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https://issues.apache.org/jira/browse/SPARK-29037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928165#comment-16928165
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feiwang commented on SPARK-29037:
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This is the unit test log.
!screenshot-1.png!
We can see that, the task's output will always be saved at
$tablePath/_temporary/0/.
> [Core] Spark gives duplicate result when an application was killed and rerun
> ----------------------------------------------------------------------------
>
> Key: SPARK-29037
> URL: https://issues.apache.org/jira/browse/SPARK-29037
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 2.1.0
> Reporter: feiwang
> Priority: Major
> Attachments: screenshot-1.png
>
>
> When we insert overwrite a partition of table.
> For a stage, whose tasks commit output, a task saves output to a staging dir
> firstly, when all tasks of this stage success, all task output under staging
> dir will be moved to destination dir.
> However, when we kill an application, which is committing tasks' output,
> parts of tasks' results will be kept in staging dir, which would not be
> cleared gracefully.
> Then we rerun this application and the new application will reuse this
> staging dir.
> And when the task commit stage of new application success, all task output
> under this staging dir, which contains parts of old application's task output
> , would be moved to destination dir and the result is duplicated.
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