Which is the best online resource to learn SPARK and SCALA ?

As for Scala I can suggest you courses:
https://ru.coursera.org/course/progfun
https://ru.coursera.org/course/reactive

But I'm not aware about Spark materials.

Best regards,
Alexander Podkhalyuzin.

If you are looking to learn Spark and Scala then I will suggest you a good resources to excel its concepts:

http://www.scala-lang.org/documentation/
https://intellipaat.com/apache-spark-scala-training/
http://spark.apache.org/documentation.html

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Python for Apache Spark is pretty easy to learn and use. However, this not the only reason why Pyspark is a better choice than Scala. There's more. Python API for Spark may be slower on the cluster, but at the end, data scientists can do a lot more with it as compared to Scala. Many online resources available. DevOps Training

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