Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9490#discussion_r44516708
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/sources/interfaces.scala ---
@@ -431,7 +436,7 @@ abstract class HadoopFsRelation
private[sql](maybePartitionSpec: Option[Partitio
val hdfsPath = new Path(path)
val fs = hdfsPath.getFileSystem(hadoopConf)
val qualified = hdfsPath.makeQualified(fs.getUri,
fs.getWorkingDirectory)
-
+ inputExists = inputExists && fs.exists(qualified)
--- End diff --
This can be quite expensive since each `fs.exists(qualified)` call invokes
`FileSystem.getFileStatus()`, which is an RPC call. On the other hand, we've
already called `fs.listStatus(qualified)` below. Would be better to merge these
two.
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