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https://issues.apache.org/jira/browse/SPARK-29302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17086117#comment-17086117
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Mridul Muralidharan commented on SPARK-29302:
---------------------------------------------

Drive by observations:

* Speculative execution does not run the speculative task concurrently on the 
same node running the task (so definitely not same executor).
* Do we have additional details about the tasks which are failing ? Did they 
fail before (for unrelated reasons) before failing for path conflict ?


> dynamic partition overwrite with speculation enabled
> ----------------------------------------------------
>
>                 Key: SPARK-29302
>                 URL: https://issues.apache.org/jira/browse/SPARK-29302
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.4.4
>            Reporter: feiwang
>            Priority: Major
>         Attachments: screenshot-1.png, screenshot-2.png
>
>
> Now, for a dynamic partition overwrite operation,  the filename of a task 
> output is determinable.
> So, if speculation is enabled,  would a task conflict with  its relative 
> speculation task?
> Would the two tasks concurrent write a same file?



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