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https://issues.apache.org/jira/browse/HADOOP-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16139454#comment-16139454
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Vinod Kumar Vavilapalli commented on HADOOP-14284:
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bq. Essentially, if we're not shading the server-side for YARN / MapReduce then
we ought not. For client-side stuff we should just tell people who want to not
have a Guava conflict that they need to use the published shaded client jars.
I did miss this in this long thread. This is essentially saying that if you are
upgrading to 3.0
- Don't use hadoop-hdfs - this is our private interface. Use the client jar.
- If you want to use your own custom guava / jackson / whatever, use the
shaded client jars. May be always use shaded client jars to future proof
yourselves.
Did I read that right, [~busbey]?
While this is a change to downstream users, I can get behind this as the one
final step from 2.x to 3.x which will shield our users for all of the future.
> Shade Guava everywhere
> ----------------------
>
> Key: HADOOP-14284
> URL: https://issues.apache.org/jira/browse/HADOOP-14284
> Project: Hadoop Common
> Issue Type: Bug
> Components: build
> Affects Versions: 3.0.0-alpha4
> Reporter: Andrew Wang
> Assignee: Tsuyoshi Ozawa
> Priority: Blocker
> Attachments: HADOOP-14238.pre001.patch, HADOOP-14284.002.patch,
> HADOOP-14284.004.patch, HADOOP-14284.007.patch, HADOOP-14284.010.patch,
> HADOOP-14284.012.patch
>
>
> HADOOP-10101 upgraded the guava version for 3.x to 21.
> Guava is broadly used by Java projects that consume our artifacts.
> Unfortunately, these projects also consume our private artifacts like
> {{hadoop-hdfs}}. They also are unlikely on the new shaded client introduced
> by HADOOP-11804, currently only available in 3.0.0-alpha2.
> We should shade Guava everywhere to proactively avoid breaking downstreams.
> This isn't a requirement for all dependency upgrades, but it's necessary for
> known-bad dependencies like Guava.
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