[jira] [Created] (SPARK-3140) PySpark start-up throws confusing exception

["Andrew Or (JIRA)" <ji...@apache.org>]

Andrew Or created SPARK-3140:
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             Summary: PySpark start-up throws confusing exception
                 Key: SPARK-3140
                 URL: https://issues.apache.org/jira/browse/SPARK-3140
             Project: Spark
          Issue Type: Bug
          Components: PySpark
    Affects Versions: 1.0.2
            Reporter: Andrew Or
            Priority: Critical


Currently we read the pyspark port through stdout of the spark-submit subprocess. However, if there is stdout interference, e.g. spark-submit echoes something unexpected to stdout, we print the following:

{code}
Exception: Launching GatewayServer failed! (Warning: unexpected output detected.)
{code}

This condition is fine. However, we actually throw the same exception if there is *no* output from the subprocess as well. This is very confusing because it implies that the subprocess is outputting something (possibly whitespace, which is not visible) when it's actually not.



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