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https://issues.apache.org/jira/browse/SPARK-12807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15130884#comment-15130884
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Marcelo Vanzin commented on SPARK-12807:
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- Guava is shaded in the final jar
- Netty is a different version (4.x for Spark vs. 3.x for Hadoop) which lives
in a different package, so fortunately no conflict
- leveldb was intentionally kept at the same version as Hadoop, exactly because
of the JNI bits
- the javax annotations are not used at runtime so there's no need to shade them
That leaves only Jackson; in hindsight it would have been better not to include
it in the shuffle service, but well, that's water under the bridge now. So that
leaves two solutions:
- park it at the same version as Hadoop; assuming different versions of Hadoop
use the same version...
- relocate it
Relocation is probably the safest choice given the many versions of Hadoop
people may be using.
> Spark External Shuffle not working in Hadoop clusters with Jackson 2.2.3
> ------------------------------------------------------------------------
>
> Key: SPARK-12807
> URL: https://issues.apache.org/jira/browse/SPARK-12807
> Project: Spark
> Issue Type: Bug
> Components: Shuffle, YARN
> Affects Versions: 1.6.0
> Environment: A Hadoop cluster with Jackson 2.2.3, spark running with
> dynamic allocation enabled
> Reporter: Steve Loughran
> Priority: Critical
>
> When you try to try to use dynamic allocation on a Hadoop 2.6-based cluster,
> you get to see a stack trace in the NM logs, indicating a jackson 2.x version
> mismatch.
> (reported on the spark dev list)
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