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In 2015, Hadoop no longer means MapReduce on HDFS. Instead, it refers to a whole ecosystem of technologies for working with “unstructured,” semi-structured, and structured data for complex processing at scale.

This also now includes streaming use cases, which can be massively parallelized or happen in “real time” (which today means many different things ... other than traditional RTOS-style “real time”). The streaming Spark crowd now likes to contrasts itself from the Hadoop -- or more specifically, the YARN -- crowd.

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