怎么成为Apache Spark贡献者

You should start with:

Read API Docs: Spark 2.4.3 Scala Doc
Join the mailing list: Community | Apache Spark
Now you should take a look at Jira (list of known bugs / issues): - ASF JIRA

Jira

首先要到Spark 的 Jira里找找有没有什么自己可以解决的Issue。