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https://issues.apache.org/jira/browse/HADOOP-14394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16452496#comment-16452496
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Steve Loughran commented on HADOOP-14394:
-----------------------------------------
Probably to stop people subclassing it as a sanity check. I have no issues with
making it non-final, other than my usual unhappiness with mocking:
https://www.slideshare.net/steve_l/i-hate-mocking
> Provide Builder pattern for DistributedFileSystem.create
> --------------------------------------------------------
>
> Key: HADOOP-14394
> URL: https://issues.apache.org/jira/browse/HADOOP-14394
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Affects Versions: 2.9.0
> Reporter: Lei (Eddy) Xu
> Assignee: Lei (Eddy) Xu
> Priority: Major
> Fix For: 2.9.0, 3.0.0-alpha4
>
> Attachments: HADOOP-14394.00.patch, HADOOP-14394.01.patch,
> HADOOP-14394.02.patch, HADOOP-14394.03.patch, HADOOP-14394.04.patch,
> HADOOP-14394.05.patch
>
>
> This JIRA continues to refine the {{FSOutputStreamBuilder}} interface
> introduced in HDFS-11170.
> It should also provide a spec for the Builder API.
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