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https://issues.apache.org/jira/browse/HADOOP-5625?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12696560#action_12696560
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Hong Tang commented on HADOOP-5625:
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If we only care about lapsed time, maybe System.nanoTime a better choice?
(offering better resolution and is less expensive than currentTimeMillis)
> Add I/O duration time in client trace
> --------------------------------------
>
> Key: HADOOP-5625
> URL: https://issues.apache.org/jira/browse/HADOOP-5625
> Project: Hadoop Core
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.19.1
> Reporter: Lei Xu
> Assignee: Lei Xu
> Priority: Minor
> Fix For: 0.21.0
>
> Attachments: duration-1.patch, duration.patch
>
>
> Add I/O duration information into client trace log for analyzing performance.
>
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