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https://issues.apache.org/jira/browse/BOOKKEEPER-536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13763978#comment-13763978
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Sijie Guo commented on BOOKKEEPER-536:
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remove it from 4.3.0 since it is not urgent.
> The overhead of ReadAheadCache is too large
> -------------------------------------------
>
> Key: BOOKKEEPER-536
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-536
> Project: Bookkeeper
> Issue Type: Bug
> Components: hedwig-server
> Reporter: Jiannan Wang
>
> 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.
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