Quant analytics: Do big data use cases require the data to be stored? Hadoop? MapReduce?

Quant analytics: Do big data use cases require the data to be stored? Hadoop? MapReduce? Recently I checked out some Hadoop use cases like index building, text analytics, etc, and it seems that most of them don’t really want to save the data, only do the analysis, and then save the results – indexes, summary …

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