Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11796#discussion_r58104995
  
    --- Diff: dev/run-tests.py ---
    @@ -571,8 +572,8 @@ def main():
         # backwards compatibility checks
         if build_tool == "sbt":
             # Note: compatibility tests only supported in sbt for now
    -        detect_binary_inop_with_mima()
    -        # Since we did not build assembly/assembly before running 
dev/mima, we need to
    +        detect_binary_inop_with_mima(hadoop_version)
    +        # Since we did not build assembly/package before running dev/mima, 
we need to
             # do it here because the tests still rely on it; see SPARK-13294 
for details.
             build_spark_assembly_sbt(hadoop_version)
    --- End diff --
    
    I'm not sure about how these two really interact; I noticed that 
`detect_binary_inop_with_mima` would, directly or indirectly, end up running 
the `package` target for the build. Also note there are still some assemblies 
that are built, for streaming connectors.
    
    Overall, because of SPARK-9284, we could potentially change all this to run 
everything in one step (build, tests and potentially even mima checks), 
although that could potentially make error messages less clear. I'd rather look 
at that separately though.


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