GitHub user JackYangzg opened a pull request:

    https://github.com/apache/spark/pull/18434

    [SPARK-21225] decrease the Mem using for variable 'tasks' in function 
resourceOffers

    JIRA Issue:https://issues.apache.org/jira/browse/SPARK-21225
    
    
    In the function 'resourceOffers', It declare a variable 'tasks' for storage 
the tasks which have allocated a executor. It declared like this:
    **val tasks = shuffledOffers.map(o => new 
ArrayBuffer[TaskDescription](o.cores))**
    
    But, I think this code only conside a situation for that one task per core. 
If the user set "spark.task.cpus" as 2 or 3, It really don't need so much Mem. 
I think It can motify as follow:
    
    **val tasks = shuffledOffers.map(o => new 
ArrayBuffer[TaskDescription](Math.ceil(o.cores*1.0/CPUS_PER_TASK).toInt))**
    


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/JackYangzg/spark motifyTaskCore

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/spark/pull/18434.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #18434
    
----
commit d1f58860e22fe08aa5d980c06e7fe0f2bc31c39b
Author: JackYangzg <[email protected]>
Date:   2017-06-07T07:07:30Z

    Merge pull request #1 from apache/master
    
    20170607 update to date

commit 713baecb8f17bb887ac0df46f0afab45bf0fd41d
Author: 杨治国10192065 <[email protected]>
Date:   2017-06-27T11:01:50Z

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branch 'master' of https://github.com/apache/spark

commit 05a54dd6effcf8a1003b159d57837fbbf915b3db
Author: 杨治国10192065 <[email protected]>
Date:   2017-06-27T11:07:14Z

    [SPARK-21225] decrease the Mem using for variable 'tasks' in function 
resourceOffers

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