Apache Spark commented on SPARK-18679:

User 'ericl' has created a pull request for this issue:

> Regression in file listing performance
> --------------------------------------
>                 Key: SPARK-18679
>                 URL: https://issues.apache.org/jira/browse/SPARK-18679
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.1.0
>            Reporter: Eric Liang
>            Priority: Blocker
> In Spark 2.1 ListingFileCatalog was significantly refactored (and renamed to 
> InMemoryFileIndex).
> It seems there is a performance regression here where we no longer 
> performance listing in parallel for the non-root directory. This forces file 
> listing to be completely serial when resolving datasource tables that are not 
> backed by an external catalog.

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