Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/13718#discussion_r67972453 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/FileStreamSource.scala --- @@ -120,7 +120,13 @@ class FileStreamSource( val catalog = new ListingFileCatalog(sparkSession, globbedPaths, options, Some(new StructType)) val files = catalog.allFiles().map(_.getPath.toUri.toString) val endTime = System.nanoTime - logInfo(s"Listed ${files.size} in ${(endTime.toDouble - startTime) / 1000000}ms") + val listingTimeMs = (endTime.toDouble - startTime) / 1000000 + if (listingTimeMs > 2000) { + // Output a warning when listing files uses more than 2 seconds. + logWarning(s"Listed ${files.size} file(s) in $listingTimeMs ms") --- End diff -- > Should some kind of metric be introduced so that the user doesn't need to examine logs ? Sounds great. But that's not the priority task right now.
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