Hope you are doing well
Learning hadoop is not required along side Apache spark. Though
basic knowledge of hdfs will be added advantage.Apart from this, you can
learn any NoSql database like MongoDb or Cassandra.
Also Machine Learning will be important if you are looking for data scientist profile. For Spark developer, you should be good in scala and spark concepts.
Hope this resolves your query
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edureka! Solution TeamWebsite - www.edureka.coEdureka claims 1st position at Deloitte's Technology Fast 50 India 2014