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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14284) Shade Guava everywhere
Date Tue, 09 May 2017 09:41:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16002380#comment-16002380
] 

Steve Loughran commented on HADOOP-14284:
-----------------------------------------

One thing [~ozawa] calls out: once we shade we can be *more aggressive* in using guava bits,
as we don't have to worry about downstream breakage. What we do have to do is be consistent
in shadeage (?), and confident that there's no leakage of guava structures, not just in "public"
APIs, but in common override points/subclassings.

I can see we'll need to do this for all the cloud storage modules too; cnauroth added a hadoop-cloudprojects
POM module, but maybe we'll need to do something which shades.


> 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-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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