[jira] [Created] (LOG4J2-1410) Add new LiteTimeoutBlockingWaitStrategy for Async Loggers

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

Remko Popma created LOG4J2-1410:
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             Summary: Add new LiteTimeoutBlockingWaitStrategy for Async Loggers
                 Key: LOG4J2-1410
                 URL: https://issues.apache.org/jira/browse/LOG4J2-1410
             Project: Log4j 2
          Issue Type: New Feature
          Components: Core
    Affects Versions: 2.6
            Reporter: Remko Popma
            Assignee: Remko Popma
             Fix For: 2.7


Discussion on the Mechanical Sympathy mailing list {brought to light|https://groups.google.com/d/msg/mechanical-sympathy/klefjRqlpQE/0wpjUkE9AwAJ] an interesting aspect of using the Disruptor under light loads: if the background thread has no work to do because the queue is empty, it will block, and await a signal that more work has been put onto the queue.

Sending this signal is done in the application thread when a new log event is enqueued. This is done by obtaining the shared Lock and calling Condition.signal(). Now, if multiple application threads try to do this signalling at the same time, one of them will be suspended by the OS. This may be costly, and unnecessary, because waking up the background thread twice is wasteful.

The Disruptor contains the [LiteBlockingWaitStrategy|https://github.com/LMAX-Exchange/disruptor/blob/master/src/main/java/com/lmax/disruptor/LiteBlockingWaitStrategy.java] for this.

Log4j uses the [TimeoutBlockingWaitStrategy|https://github.com/LMAX-Exchange/disruptor/blob/master/src/main/java/com/lmax/disruptor/TimeoutBlockingWaitStrategy.java] by default since we had a report of a deadlock with BlockingWaitStrategy on Solaris (LOG4J2-1221).

This ticket proposes to create a custom wait strategy that combines LiteBlockingWaitStrategy with TimeoutBlockingWaitStrategy.



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