[BOOKKEEPER-536] The overhead of ReadAheadCache is too large

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Won't Fix
• Component/s: hedwig-server
• Assignee: Unassigned
• Reporter: Jiannan Wang
• Created: 07/Jan/13 10:29
• Updated: 16/Mar/16 04:21
• Resolved: 16/Mar/16 04:21

Description

Testing with 300 bytes per message, we observed that when the presentCacheSize is 128M, while the readAheadCache size is ~800M. Total ratio is 800/128 ~= 6.25 with 5.25 times overhead.
So if user sets readAheadCache limit size to 2G, it may consumes maximum about 15G which is too large.