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https://issues.apache.org/jira/browse/SPARK-9826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcelo Vanzin updated SPARK-9826:
----------------------------------
    Target Version/s: 1.4.2, 1.5.0
              Labels: regression  (was: )

> Cannot use custom classes in log4j.properties
> ---------------------------------------------
>
>                 Key: SPARK-9826
>                 URL: https://issues.apache.org/jira/browse/SPARK-9826
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 1.4.1
>            Reporter: Michel Lemay
>            Priority: Minor
>              Labels: regression
>
> log4j is initialized before spark class loader is set on the thread context.
> Therefore it cannot use classes embedded in fat-jars submitted to spark.
> While parsing arguments, spark calls methods on Utils class and triggers 
> ShutdownHookManager static initialization.  This then leads to log4j being 
> initialized before spark gets the chance to specify custom class 
> MutableURLClassLoader on the thread context.
> See detailed explanation here:
> http://apache-spark-user-list.1001560.n3.nabble.com/log4j-custom-appender-ClassNotFoundException-with-spark-1-4-1-tt24159.html



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