A few years ago, we remembered the time when it was just impossible to analyze petabytes of data. The emergence of Hadoop made it possible to run analytical queries on our vast amount of historical data.
As we know, Big Data is a buzz from the last few years, but Modern Data Pipelines are always receiving data at a high ingestion rate. So this constant flow of data at high velocity is termed as Fast Data.

So Fast data is not about just volume of data like Data Warehouses in which data is measured in GigaBytes, TeraBytes or PetaBytes. Instead, we measure volume but concerning its incoming rate like MB per second, GB per hour, TB per day. So Volume and Velocity both are considered while talking about Fast Data.

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