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On some websites (like in this PDF : http://sortbenchmark.org/Yahoo2009.pdf) I see very nice graphs that visualize what an Hadoop cluster is doing at what moment.
Were these made “manually” (i.e. with some homemade tool) or is there a “ready to run” script/tool that produces something like this for me?
Owen made the graph manually in Excel by gathering data from the logs, though I’ve heard Karamsphere’s tools will generate a similar graph.