[HBASE-27146] Avoid CellUtil.cloneRow in MetaCellComparator

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.5.0, 3.0.0-alpha-4, 2.4.14
• Component/s: meta, Offheaping, Performance
• Hadoop Flags: Reviewed
• Assignee: Duo Zhang
• Reporter: Duo Zhang
• Created: 21/Jun/22 13:24
• Updated: 25/Jun/22 19:51
• Resolved: 24/Jun/22 14:43

Description

In HBASE-26981, a flame graph shows that we spend a lot of CPUs in CellUtils.cloneXXX.

Since we need to split the row to different parts when comparing, we can not use ByteBuffer compare directly, but as least, we should try to avoid copy the content when the Cell is stored in a ByteBuffer.

Issue Links

• is related to: HBASE-26981 The CPU usage of the regionserver node where the meta table is located is too high
• links to: GitHub Pull Request #4571