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MapReduce, mail # user - How to understand DataNode usages ?

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How to understand DataNode usages ?
Dhanasekaran Anbalagan 2013-02-14, 09:12
Hi Guys,

In Datanode UI page they give Datanode usage. what does actually mean,
Please guide me Min, Median, stdev
DataNodes usages:Min %Median %Max %stdev %
                             22.15 %24.33 %58.09 %15.4 %

Did I learn something today? If not, I wasted it.