[jira] [Created] (MESOS-1456) Metric lifetime should be tied to process runstate, not lifetime.

["Dominic Hamon (JIRA)" <ji...@apache.org>]

Dominic Hamon created MESOS-1456:
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             Summary: Metric lifetime should be tied to process runstate, not lifetime.
                 Key: MESOS-1456
                 URL: https://issues.apache.org/jira/browse/MESOS-1456
             Project: Mesos
          Issue Type: Bug
          Components: statistics
    Affects Versions: 0.19.0
            Reporter: Dominic Hamon
            Assignee: Dominic Hamon


The usual pattern for termination of processes is {{terminate(..); wait(..); delete ..;}} but the {{SchedulerProcess}} is terminated and then deleted some time later.

If the metrics endpoint is accessed within that period, it never returns as it tries to access a {{Gauge}} that has a reference to a valid PID that is not getting any timeslices (the {{SchedulerProcess}}). A one-off fix can be made to the {{SchedulerProcess}} to move the metrics add/remove calls to {{initialize}} and {{finalize}}, but this should be the general pattern for every process with metrics. 



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