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https://issues.apache.org/jira/browse/SPARK-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Josh Rosen resolved SPARK-3140.
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Resolution: Fixed
Assignee: Andrew Or
> 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
> Assignee: Andrew Or
> Priority: Critical
> Fix For: 1.1.0
>
>
> 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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