[HBASE-24831] Avoid invoke Counter using reflection in SnapshotInputFormat

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.4.0, 2.3.2
• Labels: Performance mapreduce snapshot
• Hadoop Flags: Reviewed
• Assignee: Yechao Chen
• Reporter: Yechao Chen
• Created: 07/Aug/20 04:55
• Updated: 16/Sep/20 15:44
• Resolved: 15/Sep/20 15:07

Description

In TableRecordReaderImpl we invoke Counter increment by reflection

This will be called nextKeyValue() in TableSnapshotInputFormat 

reflection invoke is very slower than normal method call

we can avoid these to improve the read performance

Issue Links

• links to: GitHub Pull Request #2209
• links to: GitHub Pull Request #2403