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https://issues.apache.org/jira/browse/SPARK-50417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SPARK-50417:
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Labels: pull-request-available (was: )
> Limit number of subdirectories that FallbackStorage creates per shuffle
> -----------------------------------------------------------------------
>
> Key: SPARK-50417
> URL: https://issues.apache.org/jira/browse/SPARK-50417
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 4.0.0
> Reporter: Enrico Minack
> Priority: Major
> Labels: pull-request-available
>
> The {{FallbackStorage}} copies shuffle data during executor decommissioning
> to a distributed or cloud storage like S3 or HDFS. In
> https://github.com/apache/spark/pull/34762, a hash has been added to the path
> of a file in order to reduce the number of files per directory (prefix in S3
> terms). This creates as many directories per shuffle as files are
> transferred, while each directory contains a single file.
> While this might be useful for S3, it may pose challenges for other
> filesystems. A shuffle of 100,000 partitions creates 100,000 directories,
> each containing a single file. The number of directories should be
> configurable to be able to adjust this behavior for the specific filesystem
> used.
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