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https://issues.apache.org/jira/browse/SPARK-9826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14682233#comment-14682233
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Apache Spark commented on SPARK-9826:
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User 'michellemay' has created a pull request for this issue:
https://github.com/apache/spark/pull/8109
> 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
>
> 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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