zhihai xu created YARN-2679:

             Summary: add container launch prepare time metrics to NM.
                 Key: YARN-2679
                 URL: https://issues.apache.org/jira/browse/YARN-2679
             Project: Hadoop YARN
          Issue Type: Bug
          Components: nodemanager
    Affects Versions: 2.5.0
            Reporter: zhihai xu
            Assignee: zhihai xu

add metrics in NodeManagerMetrics to get prepare time to launch container.
The prepare time is the duration between sending 
ContainersLauncherEventType.LAUNCH_CONTAINER event and receiving  
ContainerEventType.CONTAINER_LAUNCHED event.

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