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https://issues.apache.org/jira/browse/SPARK-11194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14964113#comment-14964113
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Apache Spark commented on SPARK-11194:
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User 'yhuai' has created a pull request for this issue:
https://github.com/apache/spark/pull/9170
> Use a single URLClassLoader for jars added through SQL's "ADD JAR" command
> --------------------------------------------------------------------------
>
> Key: SPARK-11194
> URL: https://issues.apache.org/jira/browse/SPARK-11194
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Yin Huai
> Assignee: Yin Huai
>
> Right now, we stack a new URLClassLoader when a user add a jar through SQL's
> add jar command. This approach can introduce issues caused by the ordering of
> added jars when a class of a jar depends on another class of another jar.
> For example,
> {code}
> ClassLoader1 for Jar1.jar (A.class)
> |
> |----- ClassLoader2 for Jar2.jar (B.class depending on A.class)
> {code}
> In this case, when we lookup class B, we will not be able to find class A
> because Jar2 is the parent of Jar1.
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