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How to monitor every node memory usage, is the cached memory means occupied with process?

Rising Star

Hi there,

We had setup a dev environment Hortonworks with 1 Namenode and 4 Datanodes, I am trying to familiarise myself with the Ambari, under host, when I checked on the memory usage, it only shows cached memory instead of used memory, does it based on the application that is running on the cluster? We have 40GB memory per data node, however it doesn't show 40GB on the graph.

I have uploaded the screenshot here.