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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13398) prevent user classes from loading classes in the parent classpath with ApplicationClassLoader
Date Fri, 31 Mar 2017 17:12:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13398?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951309#comment-15951309
] 

Sangjin Lee commented on HADOOP-13398:
--------------------------------------

Ping. Any feedback on this patch is greatly appreciated. Thanks!

> prevent user classes from loading classes in the parent classpath with ApplicationClassLoader
> ---------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-13398
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13398
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: util
>            Reporter: Sangjin Lee
>            Assignee: Sangjin Lee
>            Priority: Critical
>         Attachments: HADOOP-13398-HADOOP-13070.01.patch, HADOOP-13398-HADOOP-13070.02.patch,
HADOOP-13398-HADOOP-13070.03.patch, HADOOP-13398-HADOOP-13070.04.patch, hadoop-13398-notes.pdf
>
>
> Today, a user class is able to trigger loading a class from Hadoop's dependencies, with
or without the use of {{ApplicationClassLoader}}, and it creates an implicit dependence from
users' code on Hadoop's dependencies, and as a result dependency conflicts.
> We should modify {{ApplicationClassLoader}} to prevent a user class from loading a class
from the parent classpath.
> This should also cover resource loading (including {{ClassLoader.getResources()}} and
as a corollary {{ServiceLoader}}).



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