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I am writing a java api (reporting Api )that is exports a huge data from elastic search, I was test the code but I found many spikes in the Gc activities I need recommendations to tune the jvm params and the Gc prams

-verbose:gc -Xloggc:/opt/jboss/standalone/log/gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=3M -XX:-TraceClassUnloading -server -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:NewRatio=2 -Djava.net.preferIPv4Stack=true -Duser.timezone=GMT -XX:+CMSClassUnloadingEnabled -XX:+CMSParallelRemarkEnabled -XX:+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSClassUnloadingEnabled -XX:+ExplicitGCInvokesConcurrentAndUnloadsClasses -XX:+ScavengeBeforeFullGC -XX:+CMSScavengeBeforeRemark -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true -Dfile.encoding=UTF-8 -Dfile.io.encoding=UTF-8 -DjavaEncoding=UTF-8 -Xms2300m -Xmx2300m -XX:MaxMetaspaceSize=512m -XX:MetaspaceSize=256m -Dspring.profiles.active=loadtest -Dhttps.proxyHost=proxy.payfort.com -Dhttps.proxyPort=80 -Dhttp.proxyHost=proxy.payfort. Dorg.jboss.boot.log.file=/opt/jboss/standalone/log/server.log -Dlogging.configuration=file:/opt/jboss/standalone/configuration/logging.properties -jar /opt/jboss/jboss-modules.jar -mp /opt/jboss/modules org.jboss.as.standalone -Djboss.home.dir=/opt/jboss -Djboss.server.base.dir=/opt/jboss/standalone -c standalone.xml

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  • Which Java version you are using? Are you settings any GC flags? Graph looks normal that is how GC is designed
    – Fairoz
    Commented Jul 13, 2017 at 17:32
  • I am using java 8 , no gc flags
    – Osama Abu Qauod
    Commented Jul 13, 2017 at 21:42
  • Please provide query examples and used endpoints, index size and schema. Usually the problem is in incorrect api usage. In most cases it is enough to increase heap size
    – Ivan Mamontov
    Commented Jul 14, 2017 at 13:42
  • Also note that ES is information retrieval engine - this means it fast in case of search but not optimal in data extracting. Without technical details it is hard to provide any useful advise.
    – Ivan Mamontov
    Commented Jul 14, 2017 at 13:51
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