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

    https://github.com/apache/flink/pull/4636#discussion_r137212206
  
    --- Diff: 
flink-scala/src/main/scala/org/apache/flink/api/scala/codegen/TypeInformationGen.scala
 ---
    @@ -320,14 +315,6 @@ private[flink] trait TypeInformationGen[C <: Context] {
         }
       }
     
    -  def mkWritableTypeInfo[T <: Writable : c.WeakTypeTag](
    --- End diff --
    
    Unfortunately, this means that users now have to manually specify a 
`TypeInformation` that they can get from 
`TypeExtractor.createHadoopWritableTypeInfo(MyWritable.class)`.
    
    I'm not sure how often people are using Hadoop Writables in their Scala 
code but this is definitely something that will break.


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