Posted by: Ruben123 December 2, 2015
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1. You can start with reading the hadoop architecture, I would recommend getting Hadoop - The Definitive Guide - 4th Edition, Hadoop In Practice 2nd Edition.

2. Download QuickStart VM from either from Hortonworks or Cloudera.

3. The authors who published these books have source code in github which you can clone to your VM and practice some mapreduce, create jobs & understand basics of Pig, Hive, HBase, etc.

4. I guess coming from admin background you can setup your own distributed cluster with hadoop and learn about bigtop, vmware, virtualbox, vagrant, etc
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