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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13070) classloading isolation improvements for cleaner and stricter dependencies
Date Fri, 29 Apr 2016 17:44:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13070?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15264412#comment-15264412
] 

Sangjin Lee commented on HADOOP-13070:
--------------------------------------

Hi [~stevel@apache.org], I'm not quite sure what you meant by flipping the maven switch. Could
you kindly elaborate?

This is a companion to HADOOP-11656, but this addresses more of a container-like situation
(e.g. isolating user code in MR tasks, etc.). There are some long-standing improvements we
can make that will make everyone's life easier but which may break some backward compatibility.
I'm thinking of changing some APIs and replacing configs, etc.

I'm not sure if this should target Hadoop 3 (I'm not entirely clear where we stand with Hadoop
3 at the moment). My hope is it would be in the first release where breaking backward compatibility
is allowed.

> 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
>
> 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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