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Data is replicated at least thrice on HDFS. Does it imply that any alterations or calculations done on one copy of the data will be reflected in the other two copies also?

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Calculations or any transformations are performed on the original data and do not get reflected to all the copies of data. Master node identifies where the original data is located and performs the calculations. Only if the node is not responding or data is corrupted then it will perform the desired calculations on the second replica.

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