rocketMq介绍

RocketMQ是阿里巴巴中间件团队自研的一款高性能、高吞吐量、低延迟、高可用、高可靠（具备金融级稳定性）的分布式消息中间件，开源后并于2016年捐赠给Apache社区孵化，目前已经成为了Apache顶级项目。当前在国内被广泛的使用，包括互联网、电商、金融、企业服务等领域，包括：字节跳动、滴滴、微众银行等知名的互联网公司。

https://github.com/apache/rocketmq

RocketMQ的使用场景

应用解耦

系统的耦合性越高，容错性就越低。以电商应用为例，用户创建订单后，如果耦合调用库存系统、
物流系统、支付系统，任何一个子系统出了故障或者因为升级等原因暂时不可用，都会造成下单操作异
常，影响用户使用体验。

流量削峰

应用系统如果遇到系统请求流量的瞬间猛增，有可能会将系统压垮。有了消息队列可以将大量请求缓存起来，分散到很长一段时间处理，这样可以大大提到系统的稳定性和用户体验。

举例:业务系统正常时段的QPS如果是1000，流量最高峰是10000，为了应对流量高峰配置高性能的服务器显然不划算，这时可以使用消息队列对峰值流量削峰

数据分发

通过消息队列可以让数据在多个系统之间进行流通。数据的产生方不需要关心谁来使用数据，只需要将数据发送到消息队列，数据使用方直接在消息队列中直接获取数据即可

安装rocketMq

下载地址 http://rocketmq.apache.org/dowloading/releases/

我这里下载4.7、以及使用 jdk11版本

rocketMq的相关配置比如 jvm参数和内存配置都是默认基于jdk8环境。

因为jdk中一些垃圾回收器在JDK11中已经被剔除了，如果启动会报下面错误提示。

对于下面配置中的堆最小值，堆最大值和新生代大小，根据自己需求设置（-Xms256m -Xmx256m -Xmn256m），用于测试使用，如果是生产环境大家可以根据需求调大。

如果想要在jdk11环境上搭建rocketMq，需要将下面的几个文件内容进行替换。

runserver.sh修改

#!/bin/sh
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#===========================================================================================
# Java Environment Setting
#===========================================================================================
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 "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOMEvariable in your environment, We need java(x64)!"
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..
export CLASSPATH=.:${BASE_DIR}/conf:${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib/*
#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn128m -XX:MetaspaceSize=64m -XX:MaxMetaspaceSize=160m"
JAVA_OPT="${JAVA_OPT} -XX:CMSInitiatingOccupancyFraction=70 -XX:+CMSParallelRemarkEnabled -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+CMSClassUnloadingEnabled -XX:SurvivorRatio=8"
# mq 日志 文件自己设置 -Xlog 自己的
JAVA_OPT="${JAVA_OPT} -verbose:gc -Xlog:gc:/Users/pilgrim/训练营/阶段6/模块3/rocketMQ/rocketmq-all-4.7.1-bin-release/log/rmq_srv_gc.log -XX:+PrintGCDetails"
JAVA_OPT="${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}"
$JAVA ${JAVA_OPT} $@

runbroker.sh修改

 #!/bin/sh
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#===========================================================================================
# Java Environment Setting
#===========================================================================================
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 "$JAVA_HOME/bin/java" ] && error_exit "Please set the JAVA_HOMEvariable in your environment, We need java(x64)!"
export JAVA_HOME
export JAVA="$JAVA_HOME/bin/java"
export BASE_DIR=$(dirname $0)/..



export CLASSPATH=.${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib/*:${BASE_DIR}/conf:${CLASSPATH}
#export CLASSPATH=${BASE_DIR}/lib/rocketmq-broker-4.5.0.jar:${BASE_DIR}/lib/*:${BASE_DIR}/conf:${CLASSPATH}

#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn128m"
JAVA_OPT="${JAVA_OPT} -XX:+UseG1GC -XX:G1HeapRegionSize=16m -XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30 -XX:SoftRefLRUPolicyMSPerMB=0"
JAVA_OPT="${JAVA_OPT} -verbose:gc -Xlog:gc:/dev/shm/mq_gc_%p.log -XX:+PrintGCDetails"
JAVA_OPT="${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} -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} --add-exports=java.base/jdk.internal.ref=ALL-UNNAMED $@
fi

tools.sh修改

#!/bin/sh

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

#===========================================================================================
# Java Environment Setting
#===========================================================================================
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}
export CLASSPATH=.${JAVA_HOME}/jre/lib/ext:${BASE_DIR}/lib/*:${BASE_DIR}/conf:${CLASSPATH}
#export CLASSPATH=.:${BASE_DIR}/conf:${CLASSPATH}
#echo "BASE_DIR:$BASE_DIR"
#echo "CLASSPATH:$CLASSPATH"

#===========================================================================================
# JVM Configuration
#===========================================================================================
JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m -Xmn256m -XX:PermSize=128m-XX:MaxPermSize=128m"
JAVA_OPT="${JAVA_OPT} -cp ${CLASSPATH}"

$JAVA ${JAVA_OPT} $@

bin目录下

修改完之后启动 namesrv

sh ./mqnamesrv  或  后台启动 nohup sh ./mqnamesrv & 

启动 mqbroker

nohup sh ./mqbroker -n localhost:9876 &

停止命令

sh ./mqshutdown broker
sh ./mqshutdown namesrv