User supplied dependencies may conflict with MapReduce system JARs
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Key: MAPREDUCE-1700
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1700
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: task
Reporter: Tom White
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.
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