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FAILED NOT RESTARTABLE is a common error condition in the Node Manager environment. During the heavy load on the Managed Server, the node manager thinks that it is not responsive and try to start the already running Managed Server then it throws the error.
1.Kill the Managed Server process and Node Manager process safely
2.Start Node Manager
3. Let the Node Manager to start the Managed Server.
you should be good.
If you do not want to get this issue in the future, work on your performance tuning and capacity planning well.