hadoop-mapreduce-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Tom White (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-1700) User supplied dependencies may conflict with MapReduce system JARs
Date Tue, 04 Sep 2012 14:39:09 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-1700?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tom White updated MAPREDUCE-1700:

    Attachment: MAPREDUCE-1700.patch

New patch with a unit test. The test isn't integrated into the build yet, so you have to build
the class-isolation-example module manually first. I've also removed the fictitious libs and
instead used Guava as an example of an incompatibility.
> User supplied dependencies may conflict with MapReduce system JARs
> ------------------------------------------------------------------
>                 Key: MAPREDUCE-1700
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1700
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>            Reporter: Tom White
>         Attachments: MAPREDUCE-1700.patch, MAPREDUCE-1700.patch
> If user code has a dependency on a version of a JAR that is different to the one that
happens to be used by Hadoop, then it may not work correctly. This happened with user code
using a different version of Avro, as reported [here|https://issues.apache.org/jira/browse/AVRO-493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12852081#action_12852081].
> The problem is analogous to the one that application servers have with WAR loading. Using
a specialized classloader in the Child JVM is probably the way to solve this.

This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

View raw message