How to get raw hadoop metrics

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sorry if this question is a duplicate, so far I haven't been able to find a satisfactory answer.

Is it possible to get the raw data of hadoop2 metrics? (e.g. in text file/json format)

According to https://wiki.apache.org/hadoop/GangliaMetrics, I know that I can use ganglia (or maybe nagios) to get the metrics and monitor hadoop cluster. However, what I want is the raw data, for my own analysis purpose.

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Ramzy On BEST ANSWER

Have you seen the following links link1 and link2. They clearly mentioned which metrics we can dump, and how to use sinks to store them