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https://issues.apache.org/jira/browse/SPARK-10721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857898#comment-15857898
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Sean Owen commented on SPARK-10721:
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I think that happens when it can't be deleted because it doesn't exist, or the
caller doesn't have permission, etc.
> Log warning when file deletion fails
> ------------------------------------
>
> Key: SPARK-10721
> URL: https://issues.apache.org/jira/browse/SPARK-10721
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Ted Yu
> Assignee: Ted Yu
> Priority: Minor
> Fix For: 1.6.0
>
>
> There're several places in the code base where return value from
> File.delete() is ignored.
> This issue adds checking for the boolean return value and logs warning when
> deletion fails.
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