Steve Loughran commented on HADOOP-13032:

Like you say, this is going to be pretty significant. It's changing a public 
API, no?

I'm not worried about FS implementations breaking in the move to 3.x; wondering 
if we have to care about client-side code?

Like your adoption of lambda expressions BTW.

> Refactor FileSystem$Statistics to use StorageStatistics
> -------------------------------------------------------
>                 Key: HADOOP-13032
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13032
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>            Reporter: Mingliang Liu
>            Assignee: Mingliang Liu
>         Attachments: HADOOP-13032.000.patch, HADOOP-13032.001.patch, 
> HADOOP-13032.002.patch, HADOOP-13032.003.patch
> [HADOOP-13065] added a new interface for retrieving FS and FC Statistics. 
> This jira is to track the effort of moving the {{Statistics}} class out of 
> {{FileSystem}}, and make it use that new interface.
> We should keep the thread local implementation. Benefits are:
> # they could be used in both {{FileContext}} and {{FileSystem}}
> # unified stats data structure
> # shorter source code
> Please note this will be an backwards-incompatible change.

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