GitHub user dhruve opened a pull request:

    https://github.com/apache/spark/pull/15152

    [SPARK-17365][Core] Remove/Kill multiple executors together to reduce RPC 
call time.

    ## What changes were proposed in this pull request?
    We are killing multiple executors together instead of iterating over 
expensive RPC calls to kill single executor.
    
    
    ## How was this patch tested?
    Executed sample spark job to observe executors being killed/removed with 
dynamic allocation enabled.

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

    $ git pull https://github.com/dhruve/spark impr/SPARK-17365

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

    https://github.com/apache/spark/pull/15152.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 #15152
    
----
commit 5a185d21b03f8e328388ad3ae9cf433c5588f956
Author: Dhruve Ashar <dhruveas...@gmail.com>
Date:   2016-09-01T20:19:08Z

    [SPARK-17365][Core] Remove/Kill multiple executors together to reduce 
contention
    
    [SPARK-17365][Core] Return executorIds which are actually killed while 
killing multiple executors
    
    Fix import wrap and remove unused import
    
    Add mima exclude and refactor few methods.

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