[HBASE-2496] Less ArrayList churn on the scan path

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.20.3
• Fix Version/s: 0.90.0
• Hadoop Flags: Reviewed
• Assignee: Jean-Daniel Cryans
• Reporter: Jean-Daniel Cryans
• Created: 28/Apr/10 00:41
• Updated: 20/Nov/15 12:41
• Resolved: 28/Apr/10 18:00

Description

Doing some profiling when testing the scanning speed of 0.20.4, I saw that we are spending a lot of time instantiating ArrayLists when scanning and that we could sometime set the right size of the arrays. I don't expect big improvements for short scans, but people like us who are scanning in batches of 10k could get some nice speedups.