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https://issues.apache.org/jira/browse/HADOOP-13363?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16166990#comment-16166990
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Andrew Wang commented on HADOOP-13363:
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I consider shading a prerequisite for the PB upgrade. If we shade, there aren't
any API/ABI compatibility issues. We need wire-compatibility no matter when we
upgrade, whether it's from 2.x to 3.0, or 2.x to 3.1.
Also, the motivation I've heard for upgrading is to make it easier for devs to
build Hadoop since it's hard to find a copy of PB 2.5.0. If that's the problem,
there are other solutions that do not have any downstream user impact. For
instance, hosting the PB 2.5.0 binary somewhere, or providing it in a docker
image.
> Upgrade protobuf from 2.5.0 to something newer
> ----------------------------------------------
>
> Key: HADOOP-13363
> URL: https://issues.apache.org/jira/browse/HADOOP-13363
> Project: Hadoop Common
> Issue Type: Improvement
> Components: build
> Affects Versions: 3.0.0-alpha1, 3.0.0-alpha2
> Reporter: Allen Wittenauer
> Assignee: Tsuyoshi Ozawa
> Attachments: HADOOP-13363.001.patch, HADOOP-13363.002.patch,
> HADOOP-13363.003.patch, HADOOP-13363.004.patch, HADOOP-13363.005.patch
>
>
> Standard protobuf 2.5.0 does not work properly on many platforms. (See, for
> example, https://gist.github.com/BennettSmith/7111094 ). In order for us to
> avoid crazy work arounds in the build environment and the fact that 2.5.0 is
> starting to slowly disappear as a standard install-able package for even
> Linux/x86, we need to either upgrade or self bundle or something else.
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