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https://issues.apache.org/jira/browse/SPARK-16018?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15336326#comment-15336326
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Thomas Graves commented on SPARK-16018:
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Note we are seeing this on hadoop 2.7. I see hadoop 2.8 and > updated to 4.1.X
but either way we should shade it so we don't have conflicts.
> Shade netty for shuffle to work on YARN
> ---------------------------------------
>
> Key: SPARK-16018
> URL: https://issues.apache.org/jira/browse/SPARK-16018
> Project: Spark
> Issue Type: Bug
> Components: Shuffle
> Affects Versions: 2.0.0
> Reporter: Dhruve Ashar
> Priority: Blocker
> Fix For: 2.0.0
>
>
> We replaced LazyFileRegion with netty's DefaultFileRegion.
> Because of this (https://issues.apache.org/jira/browse/SPARK-15178), we have
> a dependency on netty 4.0.25.Final or >, but hadoop is on 4.0.23.Final, so
> the shuffle jar won't load in nodemanager as its trying to find a new version
> of the class.
> We need to shade netty's classes inorder to load the latest version we need
> and not depend on the one loaded by hadoop.
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