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https://issues.apache.org/jira/browse/SPARK-16121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15503278#comment-15503278
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Gaurav Shah commented on SPARK-16121:
-------------------------------------
Thanks [~srowen]
> ListingFileCatalog does not list in parallel anymore
> ----------------------------------------------------
>
> Key: SPARK-16121
> URL: https://issues.apache.org/jira/browse/SPARK-16121
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
> Priority: Blocker
> Fix For: 2.0.0
>
>
> In ListingFileCatalog, the implementation of {{listLeafFiles}} is shown
> below. When the number of user-provided paths is less than the value of
> {{sparkSession.sessionState.conf.parallelPartitionDiscoveryThreshold}}, we
> will not use parallel listing, which is different from what 1.6 does (for
> 1.6, if the number of children of any inner dir is larger than the threshold,
> we will use the parallel listing).
> {code}
> protected def listLeafFiles(paths: Seq[Path]):
> mutable.LinkedHashSet[FileStatus] = {
> if (paths.length >=
> sparkSession.sessionState.conf.parallelPartitionDiscoveryThreshold) {
> HadoopFsRelation.listLeafFilesInParallel(paths, hadoopConf,
> sparkSession)
> } else {
> // Dummy jobconf to get to the pathFilter defined in configuration
> val jobConf = new JobConf(hadoopConf, this.getClass)
> val pathFilter = FileInputFormat.getInputPathFilter(jobConf)
> val statuses: Seq[FileStatus] = paths.flatMap { path =>
> val fs = path.getFileSystem(hadoopConf)
> logInfo(s"Listing $path on driver")
> Try {
> HadoopFsRelation.listLeafFiles(fs, fs.getFileStatus(path),
> pathFilter)
> }.getOrElse(Array.empty[FileStatus])
> }
> mutable.LinkedHashSet(statuses: _*)
> }
> }
> {code}
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