Patrick Wendell created SPARK-8933:
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             Summary: Provide a --force flag to build/mvn that always uses 
downloaded maven
                 Key: SPARK-8933
                 URL: https://issues.apache.org/jira/browse/SPARK-8933
             Project: Spark
          Issue Type: Improvement
          Components: Build
            Reporter: Patrick Wendell
            Assignee: Brennon York


I noticed the other day that build/mvn will still use the system maven if "mvn" 
binary is installed. I think this was intentional to support just using zinc 
and using the system maven (and to match the semantics of sbt/sbt). It would be 
nice to have a flag that will force it to use the downloaded maven. I was 
thinking it could have a --force flag, and then it could swallow that flag and 
not pass it onto maven.

This is useful in some cases like our test runners, where we want to coerce a 
specific version of maven is used.



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