logging-log4j-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Sampath Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4J2-1221) Dead lock observed in BlockingWaitStrategy in Log 4J
Date Sat, 12 Dec 2015 06:46:46 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1221?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15054090#comment-15054090
] 

Sampath Kumar edited comment on LOG4J2-1221 at 12/12/15 6:45 AM:
-----------------------------------------------------------------

Nope this is not resolved  by dropping the events. Ring Buffer Works on Producer and Consumer
Thread Model.This issue actually happened due to signal missed by consumer. As per LMAX disruptor
signal miss should not happen. However they are suspecting Solaris OS because of Native Calls
happening for Park and UnPark.


was (Author: sakumar):
Nope this is not resolved dropping the events. Ring Buffer Works on Producer and Consumer
Thread Model.This issue actually happened due to signal missed by consumer. As per LMAX distruptor
signal miss should not happen. However they are suspecting Solaris OS because of Native Calls
happening for Park and UnPark.

> Dead lock observed in BlockingWaitStrategy in Log 4J
> ----------------------------------------------------
>
>                 Key: LOG4J2-1221
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1221
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.2
>         Environment: log4J Version : 2.2 Disruptor Version : 3.3.2
> Ring Buffer Size : 128
> OS Version :
> cat /etc/release
> Oracle Solaris 11.2 X86
> Java Version
> java version "1.7.0_45"
> Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
> Java HotSpot(TM) Server VM (build 24.45-b08, mixed mode)
>            Reporter: Sampath Kumar
>            Priority: Critical
>              Labels: patch
>
> We have seen this behavior in during high load. Where Logging Got Stropped and Application
Went to not responsive state.
> log4J Version : 2.2 Disruptor Version : 3.3.2
> Ring Buffer Size : 128
> Producer(Multiples Threads) and Consumer Threads(Single Thread As per Log 4J Configuration)
Started Waiting on each other.
> Here is the one of the Trace from Thread Dump:
> Producer : 
> "[ACTIVE] ExecuteThread: '7' for queue: 'weblogic.kernel.Default (self-tuning)'" TIMED_WAITING
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:349)
> com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:136)
> com.lmax.disruptor.MultiProducerSequencer.next(MultiProducerSequencer.java:105)
> com.lmax.disruptor.RingBuffer.publishEvent(RingBuffer.java:444)
> com.lmax.disruptor.dsl.Disruptor.publishEvent(Disruptor.java:256)
> org.apache.logging.log4j.core.async.AsyncLogger.logMessage(AsyncLogger.java:285)
> org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:722)
> org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:693)
> org.apache.logging.log4j.jcl.Log4jLog.debug(Log4jLog.java:81)
> Consumer Thread :
> "AsyncLogger-1" waiting for lock java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@5d972983
WAITING
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> com.lmax.disruptor.BlockingWaitStrategy.waitFor(BlockingWaitStrategy.java:45)
> com.lmax.disruptor.ProcessingSequenceBarrier.waitFor(ProcessingSequenceBarrier.java:55)
> com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:123)
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> java.lang.Thread.run(Thread.java:744)
> Is this is known issue which got already fixed in recent build ?



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

---------------------------------------------------------------------
To unsubscribe, e-mail: log4j-dev-unsubscribe@logging.apache.org
For additional commands, e-mail: log4j-dev-help@logging.apache.org


Mime
View raw message