Using Scala 2.12 with Spark 2.x

scala apache-spark abi binary-compatibility
NetanelRabinowitz picture NetanelRabinowitz · Mar 19, 2017 · Viewed 15.2k times · Source

At the Spark 2.1 docs it's mentioned that

Spark runs on Java 7+, Python 2.6+/3.4+ and R 3.1+. For the Scala API, Spark 2.1.0 uses Scala 2.11. You will need to use a compatible Scala version (2.11.x).

at the Scala 2.12 release news it's also mentioned that:

Although Scala 2.11 and 2.12 are mostly source compatible to facilitate cross-building, they are not binary compatible. This allows us to keep improving the Scala compiler and standard library.

But when I build an uber jar (using Scala 2.12) and run it on Spark 2.1. every thing work just fine.

and I know its not any official source but at the 47 degree blog they mentioned that Spark 2.1 does support Scala 2.12.

How can one explain those (conflicts?) pieces of information ?

Answer

user7735456 picture user7735456 · Mar 19, 2017

Spark does not support Scala 2.12. You can follow SPARK-14220 (Build and test Spark against Scala 2.12) to get up to date status.

update: Spark 2.4 added an experimental Scala 2.12 support.

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