Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4491#issuecomment-74308722
HI @kellyzly ,
> I want ask a questions why org.apache.hadoop.mapreduce.MRJobConfig which
marked "InterfaceAudience.Private" can be imported in
org.apache.spark.deploy.yarn.Client.scala?
That's hadoop's way of saying "this class is `public` because
java-the-language requires it, but no one outside the hadoop project should be
using it".
So you can import it and use it in your code, but hadoop may change or even
delete it in the next version, and then your code will be broken.
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