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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6940) Initial refactoring to allow ConsensusNode implementation
Date Tue, 09 Sep 2014 18:53:31 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14127392#comment-14127392
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Chris Douglas commented on HDFS-6940:
-------------------------------------

bq. This issue is being rejected based on an anticipation of some future interfaces (which
I agreed to discuss), rather than technical objections to the patch.

Relaxing the visibility of methods makes an interface of them. By way of example (beyond those
[~atm] cited), the refactoring also changes methods explicitly tagged as {{@VisibleForTesting}}
to be public. Other interfaces may be built on top of these as you intend, but the objection
is that this _already_ creates new APIs that users could extend, believing them to be stable.
While the methods added by the patch may be a coherent, logical set, the rationale is neither
documented nor codified in an interface/plugin.

> Initial refactoring to allow ConsensusNode implementation
> ---------------------------------------------------------
>
>                 Key: HDFS-6940
>                 URL: https://issues.apache.org/jira/browse/HDFS-6940
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 2.0.6-alpha, 2.5.0
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>             Fix For: 2.6.0
>
>         Attachments: HDFS-6940.patch
>
>
> Minor refactoring of FSNamesystem to open private methods that are needed for CNode implementation.



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