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From "Robert Newson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1218) Better logger performance
Date Wed, 13 Jul 2011 11:50:02 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1218?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13064500#comment-13064500
] 

Robert Newson commented on COUCHDB-1218:
----------------------------------------

Ok, I get that. I wonder if we can't make a simple module that does those things (the async
queue, flush for errors, etc) without pulling in disk_log? disk_log demonstrates that those
things improve logging performance, which is a good thing. Doing likewise in couch_log would
give us the boost and keep the simplicity.

I mention syslog in passing because we generally replace/disable couch_log anyway (sending
output to /dev/null and using runit to capture console output to a managed log file, or replacing
it with a custom logger that sends to syslog). A program that manages its own log files, rather
than integrating with the OS's logging system is generally annoying to manage. I'd keep this
one simple.


> 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
>         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/%3C5C39FB5A-0ACA-4FF9-BD90-2EBECF271850@apache.org%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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