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https://issues.apache.org/jira/browse/HDFS-6156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13949563#comment-13949563
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Shinichi Yamashita commented on HDFS-6156:
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Thank you for your comment. And, I think that we do not need to convert List 
into Arrays.
I attach the patch file.

> Simplify the JMX API that provides snapshot information
> -------------------------------------------------------
>
>                 Key: HDFS-6156
>                 URL: https://issues.apache.org/jira/browse/HDFS-6156
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Haohui Mai
>         Attachments: HDFS-6156.patch
>
>
> HDFS-5196 introduces a set of new APIs that provide snapshot information 
> through JMX. Currently. The API nests {{SnapshotDirectoryMXBean}} into 
> {{SnapshotStatsMXBean}}, creating another layer of composition.
> This jira proposes to inline {{SnapshotDirectoryMXBean}} into 
> {{SnapshotStatsMXBean}} and to simplify the API.



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