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https://issues.apache.org/jira/browse/HDFS-16412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangyi Zhu updated HDFS-16412:
-------------------------------
    Description: 
Use RangeMapRange "Map<Long, MutableLong> fileSizeRange" to store counters at 
different intervals. RangeMap key is a specific interval, and value is the 
counter corresponding to the interval.

*Counter update:*
When the file size changes or the file is deleted, the file size is obtained, 
and the counter in the corresponding interval is called to update the counter.

*Interval division:*
The default is to initialize the startup according to the following interval, 
or it can be initialized through the configuration file.
0MB
0-16MB
16-32MB
32-64MB
64-128MB
128-256MB
256-512MB
>512MB

  was:
Use RangeMapRange "Map<Long, MutableLong> fileSizeRange" to store counters at 
different intervals. RangeMap key is a specific interval, and value is the 
counter corresponding to the interval.
**

*Counter update:*
When the file size changes or the file is deleted, the file size is obtained, 
and the counter in the corresponding interval is called to update the counter.
**

*Interval division:*
The default is to initialize the startup according to the following interval, 
or it can be initialized through the configuration file.
0MB
0-16MB
16-32MB
32-64MB
64-128MB
128-256MB
256-512MB
>512MB


> Add metrics to support obtaining file size distribution
> -------------------------------------------------------
>
>                 Key: HDFS-16412
>                 URL: https://issues.apache.org/jira/browse/HDFS-16412
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>    Affects Versions: 3.4.0
>            Reporter: Xiangyi Zhu
>            Assignee: Xiangyi Zhu
>            Priority: Minor
>
> Use RangeMapRange "Map<Long, MutableLong> fileSizeRange" to store counters at 
> different intervals. RangeMap key is a specific interval, and value is the 
> counter corresponding to the interval.
> *Counter update:*
> When the file size changes or the file is deleted, the file size is obtained, 
> and the counter in the corresponding interval is called to update the counter.
> *Interval division:*
> The default is to initialize the startup according to the following interval, 
> or it can be initialized through the configuration file.
> 0MB
> 0-16MB
> 16-32MB
> 32-64MB
> 64-128MB
> 128-256MB
> 256-512MB
> >512MB



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