOS-295
>                 URL: https://issues.apache.org/jira/browse/MESOS-295
>             Project: Mesos
>          Issue Type: Improvement
>            Reporter: Joe Smith
>            Assignee: Benjamin Mahler
>            Priority: Critical
>              Labels: twitter
>
> If a new master becomes elected, it will only have knowledge of the current state of the cluster. This can lead to a situation where tasks become lost but aren't properly killed. For instance:
> 1) A set of machines (perhaps a datacenter rack) lose network connectivity and their tasks are marked LOST by the master. However, they're still running.
> 2) Through a potentially unrelated situation, there is a master failover to a new master
> 3) The network connection to the machines come back up
> 4) These slaves never killed their tasks (and they shouldn't if they can't talk to a master)
> 5) Tasks stay running and aren't killed, taking up resources and running outside the scope of the new master



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