paul mackles updated SPARK-23943:
    Summary: Improve observability of MesosRestServer  (was: Add more specific 
health check to MesosRestServer)

> Improve observability of MesosRestServer
> ----------------------------------------
>                 Key: SPARK-23943
>                 URL: https://issues.apache.org/jira/browse/SPARK-23943
>             Project: Spark
>          Issue Type: Improvement
>          Components: Deploy, Mesos
>    Affects Versions: 2.2.1, 2.3.0
>         Environment:  
>            Reporter: paul mackles
>            Priority: Minor
>             Fix For: 2.4.0
> Add a more robust health-check to MesosRestServer so that anyone who runs 
> MesosClusterDispatcher as a marathon app can use it to check the health of 
> the server:
> [http://mesosphere.github.io/marathon/docs/health-checks.html]
> Specifically, this check verifies that the MesosSchedulerDriver is still 
> running as we have seen certain cases where it  dies (rather quietly) and the 
> only way to revive it is a restart. With this health check, marathon will 
> restart the dispatcher if the MesosSchedulerDriver stops running. 
> The health check lives at the url "/health" and returns a 204 when the server 
> is healthy and a 503 when it is not (e.g. the MesosSchedulerDriver stopped 
> running).

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