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https://issues.apache.org/jira/browse/LOG4J2-2155?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16299502#comment-16299502
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Gary Gregory commented on LOG4J2-2155:
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Can you verify these results with our current version 2.10.0?
> alway full gc on low memory
> ---------------------------
>
> Key: LOG4J2-2155
> URL: https://issues.apache.org/jira/browse/LOG4J2-2155
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.8.2
> Environment: centos6.8 ,jdk8
> Reporter: Liao,Kucheng
> Attachments: log4j-exception1.png, log4j-exception2.png,
> log4j2-exception3.png, log4j2.xml
>
>
> my web project run on a low memory jvm , the configurate :
> JAVA_OPTS="
> -server
> -Xmx2g
> -Xms400m
> -Xmn200m
> -XX:+UseConcMarkSweepGC
> -XX:+UseParNewGC
> -XX:CMSInitiatingOccupancyFraction=85
> -XX:-UseBiasedLocking
> -XX:+UseCompressedOops
> -XX:+UseCompressedClassPointers
> -XX:-UseCounterDecay
> "
> its a webSocket server conaint webSocket and http, i deploy more than 10
> nodes on production.
> today ,i find 2 nodes cup is full ,i check it , jvm aways run full gc :
> [deployUser@iZbp1bk0r4lgrkltait03cZ bin]$ jstat -gcutil 5749
> S0 S1 E O M CCS YGC YGCT FGC FGCT
> GCT
> 0.00 0.00 4.48 25.75 94.23 87.43 44 0.443 443836 54806.448
> 54806.891
> [deployUser@iZbp1bk0r4lgrkltait03cZ bin]$
> i dump jvm and find :
> [deployUser@iZbp1bk0r4lgrkltait03cZ ~]$ more jmap
> num #instances #bytes class name
> ----------------------------------------------
> 1: 25162 21011520 [B
> 2: 67545 10520864 [C
> 3: 262144 6291456
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor$Log4jEventWrapper
> 4: 14916 1970880 [Ljava.lang.Object;
> 5: 6895 1867456 [I
> 6: 65777 1578648 java.lang.String
> 7: 13242 1165296 java.lang.reflect.Method
> 8: 9211 1024960 java.lang.Class
> 9: 21687 693984 java.util.HashMap$Node
> 10: 4886 351792
> io.netty.channel.DefaultChannelHandlerContext
> i think Log4jEventWrapper is too many, i look the source code ,the default
> Disruptor size is 256 * 1024.
> maven config :
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-slf4j-impl</artifactId>
> <version>2.8.2</version>
> </dependency>
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-core</artifactId>
> <version>2.8.2</version>
> </dependency>
> <dependency>
> <groupId>org.apache.logging.log4j</groupId>
> <artifactId>log4j-web</artifactId>
> <version>2.8.2</version>
> </dependency>
> <dependency>
> <groupId>org.slf4j</groupId>
> <artifactId>slf4j-api</artifactId>
> <version>1.7.9</version>
> </dependency>
> <dependency>
> <groupId>com.lmax</groupId>
> <artifactId>disruptor</artifactId>
> <version>3.2.0</version>
> </dependency>
>
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