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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2016/06/21 23:59:57 UTC
[jira] [Commented] (SPARK-16121) ListingFileCatalog does not list
in parallel anymore
[ https://issues.apache.org/jira/browse/SPARK-16121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15343069#comment-15343069 ]
Apache Spark commented on SPARK-16121:
--------------------------------------
User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/13830
> 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
> Priority: Blocker
>
> 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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