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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (LOG4J2-163) Create asynchronous Logger for low-latency logging
Date Tue, 02 Apr 2013 22:33:15 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Remko Popma updated LOG4J2-163:
-------------------------------

    Attachment:     (was: documentation-update-20130402.patch)
    
> Create asynchronous Logger for low-latency logging
> --------------------------------------------------
>
>                 Key: LOG4J2-163
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-163
>             Project: Log4j 2
>          Issue Type: Improvement
>    Affects Versions: 2.0-beta4
>            Reporter: Remko Popma
>            Assignee: Ralph Goers
>             Fix For: 2.0-beta5
>
>         Attachments: async-perf-comparison.png, FastLog4j-v2-for-beta4.zip, FastLog4j-v3-for-beta4.zip,
FastLog4j-v4-for-beta4.zip, LOG4J2-163-log4j-async-20130320.patch, LOG4J2-163-log4j-async-20130331a.patch,
LOG4J2-163-log4j-async-20130331-images.zip, LOG4J2-163-log4j-async-20130331.patch, LOG4J2-163-log4j-async.patch
>
>
> One of the main considerations for selecting a logging library is performance, specifically,
how long it takes for a call to Logger.log to return. (See the comments of LOG4J-151 for a
discussion of latency versus application throughput and logging throughput.)
> I believe it is possible to improve this performance by an order of magnitude by having
an asynchronous Logger implementation that hands off the work to a separate thread as early
as possible. The disk I/O would be done in this separate thread. 
> AsynchAppender is not a good match for these requirements, as with that approach (a)
the logging call still needs to flow down the hierarchy to the appender, doing synchronization
and creating objects at various points on the way, and (b) when serializing the LogEvent,
the getSource() method is always called, which is expensive.

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