Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/95#issuecomment-36936894
@yaoshengzhe this supports "yarn-standalone" for backwards compatibility so
you don't need to change your application. The name "yarn-standalone" is really
confusing because the other resource manager is called "standalone mode" and
it's different than YARN. This is a big enough issue that it warrants changing
before the 1.0 release, especially given that we support the old name.
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