Log4j 2
  1. Log4j 2
  2. LOG4J2-163

Create asynchronous Logger for low-latency logging


    • Type: Improvement Improvement
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 2.0-beta4
    • Fix Version/s: 2.0-beta5
    • Component/s: None
    • Labels:


      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.

      1. LOG4J2-163-log4j-async-20130331-images.zip
        187 kB
        Remko Popma
      2. LOG4J2-163-log4j-async-20130331a.patch
        277 kB
        Remko Popma
      3. LOG4J2-163-log4j-async-20130331.patch
        487 kB
        Remko Popma
      4. LOG4J2-163-log4j-async-20130320.patch
        434 kB
        Remko Popma
      5. LOG4J2-163-log4j-async.patch
        308 kB
        Remko Popma
      6. FastLog4j-v4-for-beta4.zip
        269 kB
        Remko Popma
      7. FastLog4j-v3-for-beta4.zip
        236 kB
        Remko Popma
      8. FastLog4j-v2-for-beta4.zip
        226 kB
        Remko Popma
      9. async-perf-comparison.png
        61 kB
        Remko Popma

        Issue Links



            • Assignee:
              Ralph Goers
              Remko Popma
            • Votes:
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              • Created: