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https://issues.apache.org/jira/browse/HADOOP-13070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323042#comment-15323042
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Steve Loughran commented on HADOOP-13070:
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custom classloaders tend to cause problems downstream, both maintenance and
use. That doesn't mean they don't solve some problems: it's just they are dogs
to work with. Little dogs that seem like cute little puppies, which eventually
become big ugly beasts you have to take for 3 h walks every day, eats
everything in the kitchen, uses your bed as a toilet and, due to its habit of
biting small children, is something you are scared of yourself.
> classloading isolation improvements for cleaner and stricter dependencies
> -------------------------------------------------------------------------
>
> Key: HADOOP-13070
> URL: https://issues.apache.org/jira/browse/HADOOP-13070
> Project: Hadoop Common
> Issue Type: Improvement
> Components: util
> Reporter: Sangjin Lee
> Assignee: Sangjin Lee
> Priority: Critical
> Attachments: classloading-improvements-ideas-v.3.pdf,
> classloading-improvements-ideas.pdf, classloading-improvements-ideas.v.2.pdf
>
>
> Related to HADOOP-11656, we would like to make a number of improvements in
> terms of classloading isolation so that user-code can run safely without
> worrying about dependency collisions with the Hadoop dependencies.
> By the same token, it should raised the quality of the user code and its
> specified classpath so that users get clear signals if they specify incorrect
> classpaths.
> This will contain a proposal that will include several improvements some of
> which may not be backward compatible. As such, it should be targeted to the
> next major revision of Hadoop.
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