Memory Usage Increase in Log4j2 2.24.3 with Async Logging Due to RingBufferLogEvent
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调研方向
从 Log4j2 2.23.1 到 2.24.3 之间引入的 RingBufferLogEvent 和 RingBuffer 内存管理变更入手,并使用提供的异步日志配置作为复现上下文。比较两个版本中的堆行为,并确定报告的增长是预期现象还是回归;完成的标准是记录原因和可复现的结果。
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描述
Description
I am using Log4j2 in my project and recently upgraded from version 2.23.1 to 2.24.3. The application employs an asynchronous logging strategy with Disruptor version 3.4.3. Below is the relevant configuration:
log4j2.contextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelectorlog4j2.asyncQueueFullPolicy=org.apache.logging.log4j.core.async.DiscardingAsyncQueueFullPolicylog4j2.discardThreshold=ERRORlog4j2.asyncLoggerWaitStrategy=Yieldlog4j2.asyncLoggerRingBufferSize=1048576
The logging frequency in my application is relatively low, averaging about 10 log entries per second. When using version 2.23.1, memory usage remained stable based on monitoring data . However, after upgrading to 2.24.3, I observed a gradual increase in memory usage over time, which eventually stabilizes at a fixed threshold.
This behavior differs significantly from what I experienced with 2.23.1. Through heap dump analysis at different time intervals, I confirmed that the memory growth is primarily associated with RingBufferLogEvent objects within Log4j2’s RingBuffer implementation, with the RingBuffer’s memory footprint consistently increasing over time.
I noticed that the 2.24.3 release includes several changes related to memory management. Could any of these changes, particularly those affecting the RingBuffer or RingBufferLogEvent, explain the behavior I am observing?
If additional details are needed, please let me know, and I’d be happy to provide them.
Environment
- Log4j2 Version: 2.24.3 (upgraded from 2.23.1)
- Disruptor Version: 3.4.3
- JVM: Zing24.08.101.0+1 (build 21.0.4.0.101+1-LTS)
- Logging Frequency: ~10 logs/second
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