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comment Raspberry Pi based Hadoop cluster
Hadoop can work in 3 different configurations. They are single node (only few most important services are started), pseudocluster (all Hadoop services are executed at the same node), cluster (distributed configuration). It's quite ok to learn Apache Hadoop having only 1-2 nodes. It will work, but using more mature configuration you may catch some new unexpected bugs. Personally I have 2 nodes: desktop and notebook, 10 cores in sum that is quite enough for me. At any rate everything depends on your needs.
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comment Raspberry Pi based Hadoop cluster
Thank you very much for your response. I understood that it's incredibly bad idea.
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