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https://issues.apache.org/jira/browse/LOG4J2-2628?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sampath updated LOG4J2-2628:
----------------------------
Environment:
Linux
Log4j 2.11.1
> Out of Memory issue log4j2 Async Appender stops
> -----------------------------------------------
>
> Key: LOG4J2-2628
> URL: https://issues.apache.org/jira/browse/LOG4J2-2628
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.11.1
> Environment: Linux
> Log4j 2.11.1
>
> Reporter: Sampath
> Priority: Critical
> Fix For: 2.11.1
>
>
> In one of the systems observed below out of memory
> ```java.lang.OutOfMemoryError: Java heap space
> at java.util.Arrays.copyOf(Arrays.java:3332) ~[?:1.8.0_181]
> at
> java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:124)
> ~[?:1.8.0_181]
> at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:448)
> ~[?:1.8.0_181]
> at java.lang.StringBuilder.append(StringBuilder.java:136) ~[?:1.8.0_181]
> at
> org.apache.logging.log4j.core.pattern.LineSeparatorPatternConverter.format(LineSeparatorPatternConverter.java:66)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.layout.PatternLayout$PatternSerializer.toSerializable(PatternLayout.java:334)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:233)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:218)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:58)
> ~[log4j-core-2.11.1.jar:2.11.1]
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:177)
> ~[log4j-core-2.11.1.jar:2.11.1] ```
> Here out of memory can be due to application issue, However system didn't
> recover as the consumer thread AsyncAppender$AsyncThread got stopped
> Later all log4j producer thread starts waiting below, This results in not
> releasing the heap. the only option to recover it by restart the system. Is
> there any fix/option available, so that producer thread won't block and Async
> consumer thread recovers.
> ```
> java.lang.Thread.State: WAITING
> at sun.misc.Unsafe.park(Native Method)
> - waiting on
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1917df7d
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039)
> at java.util.concurrent.ArrayBlockingQueue.put(ArrayBlockingQueue.java:353)
> at
> org.apache.logging.log4j.core.appender.AsyncAppender.logMessageInBackgroundThread(AsyncAppender.java:204)
> at
> org.apache.logging.log4j.core.async.EventRoute$1.logMessage(EventRoute.java:51)
> at
> org.apache.logging.log4j.core.appender.AsyncAppender.append(AsyncAppender.java:170)
> at
> org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:464)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:448)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:455)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:450)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:431)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:406)
> at
> org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
> at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
> at
> org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2170)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2125)
> ```
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