Kostas's review feedback

Author: sryza

core/src/main/scala/org/apache/spark/rdd/HadoopRDD.scala

@@ -213,8 +213,6 @@ class HadoopRDD[K, V](
       logInfo("Input split: " + split.inputSplit)
       val jobConf = getJobConf()
 
-      // Instantiate input metrics before RecordReader, because RecordReader's constructor might
-      // read some bytes
       val inputMetrics = new InputMetrics(DataReadMethod.Hadoop)
       // Find a function that will return the FileSystem bytes read by this thread. Do this before
       // creating RecordReader, because RecordReader's constructor might read some bytes