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https://issues.apache.org/jira/browse/YARN-5184?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15647241#comment-15647241
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Steve Loughran commented on YARN-5184:
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I'd rather not make things abstract for 3.x.
* Every incompatible API change is another barrier to migration. We don't want
Hadoop 3 to be python 3.
* Some of us regularly build against -trunk already; I'm doing that with Spark
and the s3guard branch. Incompatible changes really complicate my life
> Fix up incompatible changes introduced on ContainerStatus and NodeReport
> ------------------------------------------------------------------------
>
> Key: YARN-5184
> URL: https://issues.apache.org/jira/browse/YARN-5184
> Project: Hadoop YARN
> Issue Type: Bug
> Components: api
> Affects Versions: 2.8.0, 2.9.0
> Reporter: Karthik Kambatla
> Assignee: Sangjin Lee
> Priority: Blocker
> Attachments: YARN-5184-branch-2.8.poc.patch,
> YARN-5184-branch-2.poc.patch
>
>
> YARN-2882 and YARN-5430 broke compatibility by adding abstract methods to
> ContainerStatus. Since ContainerStatus is a Public-Stable class, adding
> abstract methods to this class breaks any extensions.
> To fix this, we should add default implementations to these new methods and
> not leave them as abstract.
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