huanwei opened a new pull request #393: Polish the default JVM options for namesrv and broker URL: https://github.com/apache/rocketmq/pull/393 ## What is the purpose of the change 1) The goal of this PR is to dynamically calculate proper JVM heap available for RocketMQ namesrv and broker, and set them in JVM options when they get started. It is derived from the community project apache/rocketmq-externals [PR #89](https://github.com/apache/rocketmq-externals/pull/89), which aims to run Rocketmq in Docker daemon environments. 2) Due to the default JVM heap demands of the RocketMQ namesrv and broker, user in community raised issue like [Issue #78](https://github.com/apache/rocketmq-externals/issues/78). This PR also aims to solve this kind of issue from upstream. ## Brief changelog In this PR, we use gawk to calculate the max possible heap used by a JVM, and set JVM options for namesrv and broker. For example, in `${ROCKETMQ_HOME}/bin/runserver.sh`, we add the following changes: ``` #=========================================================================================== # JVM Configuration #=========================================================================================== # Get the max heap used by a jvm, which used all the ram available to the container. MAX_POSSIBLE_HEAP=$(java -XX:+UnlockExperimentalVMOptions -XX:MaxRAMFraction=1 -XshowSettings:vm -version |& awk '/Max\. Heap Size \(Estimated\): [0-9KMG]+/{ print $5}' | gawk -f to_bytes.gawk) # Dynamically calculate parameters, for reference. Xms=$[MAX_POSSIBLE_HEAP/4] Xmx=$[MAX_POSSIBLE_HEAP/4] Xmn=$[MAX_POSSIBLE_HEAP/8] # Set for `JAVA_OPT`. JAVA_OPT="${JAVA_OPT} -server -Xms${Xms} -Xmx${Xmx} -Xmn${Xmn}" JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC" JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:/dev/shm/rmq_srv_gc.log -XX:+PrintGCDetails" JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow" JAVA_OPT="${JAVA_OPT} -XX:-UseLargePages" JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib" #JAVA_OPT="${JAVA_OPT} -Xdebug -Xrunjdwp:transport=dt_socket,address=9555,server=y,suspend=n" JAVA_OPT="${JAVA_OPT} ${JAVA_OPT_EXT}" JAVA_OPT="${JAVA_OPT} -cp ${CLASSPATH}" ``` And in `${ROCKETMQ_HOME}/bin/runbroker.sh`, we add the following changes: ``` #=========================================================================================== # JVM Configuration #=========================================================================================== # Get the max heap used by a jvm, which used all the ram available to the container. MAX_POSSIBLE_HEAP=$(java -XX:+UnlockExperimentalVMOptions -XX:MaxRAMFraction=1 -XshowSettings:vm -version |& awk '/Max\. Heap Size \(Estimated\): [0-9KMG]+/{ print $5}' | gawk -f to_bytes.gawk) # Dynamically calculate parameters, for reference. Xms=$[MAX_POSSIBLE_HEAP/4] Xmx=$[MAX_POSSIBLE_HEAP/4] Xmn=$[MAX_POSSIBLE_HEAP/8] MaxDirectMemorySize=$[MAX_POSSIBLE_HEAP/4] # Set for `JAVA_OPT`. JAVA_OPT="${JAVA_OPT} -server -Xms${Xms} -Xmx${Xmx} -Xmn${Xmn}" JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0 -XX:SurvivorRatio=8" JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:/dev/shm/mq_gc_%p.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime -XX:+PrintAdaptiveSizePolicy" JAVA_OPT="${JAVA_OPT} -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m" JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow" JAVA_OPT="${JAVA_OPT} -XX:+AlwaysPreTouch" JAVA_OPT="${JAVA_OPT} -XX:MaxDirectMemorySize=${MaxDirectMemorySize}" JAVA_OPT="${JAVA_OPT} -XX:-UseLargePages -XX:-UseBiasedLocking" JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib" #JAVA_OPT="${JAVA_OPT} -Xdebug -Xrunjdwp:transport=dt_socket,address=9555,server=y,suspend=n" JAVA_OPT="${JAVA_OPT} ${JAVA_OPT_EXT}" JAVA_OPT="${JAVA_OPT} -cp ${CLASSPATH}" ``` ## Verifying this change The changes have been verified in Docker environment based on CentOS 7. So it should be compatible with any VM or bare-metal environments based on CentOS 7. Details can be found in apache/rocketmq-externals [PR #89](https://github.com/apache/rocketmq-externals/pull/89). Follow this checklist to help us incorporate your contribution quickly and easily. Notice, `it would be helpful if you could finish the following 5 checklist(the last one is not necessary)before request the community to review your PR`. - [x] Make sure there is a [Github issue](https://github.com/apache/rocketmq/issues) filed for the change (usually before you start working on it). Trivial changes like typos do not require a Github issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue. - [x] Format the pull request title like `[ISSUE #123] Fix UnknownException when host config not exist`. Each commit in the pull request should have a meaningful subject line and body. - [x] Write a pull request description that is detailed enough to understand what the pull request does, how, and why. - [x] Write necessary unit-test(over 80% coverage) to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add integration-test in [test module](https://github.com/apache/rocketmq/tree/master/test). - [x] Run `mvn -B clean apache-rat:check findbugs:findbugs checkstyle:checkstyle` to make sure basic checks pass. Run `mvn clean install -DskipITs` to make sure unit-test pass. Run `mvn clean test-compile failsafe:integration-test` to make sure integration-test pass. - [x ] If this contribution is large, please file an [Apache Individual Contributor License Agreement](http://www.apache.org/licenses/#clas).
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