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Hadoop Clusters and node setup in Real office environment

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@ssvbalan wrote:

Hi... Recently completed Big data certification on Hadoop, Mapreduce......

But still have a clarity on how a distributed system works in real time?

Majorly Data & Name node, Job & Task Tracker...(how these Four roles played with physical storage)

For example :
Job tracker and name node in different system or same system?
Ideal cluster numbers and how many systems in a cluster?
Size of those systems(Harddisk,RAM)...

It wud be grateful if anyone give input on this to realize the distirbuted system in real time....

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