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Why not use something like MapReduce?

We can refer to systems like MapReduce as distributed computing systems in which the reduce operation is based on distributed sorting. The most common open-source solution in this class is Apache Hadoop.
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What is OLAP?

OLAP stands for Online Analytical Processing. It is a broad term that can be looked at from two perspectives: technical and business.
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Who is using ClickHouse?

Being an open-source product makes this question not so straightforward to answer. You do not have to tell anyone if you want to start using ClickHouse, you just go grab source code or pre-compiled packages.
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