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" ... Impala is architected exactly like all of the shared-nothing parallel SQL DBMSs, serving the data warehouse market. Specifically, notice clearly that the MapReduce layer has been removed, and for good reason. As some of us have been pointing out for years, MapReduce is not a useful internal interface inside a SQL (or Hive) DBMS. Impala was architected by savvy DBMS developers, who know the above pragma. In fact, development activity similar to Impala is being done by both HortonWorks and FaceBook. This, of course, presents the Hadoop vendors with a dilemma. Historically, "Hadoop" referred to the open source version of MapReduce written by Yahoo. However, Impala has thrown this layer out of the stack. How can one be a Hadoop vendor, when Hadoop is no longer in the mainstream stack? The answer is simple: redefine "Hadoop", and that is exactly what the Hadoop vendors have done. The word "Hadoop" is now used to mean the entire stack. ... "