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Atlassian Confluence:Component ‘Operating System’ alerted ‘Low free memory’ and Component ‘Java’ alerted ‘Garbage collection exceeded time limit’

Seeing the following alerts?

[2020-04-17 21:53:30,207] 2020-04-18T01:53:30.200Z Component 'Operating System' alerted 'Low free memory' (details: {"freeInMegabytes":62,"totalInMegabytes":5805,"minimumInMegabytes":256}, trigger: {"pluginKey": "not-detected"})
[2021-12-13 06:44:52,432] 2021-12-13T11:44:48.953Z Component ‘Java’ alerted ‘Garbage collection exceeded time limit’ (details: {“durationInMillis”:2181,”windowInMillis”:20000,”limitPercent”:10,”threadMemoryAllocations”:””,”threadDump”:[]}, trigger: {"pluginKey": "not-detected"})

Time to up the memory on the host and adjust the environment properties:

/atlas/atlassian/confluence/ cat bin/setenv.sh
# See the CATALINA_OPTS below for tuning the JVM arguments used to start Confluence.

echo "If you encounter issues starting up Confluence, please see the Installation guide at http://confluence.atlassian.com/display/DOC/Confluence+Installation+Guide"

……..

# Set the JVM arguments used to start Confluence.
# For a description of the vm options of jdk 8, see:
# http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html
# For a description of the vm options of jdk 11, see:
# https://docs.oracle.com/en/java/javase/11/tools/java.html
CATALINA_OPTS="-XX:+IgnoreUnrecognizedVMOptions ${CATALINA_OPTS}"
CATALINA_OPTS="-XX:-PrintGCDetails -XX:+PrintGCDateStamps -XX:-PrintTenuringDistribution ${CATALINA_OPTS}"
CATALINA_OPTS="-Xlog:gc+age=debug:file=$LOGBASEABS/logs/gc-`date +%F_%H-%M-%S`.log::filecount=5,filesize=2M ${CATALINA_OPTS}"
CATALINA_OPTS="-Xloggc:$LOGBASEABS/logs/gc-`date +%F_%H-%M-%S`.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=2M ${CATALINA_OPTS}"
CATALINA_OPTS="-XX:G1ReservePercent=20 ${CATALINA_OPTS}"
CATALINA_OPTS="-Djava.awt.headless=true ${CATALINA_OPTS}"
CATALINA_OPTS="-Datlassian.plugins.enable.wait=300 ${CATALINA_OPTS}"
CATALINA_OPTS="-Xms1024m -Xmx6144m -XX:+UseG1GC ${CATALINA_OPTS}"
CATALINA_OPTS="-Dsynchrony.enable.xhr.fallback=true ${CATALINA_OPTS}"
CATALINA_OPTS="-Dorg.apache.tomcat.websocket.DEFAULT_BUFFER_SIZE=32768 ${CATALINA_OPTS}"
CATALINA_OPTS="-Djava.locale.providers=JRE,SPI,CLDR ${CATALINA_OPTS}"
CATALINA_OPTS="${START_CONFLUENCE_JAVA_OPTS} ${CATALINA_OPTS}"
CATALINA_OPTS="-Dconfluence.context.path=${CONFLUENCE_CONTEXT_PATH} ${CATALINA_OPTS}"
CATALINA_OPTS="-Djdk.tls.server.protocols=TLSv1.1,TLSv1.2 -Djdk.tls.client.protocols=TLSv1.1,TLSv1.2 ${CATALINA_OPTS}"
CATALINA_OPTS="-XX:ReservedCodeCacheSize=256m -XX:+UseCodeCacheFlushing ${CATALINA_OPTS}"

export CATALINA_OPTS

# /atlas/atlassian/confluence/

Upped the memory to double from 8GB to 16GB and min Xms settings to 4096GB for faster startup and adjusted the following line accordingly:

CATALINA_OPTS="-Xms4g -Xmx14g -XX:+UseG1GC ${CATALINA_OPTS} -XX:MaxGCPauseMillis=100 -XX:+AlwaysPreTouch -XX:ParallelGCThreads=4 -XX:+UnlockExperimen talVMOptions -XX:ActiveProcessorCount=8 -XX:+DisableExplicitGC -XX:TargetSurvivorRatio=90 -XX:G1NewSizePercent=50 -XX:G1MaxNewSizePercent=80 -XX:G1 MixedGCLiveThresholdPercent=50"

Also added the following from the Minecraft Servers:

 

Cheers,
TK


     
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