Github user cloud-fan commented on the issue:

    https://github.com/apache/spark/pull/22977
  
    I think one major issue is, there is no document about how to update mima 
with new releases. Anyone knows the detailed process? Seems we need to update 
`MimaExcludes.scala` with something like `lazy val v30excludes = v24excludes ++ 
Seq` when cut the new branch, and update `MimaBuild.scala` when the new release 
is published.
    
    And there are 2 remaining issues.
    1. the data source v2 changes broke a lot of mima rules, while I expect 
interfaces marked as "Envolving" should not be tracked by mima.
    2. mllib broke a lot of mima rules, seems caused by 
https://github.com/apache/spark/pull/22921 . @srowen  can you take a look?
    
    Also cc @JoshRosen @gatorsmile @shaneknapp @vanzin @holdenk @felixcheung 


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