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

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

     [ https://issues.apache.org/jira/browse/SPARK-3140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Or updated SPARK-3140:
-----------------------------

    Fix Version/s: 1.1.0

> 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
>             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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