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https://issues.apache.org/jira/browse/SPARK-32149?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim resolved SPARK-32149.
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Fix Version/s: 3.1.0
Resolution: Fixed
Issue resolved by pull request 28967
[https://github.com/apache/spark/pull/28967]
> Improve file path name normalisation at block resolution within the external
> shuffle service
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-32149
> URL: https://issues.apache.org/jira/browse/SPARK-32149
> Project: Spark
> Issue Type: Improvement
> Components: Shuffle
> Affects Versions: 3.1.0
> Reporter: Attila Zsolt Piros
> Assignee: Attila Zsolt Piros
> Priority: Major
> Fix For: 3.1.0
>
>
> In the external shuffle service during the block resolution the file paths
> (for disk persisted RDD and for shuffle blocks) are normalized by a custom
> Spark code which uses an OS dependent regexp. This is a redundant code of the
> package-private JDK counterpart.
> As the code not a perfect match even it could happen one method results in a
> bit different (but semantically equal) path.
> The reason of this redundant transformation is the interning of the
> normalized path to save some heap here which is only possible if both results
> in the same string.
> Checking the JDK code I believe there is a better solution which is perfect
> match for the JDK code as it uses that package private method. Moreover based
> on some benchmarking even this new method seams to be more performant too.
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