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https://issues.apache.org/jira/browse/HADOOP-14957?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213301#comment-16213301
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Andrew Wang commented on HADOOP-14957:
--------------------------------------

We're supposed to deprecate in a prior major release before removing. So, we'd 
be violating source compatibility if we remove in 3.0.

That said, it's better to do it in 3.0 than some minor release, and I think we 
did a similar change already for some YARN API. I think datanode 
reconfiguration is also only really used for DN hotswap. So, it's not *that* 
critical, and since we maintain wire compatibility, Hadoop 2 client JARs will 
keep working.

> ReconfigurationTaskStatus is exposing guava Optional in its public api
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-14957
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14957
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: common
>    Affects Versions: 3.0.0-beta1
>            Reporter: Haibo Chen
>            Assignee: Haibo Chen
>         Attachments: HADOOP-14957.prelim.patch
>
>




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