[HDFS-12524] Ozone: Record number of keys scanned and hinted for getRangeKVs call

• Type: Sub-task
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: HDFS-7240
• Component/s: logging, ozone
• Labels: logging ozoneMerge performance
• Target Version/s: HDFS-7240
• Hadoop Flags: Reviewed
• Assignee: Weiwei Yang
• Reporter: Weiwei Yang
• Created: 21/Sep/17 08:39
• Updated: 26/Apr/18 21:54
• Resolved: 26/Sep/17 11:34

Description

Add debug logging to record number of keys scanned and hinted for getRangeKVs calls, this will be helpful to debug performance issues since getRangeKVs is often the place where we get the lag.