The biggest thing you need to know about #Hadoop is that it isn’t Hadoop anymore.
Between #Cloudera sometimes swapping out HDFS for Kudu while declaring #Spark the center of its universe (thus replacing #MapReduce everywhere it is found) and Hortonworks joining the Spark party, the only item you can be sure of in a “Hadoop” cluster is YARN. Oh, but Databricks, aka the Spark people, prefer Mesos over YARN -- and by the way, Spark doesn’t require HDFS.
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