[HBASE-19977] FileMmapEngine allocation of byte buffers should be synchronized

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.0-alpha-4
• Fix Version/s: 2.0.0-beta-2, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: ramkrishna.s.vasudevan
• Reporter: ramkrishna.s.vasudevan
• Created: 12/Feb/18 09:08
• Updated: 01/Aug/18 06:21
• Resolved: 13/Feb/18 10:22

Description

Recently we have been testing bucket cache with mmap mode. We found that after the multi threading way of allocating the byte buffers for offheap bucket cache, the creation of the mmapped byte buffers needs to be synchronized for allocating the right sized mmapped buffers.