Answer:
A person struck in a jam would not wait for days to get information about the latest traffic situation so that he can take the shortest clear route home. He will need the information instantly. Here is the role of Velocity in big data. The huge data needs to be processed very fast and the analysis needs to be completed quickly, that’s the need of the hour. Currently these technologies are helping to keep things fast for big data, streaming data or complex event processing and in-memory processing. There are several proprietary and open source tools for this. Examples include MapReduce, S4, and Storm etc. There is also another factor which we should keep in mind, information retrieval here technologies like NoSQL helps, which are optimized for the fast retrieval of pre-computed information
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