This survey presents the concept of Big Data. Firstly, a definition and the features of Big Data
are given. Secondly, the different steps for Big Data data processing and the main problems
encountered in big data management are described. Next, a general overview of an architecture
for handling it is depicted. Then, the problem of merging Big Data architecture in an
already existing information system is discussed. Finally this survey tackles semantics (reasoning,
coreference resolution, entity linking, information extraction, consolidation, paraphrase
resolution, ontology alignment) in the Big Data context.