Nifi is not the best tool to do table joins. It will be able to do some transformations, but the heavy lifting should be done with spark or storm (if real time is needed). Have a look at this thread: https://community.hortonworks.com/questions/64667/joining-tables-within-nifi.html ... View more

Mainly it's because of performance reasons. Have a read through this: https://community.hortonworks.com/questions/27567/write-performance-in-hdfs.html#answer-27633 ... View more

If you are beginner and want to start with ML, I'd suggest ditching Mahout and better learn Spark. Mahout is older project, which uses MapReduce. Spark on the other hand is in memory processing, and way more developed. There's literally no one that uses Mahout... everyone is focusing on Spark: https://hortonworks.com/apache/spark/ Check out some nice Spark tutorials we have: https://hortonworks.com/tutorial/hands-on-tour-of-apache-spark-in-5-minutes/ https://hortonworks.com/hadoop-tutorial/interacting-with-data-on-hdp-using-scala-and-apache-spark/ ... View more

@Luca Molinari I ran: #sudo rpm -Uvh http://dev.mysql.com/get/mysql-community-release-el7-5.noarch.rpm and it passed... ... View more