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

    https://github.com/apache/spark/pull/17665#discussion_r112041944
  
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/security/ServiceCredentialProvider.scala
 ---
    @@ -15,7 +15,7 @@
      * limitations under the License.
      */
     
    -package org.apache.spark.deploy.yarn.security
    +package org.apache.spark.deploy.security
     
     import org.apache.hadoop.conf.Configuration
     import org.apache.hadoop.security.{Credentials, UserGroupInformation}
    --- End diff --
    
    Hmm... that's unfortunate, not just because of this change, but because 
`yarn/` is not included in mima checks, so if the class changed in incompatible 
ways we wouldn't notice.
    
    I really doubt anyone has custom implementations of that interface at this 
point. And making it a proper API in core is better going forward, IMO. If you 
really think that it's important to keep backwards compatibility, we could have 
the old interface present, extending the new one, and some compatibility code 
to keep both working. But that sounds like a lot of work for something I doubt 
anyone is currently using...


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