Remko Popma created LOG4J2-2048:
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Summary: Increase default queue size for AsyncAppender
Key: LOG4J2-2048
URL: https://issues.apache.org/jira/browse/LOG4J2-2048
Project: Log4j 2
Issue Type: Improvement
Components: Appenders
Affects Versions: 2.9.0
Reporter: Remko Popma
Assignee: Remko Popma
Fix For: 2.9.1
LOG4J2-2031 highlighted that the default queue size (128) for AsyncAppender is
extremely small compared to the async logger defaults.
Even small event bursts will likely fill up the queue and cause messages to
appear in the log file out of order. Until LOG4J2-2031 is fixed, a larger queue
size will make this less likely to happen.
Better recursion detection (see LOG4J2-2031) will fix the out-of-sequence
messages. From that point, when the queue is full the logging call will block
until a slot in the queue becomes available, so the only impact of a small
queue is performance. From a performance perspective it is also desirable to
have a default queue size of something like 1K slots to handle moderate-size
bursts of events smoothly.
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