Github user witgo commented on the pull request:

    https://github.com/apache/spark/pull/1983#issuecomment-55223673
  
    @allwefantasy  Spark是可以调整executor同时运行的task数量的. 
       如果你想让每个executor同时可以运行17个task. 
可以在`conf/spark-defaults.conf` 文件添加如下配置
    
         spark.executor.cores 17


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