[jira] [Commented] (MESOS-9178) Add a metric for master failover time.

["James Peach (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MESOS-9178?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16589159#comment-16589159 ] 

James Peach commented on MESOS-9178:
------------------------------------

/cc [~bmahler]

> Add a metric for master failover time.
> --------------------------------------
>
>                 Key: MESOS-9178
>                 URL: https://issues.apache.org/jira/browse/MESOS-9178
>             Project: Mesos
>          Issue Type: Improvement
>          Components: master
>            Reporter: Xudong Ni
>            Assignee: Xudong Ni
>            Priority: Minor
>
> Quote from Yan Xu: Previous the argument against it is that you don't know if all agents are going to come back after a master failover so there's not a certain point that marks the end of "full reregistration of all agents". However empirically the number of agents usually don't change during the failover and there's an upper bound of such wait (after a 10min timeout the agents that haven't reregistered are going to be marked unreachable so we can just use that to stop the timer.
> So we can define failover time as "the time it takes for all agents recovered from the registry to be accounted for" i.e., either reregistered or marked as unreachable.
> This is of course looking at failover from an agent reregistration perspective.
> Later after we add framework info persistence, we can similarly define the framework perspective using reregistration time or reconciliation time.



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