[GitHub] [spark] rrusso2007 commented on a change in pull request #24672: [SPARK-27801] Improve performance of InMemoryFileIndex.listLeafFiles for HDFS directories with many files

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rrusso2007 commented on a change in pull request #24672: [SPARK-27801] Improve performance of InMemoryFileIndex.listLeafFiles for HDFS directories with many files
URL: https://github.com/apache/spark/pull/24672#discussion_r287070995
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala
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 @@ -274,7 +275,21 @@ object InMemoryFileIndex extends Logging {
     // [SPARK-17599] Prevent InMemoryFileIndex from failing if path doesn't exist
     // Note that statuses only include FileStatus for the files and dirs directly under path,
     // and does not include anything else recursively.
-    val statuses = try fs.listStatus(path) catch {
+    val statuses: Array[FileStatus] = try {
+      fs match {
+        // DistributedFileSystem overrides listLocatedStatus to make 1 single call to namenode
+        // to retrieve the file status with the file block location. The reason to still fallback
+        // to listStatus is because the default implementation would potentially throw a
+        // FileNotFoundException which is better handled by doing the lookups manually below.
+        case _: DistributedFileSystem =>
+          val remoteIter = fs.listLocatedStatus(path)
+          new Iterator[LocatedFileStatus]() {
 
 Review comment:
   It's not a real iterator unfortunately its a RemoteIterator which which doesn't actually extend the Iterator interface.

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