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https://issues.apache.org/jira/browse/SPARK-21171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-21171.
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Resolution: Invalid
> Speculate task scheduling block dirve handle normal task when a job task
> number more than one hundred thousand
> --------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-21171
> URL: https://issues.apache.org/jira/browse/SPARK-21171
> Project: Spark
> Issue Type: Improvement
> Components: Block Manager
> Affects Versions: 2.0.0
> Environment: We have more than two hundred high-performance machine
> to handle more than 2T data by one query
> Reporter: wangminfeng
>
> If a job have more then one hundred thousand tasks and spark.speculation is
> true, when speculable tasks start, choosing a speculable will waste lots of
> time and block other tasks. We do a ad-hoc query for data analyse, we can't
> tolerate one job wasting time even it is a large job
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