Ich versuche, eine Umgebung mit niedriger Latenz einzuloggen.
2 hohe Priorität Threads rufen log.error() in einer engen Schleife (1Mmessages/s)Log4j2 im asynchronen Modus blockiert immer noch auf java.util.concurrent.lock unter hoher Last
I asynchrones Logging verwenden möchten (mit dem Disruptor) und überschüssige Nachrichten zu verwerfen. Also sollte der aufrufende Thread NIE blockieren.
Allerdings zeigt der Jstack deutlich, dass es etwa 100 mal/s blockiert.
Ist meine Konfiguration falsch? Oder ist die Blockierung unvermeidlich, wenn der Puffer voll ist?
java -Log4jContextSelector=org.apache.logging.log4j.core.async.AsyncLoggerContextSelector
-Dlog4j2.AsyncQueueFullPolicy=Discard
-Dlog4j2.DiscardThreshold=Trace
-DAsyncLogger.RingBufferSize=2000000 TestLog
"TT0" #14 prio=5 os_prio=0 tid=0x00007fe8cc690800 nid=0x2463 runnable [0x00007fe8ae70d000]
java.lang.Thread.State: RUNNABLE
at sun.misc.Unsafe.unpark(Native Method)
at java.util.concurrent.locks.LockSupport.unpark(LockSupport.java:141)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.unparkSuccessor(AbstractQueuedSynchronizer.java:662)
at java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1264)
at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:457)
at com.lmax.disruptor.BlockingWaitStrategy.signalAllWhenBlocking(BlockingWaitStrategy.java:72)
at com.lmax.disruptor.MultiProducerSequencer.publish(MultiProducerSequencer.java:218)
at com.lmax.disruptor.RingBuffer.translateAndPublish(RingBuffer.java:934)
at com.lmax.disruptor.RingBuffer.publishEvent(RingBuffer.java:444)
at com.lmax.disruptor.dsl.Disruptor.publishEvent(Disruptor.java:245)
at org.apache.logging.log4j.core.async.AsyncLogger.logMessage(AsyncLogger.java:285)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:727)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:716)
at org.apache.logging.log4j.spi.AbstractLogger.debug(AbstractLogger.java:232)
at TestLog$WriteToFile.run(TestLog.java:53)
at java.lang.Thread.run(Thread.java:745)
"AsyncLogger-1" #12 daemon prio=5 os_prio=0 tid=0x00007fe8cc96f800 nid=0x2460 waiting on condition [0x00007fe8b4187000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0x00000007104a0f28> (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
at com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:45)
at com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:55)
at com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:123)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Ich bin den Stack-Trace von 1 Schreiber zeige und den log4j2 Faden – user7564034