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https://issues.apache.org/jira/browse/SPARK-33739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17247497#comment-17247497
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Apache Spark commented on SPARK-33739:
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User 'steveloughran' has created a pull request for this issue:
https://github.com/apache/spark/pull/30714
> Jobs committed through the S3A Magic committer don't report the bytes written
> -----------------------------------------------------------------------------
>
> Key: SPARK-33739
> URL: https://issues.apache.org/jira/browse/SPARK-33739
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.1
> Reporter: Steve Loughran
> Priority: Minor
>
> The spark statistics tracking doesn't correctly assess the size of the
> uploaded files as it only calls getFileStatus on the zero byte objects -not
> the yet-to-manifest files. Which, given they don't exist yet, isn't easy to
> do.
> HADOOP-17414 will attach the final length as a custom header to the marker
> object, and implement getXAttr in the S3A FS to probe for it.
> BasicWriteStatsTracker can probe for this custom Xattr if the size of the
> generated file is 0 bytes; if found and parseable use that as the declared
> length of the output.
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