GitHub user djvulee opened a pull request:

    [SPARK-21383][Core] Fix the YarnAllocator allocates more Resource

    ## What changes were proposed in this pull request?
    When NodeManagers launching Executors,
    the `missing` value will excel the
    real value when the launch is slow, this can lead to YARN allocates more 
    We add the `numExecutorToBeLaunched` when calculate the `missing` to avoid 
    ## How was this patch tested?
    Test by experiment.

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

    $ git pull YarnAllocate

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

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

    This closes #18651
commit 818c9126959e8576861478e18389e6ed8fdbeac4
Author: DjvuLee <>
Date:   2017-07-17T07:54:09Z

    [Core] Fix the YarnAllocator allocate more Resource
    When NodeManagers launched the Executors, the missing will excel the
    real value, this can lead to YARN allocate more resource.


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