srowen 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_r287064144
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InMemoryFileIndex.scala
##########
@@ -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:
Why do you need to wrap the iterator? Should be able to use JavaConversions
at worst to make it .asScala.toArray
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