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https://issues.apache.org/jira/browse/SPARK-18679?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-18679.
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Resolution: Fixed
Assignee: Eric Liang
Fix Version/s: 2.1.0
> Regression in file listing performance
> --------------------------------------
>
> Key: SPARK-18679
> URL: https://issues.apache.org/jira/browse/SPARK-18679
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Eric Liang
> Assignee: Eric Liang
> Priority: Blocker
> Fix For: 2.1.0
>
>
> 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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