目的：ambari-metrics是一个很容易出问题挂掉的组件，如果无法重启的情况下。我们可以舍弃之前集群的监控数据，然后进行格式化恢复。
注:操作后历史监控数据不可恢复
This is usually due to AMS Data being corrupt.
1.Shut down Ambari Monitors, and Collector via Ambari
2.Cleared out the /var/lib/ambari-metrics-collector dir for fresh restart
3.From Ambari -> Ambari Metrics -> Config -> Advanced ams-hbase-site get the hbase.rootdir and hbase-tmp directory
4.Delete or Move the hbase-tmp and hbase.rootdir directories to an archive folder
5.Started AMS.
6.All services will came online and graphs started to display, after a few minutes
