[HDFS-16971] Add read time metrics for remote reads in Statistics

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: hdfs
• Labels: pull-request-available
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Melissa You
• Reporter: Melissa You
• Created: 04/Apr/23 05:44
• Updated: 28/Jan/24 07:10
• Resolved: 13/Apr/23 16:08

Description

In Filesystem.java, currently it only collects bytes read not the corresponding timing of reads.
In particular, we're interested in time spent on remote reads(not local reads). Adding timing info will help us understand it better and further analyze how locality of DN behaves. 

Issue Links

• links to: GitHub Pull Request #5536