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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LOG4J2-164) Add methods is/setEndOfBatch to LogEvent (buffered appender performance improvement)
Date Mon, 11 Feb 2013 06:55:12 GMT
Remko Popma created LOG4J2-164:
----------------------------------

             Summary: Add methods is/setEndOfBatch to LogEvent (buffered appender performance
improvement)
                 Key: LOG4J2-164
                 URL: https://issues.apache.org/jira/browse/LOG4J2-164
             Project: Log4j 2
          Issue Type: Improvement
          Components: Core
    Affects Versions: 2.0-beta4
            Reporter: Remko Popma


Many buffered Appenders have an attribute "immediateFlush" that gives users the option to
follow each write with a flush to ensure that all messages are available on disk. The drawback
of the immediateFlush idiom is the performance impact of touching the disk on every single
event.

If the appender could determine from the current LogEvent whether any more events are expected,
it could avoid unnecessary flushes and only write to disk when the last event was received
(or the buffer is full). 

This would work especially nicely when receiving bursts of events - a common scenario - when
you want to avoid adding more overhead to a system that is already very busy.

Asynchronous loggers and appenders are well-positioned to use such a mechanism: they can easily
call LogEvent.setEndOfBatch(true) if the current event is the last one in the queue.

The patches I proposed for LOG4J2-151 and LOG4J2-163 already use this mechanism internally
with the FastFileAppender included in these patches, but I think the idea is generally applicable
to any buffered appender.


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