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https://issues.apache.org/jira/browse/MAPREDUCE-1700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447996#comment-13447996
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Steve Loughran commented on MAPREDUCE-1700:
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Arun,
I see where Tom is coming from. Irrespective of how the Hadoop services are
deployed, you need to be able to do things like submit jobs from OSGi
containers (e.g Spring & others) which is what this patch appears to offer. And
if Oracle finally commit to OSGi now that Java 8 is being redefined, it'd be
good from all clients.
I would like to see a way to support this which doesn't put an OSGi JAR on the
classpath of everything.
Tom -is there a way to abstract away OSGi support so that it's optional, even
if its a subclass of JobSubmitter? An
{{org.apache.hadoop.mapreduce.osgi.OSGiJobSubmitter}} could override some new
specific protect methods to enable this.
> 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
> Assignee: 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.
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