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https://issues.apache.org/jira/browse/COUCHDB-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Newson reopened COUCHDB-1218:
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The current fix was reverted due to the inability to truncate the file during
external log rotation. The performance improvements are still valuable so we
should revisit this for 1.3 (and possibly backport to 1.2.1 if there is one)
> Better logger performance
> -------------------------
>
> Key: COUCHDB-1218
> URL: https://issues.apache.org/jira/browse/COUCHDB-1218
> Project: CouchDB
> Issue Type: Improvement
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Fix For: 1.2.1, 1.3
>
> Attachments: 0001-Better-logger-performance.patch
>
>
> I made some experiments with OTP's disk_log module (available since 2001 at
> least) to use it to manage the log file.
> It turns out I got better throughput by using it. Basically it adopts a
> strategy similar to the asynchronous couch_file Damien described in this
> thread:
> http://mail-archives.apache.org/mod_mbox/couchdb-dev/201106.mbox/%[email protected]%3E
> Here's a benchmark with relaximation, 50 writers, 100 readers, documents of
> 1Kb, delayed_commits set to false and 'info' log level (default):
> http://graphs.mikeal.couchone.com/#/graph/9e19f6d9eeb318c70cabcf67bc013c7f
> The reads got a better throughput (bottom graph, easier to visualize).
> The patch (also attached here), which has a descriptive comment, is at:
> https://github.com/fdmanana/couchdb/compare/logger_perf.patch
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