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https://issues.apache.org/jira/browse/BOOKKEEPER-563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13693540#comment-13693540
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Sijie Guo commented on BOOKKEEPER-563:
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{quote}
That said, its not vital to change it now. Worst case scenario is that the
feature is not enabled.
{quote}
for clarification,
there are bunch of os doesn't support posix_fadvise.
http://www.gnu.org/software/gnulib/manual/html_node/posix_005ffadvise.html
it would fail tests on mac if we don't have os checking.
http://mail-archives.apache.org/mod_mbox/cassandra-user/201104.mbox/%[email protected]%3E
> Avoid Journal polluting page cache
> ----------------------------------
>
> Key: BOOKKEEPER-563
> URL: https://issues.apache.org/jira/browse/BOOKKEEPER-563
> Project: Bookkeeper
> Issue Type: Improvement
> Reporter: Sijie Guo
> Assignee: Robin Dhamankar
> Fix For: 4.3.0
>
> Attachments: BOOKKEEPER-563.diff, BOOKKEEPER-563.reverse.diff
>
>
> writing data into journal which force the data in os buffer cache being used
> for hot reads, which could have negative affect on performance.
> similar solution is as CASSANDRA-1470.
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