[jira] [Created] (LOG4J2-574) Make Blocking the default WaitStrategy for Async Loggers

["Remko Popma (JIRA)" <ji...@apache.org>]

Remko Popma created LOG4J2-574:
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             Summary: Make Blocking the default WaitStrategy for Async Loggers
                 Key: LOG4J2-574
                 URL: https://issues.apache.org/jira/browse/LOG4J2-574
             Project: Log4j 2
          Issue Type: Improvement
          Components: Appenders
    Affects Versions: 2.0-rc1
            Reporter: Remko Popma
            Assignee: Remko Popma
             Fix For: 2.0-rc2


With Asynchronous Loggers, the wait strategy determines what the consumer thread does when the queue is empty and it is waiting for events. The LMAX Disruptor offers several options, as some specialized apps want to avoid the latency of waking up a blocked thread. These options have different trade-offs, with busy spin on one end of the spectrum and blocking on the other. 

In log4j we only expose a limited set of these options (no busy spin), and originally chose SleepingWait as the default as it seemed to have the best performance in testing.

It turned out that in some environments the current default of SleepingWaitStrategy may result in excessive CPU usage (LOG4J2-571). To avoid such problems this ticket proposes to change the default wait strategy for Async Loggers to BlockingWaitStrategy.



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