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https://issues.apache.org/jira/browse/HIVE-9103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14290361#comment-14290361
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Chao commented on HIVE-9103:
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If task doesn't fail, backup task won't be triggered.
> Support backup task for join related optimization [Spark Branch]
> ----------------------------------------------------------------
>
> Key: HIVE-9103
> URL: https://issues.apache.org/jira/browse/HIVE-9103
> Project: Hive
> Issue Type: Sub-task
> Components: Spark
> Reporter: Xuefu Zhang
> Assignee: Chao
> Priority: Blocker
>
> In MR, backup task can be executed if the original task, which probably
> contains certain (join) optimization fails. This JIRA is to track this topic
> for Spark. We need to determine if we need this and implement if necessary.
> This is a followup of HIVE-9099.
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