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https://issues.apache.org/jira/browse/SPARK-17875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017001#comment-16017001
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Morten Hornbech commented on SPARK-17875:
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We were just hit by a runtime error caused by this apparently obsolete
dependency. More specifically the version of SslHandler used by netty 3.8 is
not binary compatible with the one we use (and the one spark-core uses in netty
4.0).
We can get around this by shading our own dependency, but I think its a bit
nasty having this floating around risking unnecessary runtime errors -
dependency management is difficult enough as it is :-) Could we reopen the
issue?
> Remove unneeded direct dependence on Netty 3.x
> ----------------------------------------------
>
> Key: SPARK-17875
> URL: https://issues.apache.org/jira/browse/SPARK-17875
> Project: Spark
> Issue Type: Improvement
> Components: Build
> Affects Versions: 2.0.1
> Reporter: Sean Owen
> Assignee: Sean Owen
> Priority: Trivial
>
> The Spark build declares a dependency on Netty 3.x and 4.x, but only 4.x is
> used. It's best to remove the 3.x dependency (and while we're at it, update a
> few things like license info)
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