Andrew Or created SPARK-4215:
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             Summary: Allow requesting executors only on Yarn (for now)
                 Key: SPARK-4215
                 URL: https://issues.apache.org/jira/browse/SPARK-4215
             Project: Spark
          Issue Type: Bug
          Components: Spark Core, YARN
    Affects Versions: 1.2.0
            Reporter: Andrew Or
            Assignee: Andrew Or
            Priority: Critical


Currently if the user attempts to call `sc.requestExecutors` on, say, 
standalone mode, it just fails silently. We must at the very least log a 
warning to say it's only available for Yarn currently, or maybe even throw an 
exception.



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