Hi, I reported this issue (https://issues.apache.org/jira/browse/SPARK-3794) about compilation error of spark core. This error depends on a Hadoop version, and problematic versions are 1.1.1--2.2.0.
At first, we should argue about what versions of Hadoop Spark supports. If we decide to omit a support for those versions, things are so simple and no modification is needed. Otherwise, we should be careful to use only commons-io 2.1. Regards, cocoatomo -- class Cocoatomo: name = 'cocoatomo' email_address = 'cocoatom...@gmail.com' twitter_id = '@cocoatomo'