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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14284) Shade Guava everywhere
Date Wed, 03 May 2017 00:39:04 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14284?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15994109#comment-15994109
] 

Vinod Kumar Vavilapalli commented on HADOOP-14284:
--------------------------------------------------

Are we sure this is the best approach? The 1.1MB patch just to shade guava is downright scary.
As we keep doing this for other libraries, I'm concerned if our code becomes more brittle
(changing imports everywhere) and if the build times explode.

Are there alternatives? Isn't it better to just shade our final artifacts instead of shading
individual libraries' jars? I remember  doing something of this sort in the very early stages
of YARN.

> 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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