GitHub user WangTaoTheTonic opened a pull request:

    https://github.com/apache/spark/pull/3557

    [SPARK-4697]System properties should override environment variables

    I found some arguments in yarn module take environment variables before 
system properties while the latter override the former in core module.

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

    $ git pull https://github.com/WangTaoTheTonic/spark SPARK4697

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

    https://github.com/apache/spark/pull/3557.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 #3557
    
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commit 5f43f453df19c1b281aa0a0e74d06b543a6e2d95
Author: WangTao <barneystin...@aliyun.com>
Date:   2014-12-02T15:02:21Z

    System property can override environment variable

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