[HBASE-13894] Avoid visitor alloc each call of ByteBufferArray get/putMultiple()

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.0.1, 1.1.0, 2.0.0
• Fix Version/s: 1.2.0, 1.1.1, 2.0.0
• Component/s: regionserver
• Assignee: Matteo Bertozzi
• Reporter: Matteo Bertozzi
• Created: 12/Jun/15 15:02
• Updated: 24/Jun/22 19:20
• Resolved: 15/Jun/15 16:27

Description

ByteBufferArray getMultiple()/putMultiple() creates a new Visitor each call. we can move that visitor out.

also, ByteBufferArray.multiple() seems to be an hotspot, I tried to do some experiments using slice and read/write lock instead of a mutex, doesn't seems to change much. any thoughts?