[BOOKKEEPER-47] Improve readAhead cache size estimation to avoid OutOfMemory exception

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Affects Version/s: 4.0.0
• Component/s: hedwig-server
• Assignee: Unassigned
• Reporter: Sijie Guo
• Created: 16/Aug/11 10:59
• Updated: 16/Mar/16 04:21
• Resolved: 16/Mar/16 04:21

Description

Currently, ReadAhead Cache estimate the cache size just calculating the message size. But the memory used by java objects, cache key are not included. So the memory is consumed much faster than estimation, which cause OutOfMemory.