[jira] [Resolved] (SPARK-21171) Speculate task scheduling block dirve handle normal task when a job task number more than one hundred thousand

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-21171?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen resolved SPARK-21171.
-------------------------------
    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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