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https://issues.apache.org/jira/browse/SPARK-5134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14352317#comment-14352317
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Shivaram Venkataraman commented on SPARK-5134:
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Yeah so this did change in 1.2 and I think I mentioned it to Patrick when it
affected a couple of other projects of mine. The main problem there was that
even if you have an explicit Hadoop 1 dependency in your project, SBT picks up
the highest version required while building an assembly jar for the project --
Thus with Spark linked against Hadoop 2.2, one would require an exclusion rule
to use Hadoop 1. It might be good to add this to the docs or to some of the
example Quick Start documentation we have
> Bump default Hadoop version to 2+
> ---------------------------------
>
> Key: SPARK-5134
> URL: https://issues.apache.org/jira/browse/SPARK-5134
> Project: Spark
> Issue Type: Improvement
> Components: Build
> Affects Versions: 1.2.0
> Reporter: Ryan Williams
> Priority: Minor
>
> [~srowen] and I discussed bumping [the default hadoop version in the parent
> POM|https://github.com/apache/spark/blob/bb38ebb1abd26b57525d7d29703fd449e40cd6de/pom.xml#L122]
> from {{1.0.4}} to something more recent.
> There doesn't seem to be a good reason that it was set/kept at {{1.0.4}}.
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