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https://issues.apache.org/jira/browse/HADOOP-13714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16167627#comment-16167627
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Steve Loughran commented on HADOOP-13714:
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* interface declaration stability. Do we plan to change them. We could have a
@Public.RemovedInFuture versions, perhaps.
* transitive dependencies. We already talk a lot about this, but cannot
guarantee that things won't change. Maybe: shaded client jar only one with
guarantees
* transitive protocol dependencies. Say ZK changed its wire format? Then the ZK
JAR would need an update, and, even shaded, would imply the need to work with
an updated ZK service. Same for S3 auth mechanisms, kerberos, ...
Other fun issues
* when would OS version support be removed? That's full OS (windows) as well as
variants (32-bit x86)
* when would we cut a filesystem (s3n and s3n are going from hadoop-aws in
3.0)? . Maybe: major, unless there's a migration path to a successor client
(which can involve: switching to an external implementation).
> Tighten up our compatibility guidelines for Hadoop 3
> ----------------------------------------------------
>
> Key: HADOOP-13714
> URL: https://issues.apache.org/jira/browse/HADOOP-13714
> Project: Hadoop Common
> Issue Type: Improvement
> Components: documentation
> Affects Versions: 2.7.3
> Reporter: Karthik Kambatla
> Assignee: Daniel Templeton
> Priority: Blocker
> Attachments: Compatibility.pdf, HADOOP-13714.001.patch,
> HADOOP-13714.002.patch, HADOOP-13714.003.patch, HADOOP-13714.004.patch,
> HADOOP-13714.005.patch, HADOOP-13714.WIP-001.patch,
> InterfaceClassification.pdf
>
>
> Our current compatibility guidelines are incomplete and loose. For many
> categories, we do not have a policy. It would be nice to actually define
> those policies so our users know what to expect and the developers know what
> releases to target their changes.
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