Github user steveloughran commented on a diff in the pull request:
https://github.com/apache/spark/pull/14371#discussion_r74684971
--- Diff:
streaming/src/main/scala/org/apache/spark/streaming/util/FileBasedWriteAheadLog.scala
---
@@ -231,13 +232,17 @@ private[streaming] class FileBasedWriteAheadLog(
val logDirectoryPath = new Path(logDirectory)
val fileSystem = HdfsUtils.getFileSystemForPath(logDirectoryPath,
hadoopConf)
- if (fileSystem.exists(logDirectoryPath) &&
- fileSystem.getFileStatus(logDirectoryPath).isDirectory) {
- val logFileInfo =
logFilesTologInfo(fileSystem.listStatus(logDirectoryPath).map { _.getPath })
- pastLogs.clear()
- pastLogs ++= logFileInfo
- logInfo(s"Recovered ${logFileInfo.size} write ahead log files from
$logDirectory")
- logDebug(s"Recovered files
are:\n${logFileInfo.map(_.path).mkString("\n")}")
+ try {
+ if (fileSystem.getFileStatus(logDirectoryPath).isDirectory) {
--- End diff --
If you call `listStatus(file)` it returns a stat of the file, rather than
listing of the children. Irritating as it's hard to differentiate
listStatus(file) and listStatus(dir-with-one-child) except by examining the
name of the returned status, and once you've got symlinks in the mix that
differentiation isn't easy (The standard FileSystem globber has to jump though
these hoops, hoops a dedicated s3a globber can/will avoid)
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