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https://issues.apache.org/jira/browse/HADOOP-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15990982#comment-15990982
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Allen Wittenauer commented on HADOOP-14284:
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bq. I'm pretty sure unit tests still dominate the build time.

After that, I wouldn't be surprised if it's YARN.  It's gotten *fat*. It is 
likely 2x-3x what it used to be a few years ago.  (esp with TL2 and all of the 
node.js bits)  On disk, all the gains we made by de-duping the dependency jars 
in trunk (HADOOP-10115) have pretty much been lost due to YARN's growth.

> 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-alpha3
>            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-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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