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From Aravindan Vijayan <>
Subject Re: how to interpret the host metrics retrieved from Rest API
Date Wed, 08 Feb 2017 17:12:03 GMT
Hi Massimilian,

Ambari Metrics Service uses psutil library to collect system metrics. The metrics's explanation
can be found here -

In case there is no metric in psutil with a given name in AMS, it might have been re-named.
Please refer to the following file for renaming -

Thanks and Regards,
Aravindan Vijayan

From: Massimilian Mattetti
Reply-To: "<>"
Date: Wednesday, February 8, 2017 at 12:41 AM
To: "<>"
Subject: how to interpret the host metrics retrieved from Rest API

Hi all,

I am trying to monitor the resource usage of a cluster by pulling the metrics from the rest
API of Ambari (Version I am sending request with the following path:

There are few metrics that are really hard to understand. For instance, the metrics of the

"disk" : {
          "disk_free" : 3278.83,
          "disk_total" : 4948.57,
          "read_bytes" : 5.0036226048E10,
          "read_count" : 197716.0,
          "read_time" : 8.7998397E7,
          "write_bytes" : 1.0003064832E10,
          "write_count" : 822311.0,
          "write_time" : 1.6088341E7

How should I interpret the read_time? Why the values take minutes to change (I am pulling
every 10 seconds) even if the host is under high disk I/O? Is there a legend that explains
the meaning of each one of the metrics?

Best Regards,

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