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https://issues.apache.org/jira/browse/SPARK-21506?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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liuxian updated SPARK-21506:
----------------------------
    Description: 
The description for "spark.executor.cores" :"The number of cores assigned to 
each executor is configurable. When this is not explicitly set, only one 
executor per application will run the same worker "
I think it is not correct, because if  one  application is not assigned enough 
cores in the first `schedule()`, another executor may be launched on the same 
worker in the next time.


  was:
This description for "spark.executor.cores" :"The number of cores assigned to 
each executor is configurable. When this is not explicitly set, only one 
executor per application will run the same worker "
I think it is not correct, because if  one  application is not assigned enough 
cores in the first `schedule()`, another executor may be launched on the same 
worker in the next time.



> The description of "spark.executor.cores" may be not  correct
> -------------------------------------------------------------
>
>                 Key: SPARK-21506
>                 URL: https://issues.apache.org/jira/browse/SPARK-21506
>             Project: Spark
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 2.3.0
>            Reporter: liuxian
>
> The description for "spark.executor.cores" :"The number of cores assigned to 
> each executor is configurable. When this is not explicitly set, only one 
> executor per application will run the same worker "
> I think it is not correct, because if  one  application is not assigned 
> enough cores in the first `schedule()`, another executor may be launched on 
> the same worker in the next time.



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