zhihai xu created YARN-2679:
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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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