JDK8即將收費谚赎，所以需要升級jdk11（目前最新的是jdk12，但是沒有時間去研究）诱篷。
需要遷移的服務(wù)中大部分只要升級到最新的版本都可以支持JDK11壶唤。但是也有服務(wù)不可以的，
RocketMQ最新的是4.4.0版本棕所，至于安裝步驟我就不寫啦闸盔，網(wǎng)上一搜一大把，
但是當RocketMQ4.4.0遇到JDK11后卻出現(xiàn)了無法啟動nameserver的問題琳省。
原因就是RocketMQ仍然是按著JDK8的配置做為啟動的迎吵。
廢話少說盤他！针贬！
主要修改點如下(修改部分主要在注釋前后)：
vim runserver.sh
error_exit ()
{
echo "ERROR: $1 !!"
exit 1
}
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=$HOME/jdk/java
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=/usr/java
[ ! -e "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOME variable in your environment, We need java(x64)!"
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
export CLASSPATH=${BASE_DIR}/lib/rocketmq-namesrv-4.4.0.jar:${BASE_DIR}/lib/*:${BASE_DIR}/conf:${CLASSPATH}
#export CLASSPATH=.:${BASE_DIR}/conf:${CLASSPATH}
echo "$BASE_DIR"
echo "CLASSPATH:$CLASSPATH"
#===========================================================================================
# JVM Configuration
#===========================================================================================
#JAVA_OPT="${JAVA_OPT} -server -Xms4g -Xmx4g -Xmn2g -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn512m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=320m"
#JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 -XX:-UseParNewGC"
JAVA_OPT="${JAVA_OPT} -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8 "
JAVA_OPT="${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} -Djava.ext.dirs=${JAVA_HOME}/bin:${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}"
$JAVA ${JAVA_OPT} $@
主要有三點：內(nèi)存大小击费、java啟動配置、classpath桦他。
這樣啟動的時候就不會報如下錯誤啦
Error: Unable to initialize main class org.apache.rocketmq.namesrv.NamesrvStartup
Caused by: java.lang.NoClassDefFoundError: org/apache/rocketmq/srvutil/ShutdownHookThread
borker啟動文件修改
vim runbroker.sh
error_exit ()
{
echo "ERROR: $1 !!"
exit 1
}
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=$HOME/jdk/java
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=/usr/java
[ ! -e "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOME variable in your environment, We need java(x64)!"
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
#export CLASSPATH=.:${BASE_DIR}/conf:${CLASSPATH}
export CLASSPATH=${BASE_DIR}/lib/rocketmq-broker-4.4.0.jar:${BASE_DIR}/lib/*:${BASE_DIR}/conf:${CLASSPATH}
export CLASSPATH=${BASE_DIR}/lib/rocketmq-broker-4.4.0.jar:${BASE_DIR}/lib/*:${BASE_DIR}/conf/:.:${CLASSPATH}
#JAVA_OPT="${JAVA_OPT} -server -Xms8g -Xmx8g -Xmn4g"
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn512m"
JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0"
JAVA_OPT="${JAVA_OPT} -verbose:gc -Xloggc:/dev/shm/mq_gc_%p.log -XX:+PrintGCDetails"
#JAVA_OPT="${JAVA_OPT} -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5 -XX:GCLogFileSize=30m"
JAVA_OPT="${JAVA_OPT} -XX:-OmitStackTraceInFastThrow"
JAVA_OPT="${JAVA_OPT} -XX:+AlwaysPreTouch"
JAVA_OPT="${JAVA_OPT} -XX:MaxDirectMemorySize=15g"
JAVA_OPT="${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}"
numactl --interleave=all pwd > /dev/null 2>&1
if [ $? -eq 0 ]
then
if [ -z "$RMQ_NUMA_NODE" ] ; then
numactl --interleave=all $JAVA ${JAVA_OPT} $@
else
numactl --cpunodebind=$RMQ_NUMA_NODE --membind=$RMQ_NUMA_NODE $JAVA ${JAVA_OPT} $@
fi
else
$JAVA ${JAVA_OPT} $@
fi
主要修改點與nameserver配置文件的修改點相似蔫巩。
修改工具類腳本文件：
vim tools.sh
error_exit ()
{
echo "ERROR: $1 !!"
exit 1
}
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=$HOME/jdk/java
[ ! -e "$JAVA_HOME/bin/java" ] && JAVA_HOME=/usr/java
[ ! -e "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOME variable in your environment, We need java(x64)!"
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
export CLASSPATH=${BASE_DIR}/lib/*:${BASE_DIR}/conf:.:${CLASSPATH}
#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms1g -Xmx1g -Xmn256m -XX:PermSize=128m -XX:MaxPermSize=128m"
#JAVA_OPT="${JAVA_OPT} -Djava.ext.dirs=${BASE_DIR}/lib:${JAVA_HOME}/jre/lib/ext"
JAVA_OPT="${JAVA_OPT} -cp ${CLASSPATH}"
$JAVA ${JAVA_OPT} $@
