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From "Benjamin Mahler (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (MESOS-422) Master leader election should be more robust to stale ephemeral nodes
Date Fri, 21 Jun 2013 18:30:27 GMT

     [ https://issues.apache.org/jira/browse/MESOS-422?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Benjamin Mahler reassigned MESOS-422:
-------------------------------------

    Assignee: Jiang Yan Xu  (was: Benjamin Mahler)

Assigning to Jiang as he's working on cleaning up the detector / contender logic.
                
> Master leader election should be more robust to stale ephemeral nodes
> ---------------------------------------------------------------------
>
>                 Key: MESOS-422
>                 URL: https://issues.apache.org/jira/browse/MESOS-422
>             Project: Mesos
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.9.0, 0.10.0, 0.11.0, 0.12.0, 0.13.0
>            Reporter: Bill Farner
>            Assignee: Jiang Yan Xu
>            Priority: Minor
>             Fix For: 0.14.0
>
>
> When a leading master exits abruptly, it may fatefully restart and think it's the leader.
 If particularly unlucky, this could result in a set of masters that are indefinitely unstable.
> Sequence of events:
> - Master process becomes leader
> - Master process exits, session expiration counter begins
> - Master process restarts, reads leader node contents, and decides it's the leader (based
on PID equality)
> - Previous master session expires, node is deleted
> - Master decides a different master is leader, commits suicide
> - Rinse, repeat for newly-created master node
> The salient fact here is that leaders should be concerned with "did i create the leader
node" (ignoring node data) while clients want to be apprised of leader's node data.
> Relevant code:
> https://github.com/apache/mesos/blob/trunk/src/detector/detector.cpp#L548
> ZK leader election recipe, for reference:
> http://zookeeper.apache.org/doc/trunk/recipes.html#sc_leaderElection

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