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What is the most difficult concept to grasp in Bigdata Hadoop?

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Storage. With vast amounts of data generated daily, the greatest challenge is storage (especially when the data is in different formats) within legacy systems. Unstructured data cannot be stored in traditional databases
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My teaching experience 12 years

Storage. With vast amounts of data generated daily, the greatest challenge is storage (especially when the data is in different formats) within legacy systems. Unstructured data cannot be stored in traditional databases
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Online Mathematics tutor with 4 years experience(Online Classes for 10th to 12th)

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