[GitHub] [spark] yaooqinn commented on a change in pull request #34792: [SPARK-37530][Core] Spark reads many paths very slow though newAPIHadoopFile

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yaooqinn commented on a change in pull request #34792:
URL: https://github.com/apache/spark/pull/34792#discussion_r761744454



##########
File path: core/src/main/scala/org/apache/spark/rdd/NewHadoopRDD.scala
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@@ -123,6 +123,10 @@ class NewHadoopRDD[K, V](
 
   override def getPartitions: Array[Partition] = {
     val inputFormat = inputFormatClass.getConstructor().newInstance()
+    // setMinPartitions below will call FileInputFormat.listStatus(), which 
can be quite slow when
+    // traversing a large number of directories and files. Parallelize it.
+    _conf.setIfUnset(FileInputFormat.LIST_STATUS_NUM_THREADS,
+      Runtime.getRuntime.availableProcessors().toString)

Review comment:
       yes, 
https://github.com/apache/spark/blob/2d085c13b7f715dbff23dd1f81af45ff903d1a79/core/src/main/scala/org/apache/spark/rdd/WholeTextFileRDD.scala#L45-L46
   
   
https://github.com/apache/spark/blob/2d085c13b7f715dbff23dd1f81af45ff903d1a79/core/src/main/scala/org/apache/spark/rdd/BinaryFileRDD.scala#L42-L43




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