Sampath created LOG4J2-2628:
-------------------------------
Summary: 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
Reporter: Sampath
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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