[HBASE-12463] MemstoreLAB reduce #objects created

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 0.99.0
• Component/s: Performance
• Assignee: Unassigned
• Reporter: Anoop Sam John
• Created: 12/Nov/14 09:01
• Updated: 17/Jun/22 17:55
• Resolved: 20/Dec/14 01:40

Description

By default Memstore uses MSLAB. For each of the Cell added to memstore, we will allocate area in MSLAB and return the area in BR wrapper. So each time a new BR object is created. Instead of this we can have ThreadLocal level BR instance and each time when allocate() API return the BR, we can set the byte[], offset, length on this ThreadLocal level BR instance. So totally only those many objects as the threads count (max handler count)

Issue Links

• is related to: HBASE-15512 Avoid cell allocation on Store.add(Cell)