How to show top N number of results with customization in spark rdd?

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val sorting = sc.parallelize(List(1,1,1,2,2,2,2,3,3,3,4,4,4,4,5,5,5,6,6,7,8,8,8,8,8))
sorting.map(x=>(x,1)).reduceByKey((a,b)=>a+b).map(x=>(x._1,"==>


                      
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