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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13070) classloading isolation improvements for cleaner and stricter dependencies
Date Thu, 09 Jun 2016 18:23:21 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15323042#comment-15323042
] 

Steve Loughran commented on HADOOP-13070:
-----------------------------------------

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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