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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