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https://issues.apache.org/jira/browse/HDFS-4095?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-4095:
----------------------------

    Attachment: HDFS-4095.001.patch

Initial patch defining a group of snapshot-related metrics. 
                
> Add snapshot related metrics
> ----------------------------
>
>                 Key: HDFS-4095
>                 URL: https://issues.apache.org/jira/browse/HDFS-4095
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: data-node, name-node
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-4095.001.patch
>
>
> Add metrics for number of snapshots in the system, including 1) number of 
> snapshot files, and 2) number of snapshot only files (snapshot file that are 
> not deleted but the original file is already deleted).

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