Github user pwendell commented on a diff in the pull request: https://github.com/apache/spark/pull/94#discussion_r10364651 --- Diff: core/src/main/scala/org/apache/spark/rdd/PipedRDD.scala --- @@ -59,6 +61,20 @@ class PipedRDD[T: ClassTag]( val currentEnvVars = pb.environment() envVars.foreach { case (variable, value) => currentEnvVars.put(variable, value) } + // for compatibility with Hadoop which sets these env variables + // so the user code can access the input filename + if (split.isInstanceOf[HadoopPartition]) { + val hadoopSplit = split.asInstanceOf[HadoopPartition] + + if (hadoopSplit.inputSplit.value.isInstanceOf[FileSplit]) { + val is: FileSplit = hadoopSplit.inputSplit.value.asInstanceOf[FileSplit] + // map.input.file is deprecated in favor of mapreduce.map.input.file but set both --- End diff -- tiny nit: but mind saying `map_input_file` etc here (using underscores and not periods). Otherwise it's sorta confusing because it looks like these are hadoop conf options.
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