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https://issues.apache.org/jira/browse/SPARK-32170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17151288#comment-17151288
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Apache Spark commented on SPARK-32170:
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User 'weixiuli' has created a pull request for this issue:
https://github.com/apache/spark/pull/28994
> Improve the speculation for the inefficient tasks by the task metrics.
> -----------------------------------------------------------------------
>
> Key: SPARK-32170
> URL: https://issues.apache.org/jira/browse/SPARK-32170
> Project: Spark
> Issue Type: Improvement
> Components: Scheduler, Spark Core
> Affects Versions: 3.0.0
> Reporter: weixiuli
> Priority: Major
> Fix For: 3.0.0
>
>
> 1) Tasks will be speculated when meet certain conditions no matter they are
> inefficient or not，this would be a huge waste of cluster resources.
> 2) In production，the speculation task comes from an efficient one will be
> killed finally，which is unnecessary and will waste of cluster resources.
> 3) So, we should evaluate whether the task is inefficient by success tasks
> metrics firstly, and then decide to speculate it or not. The inefficient
> task will be speculated and efficient one will not, it is better for the
> cluster resources.
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