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https://issues.apache.org/jira/browse/HADOOP-13283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15338666#comment-15338666
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Steve Loughran commented on HADOOP-13283:
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for the tests i was doing, i was just thinking of having a "snapshot" operation
which took the enum, built a list of the "before" Values, could do the same
with the next set, and so let me compare them. That's where I'm doing explicit
diffs of state (see {{S3ATestUtils.MetricDiff for the feature on a single
metric, with integrated assertions}}...I think production code might prefer the
reset, just to avoid having to keep the original metric snapshot around
> Support reset operation for new global storage statistics and per FS storage
> stats
> ----------------------------------------------------------------------------------
>
> Key: HADOOP-13283
> URL: https://issues.apache.org/jira/browse/HADOOP-13283
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs
> Reporter: Mingliang Liu
> Assignee: Mingliang Liu
> Fix For: 2.8.0
>
>
> Applications may reuse the file system object across jobs and its storage
> statistics should be reset. Specially the {{FileSystem.Statistics}} supports
> reset and [HADOOP-13032] needs to keep that use case valid.
> This jira is for supporting reset operations for storage statistics.
> Thanks [~hitesh] for reporting this.
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