Github user steveloughran commented on the issue:

    https://github.com/apache/spark/pull/20923
  
    @jerryshao the latest revision only has the POM changes, and that also 
excludes the build profile option to compile the hadoop-3 source trees
    
    It also switches the hadoop 3.1 version to being 3.1.0, which matches that 
of the current RC, and will be downloaded from the ASF staging repo  if the 
`snapshots-and-staging` profile is enabled
    
    For example
    
        mvn install -Phadoop-3,hadoop-cloud,yarn,snapshots-and-staging
    
    Remember that if you do download the staged artifacts, then if new RCs are 
cut then you will need to purge the RCs from `~/.m2/repository`



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