[HDFS-9576] HTrace: collect position/length information on read operations

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.1
• Fix Version/s: 2.9.0, 3.0.0-alpha1
• Component/s: hdfs-client, tracing
• Target Version/s: 2.7.2
• Assignee: Zhe Zhang
• Reporter: Zhe Zhang
• Created: 18/Dec/15 20:30
• Updated: 30/Aug/16 01:21
• Resolved: 20/Jan/16 19:28

Description

HTrace currently collects the path of each read operation (both stateful and position reads). To better understand applications' I/O behavior, it is also useful to track the position and length of read operations.