rocketmq-connect

文档中心：RocketMQ Connect

架构简介：RocketMQ Connect 平台搭建与实践

快速开始

单机模式下rocketmq-connect-sample作为 demo

rocketmq-connect-sample的主要作用是从源文件中读取数据发送到RocketMQ集群 然后从Topic中读取消息，写入到目标文件

1.准备

1. Linux/Unix/Mac
2. 64bit JDK 1.8+;
3. Maven 3.2.x或以上版本;
4. 启动 RocketMQ;
5. 创建测试Topic sh ${ROCKETMQ_HOME}/bin/mqadmin updateTopic -t fileTopic -n localhost:9876 -c DefaultCluster -r 8 -w 8

tips : ${ROCKETMQ_HOME} 位置说明

bin-release.zip 版本：/rocketmq-all-4.9.4-bin-release

source-release.zip 版本：/rocketmq-all-4.9.4-source-release/distribution

2.构建Connect

git clone https://github.com/apache/rocketmq-connect.git

cd  rocketmq-connect

mvn -Prelease-connect -DskipTests clean install -U

3.运行Worker

cd distribution/target/rocketmq-connect-0.0.1-SNAPSHOT/rocketmq-connect-0.0.1-SNAPSHOT

sh bin/connect-standalone.sh -c conf/connect-standalone.conf &

tips: 可修改 /bin/runconnect.sh 适当调整 JVM Parameters Configuration

JAVA_OPT="${JAVA_OPT} -server -Xms256m -Xmx256m"

runtime启动成功：

The standalone worker boot success.

查看启动日志文件：

tail -100f ~/logs/rocketmqconnect/connect_runtime.log

ctrl + c 退出日志

4.启动source connector

当前目录创建测试文件 test-source-file.txt

touch test-source-file.txt

echo "Hello \r\nRocketMQ\r\n Connect" >> test-source-file.txt

curl -X POST -H "Content-Type: application/json" http://127.0.0.1:8082/connectors/fileSourceConnector -d '{"connector-class":"org.apache.rocketmq.connect.file.FileSourceConnector","filename":"test-source-file.txt","connect-topicname":"fileTopic"}'

看到以下日志说明 file source connector 启动成功了

tail -100f ~/logs/rocketmqconnect/connect_runtime.log

2019-07-16 11:18:39 INFO pool-7-thread-1 - Source task start, config:{“properties”:{"source-record-...

source connector配置说明

5.启动sink connector

curl -X POST -H "Content-Type: application/json" http://127.0.0.1:8082/connectors/fileSinkConnector -d '{"connector-class":"org.apache.rocketmq.connect.file.FileSinkConnector","filename":"test-sink-file.txt","connect-topicname":"fileTopic"}'

cat test-sink-file.txt

tail -100f ~/logs/rocketmqconnect/connect_runtime.log

看到以下日志说明file sink connector 启动成功了

2019-07-16 11:24:58 INFO pool-7-thread-2 - Sink task start, config:{“properties”:{"source-record-...

如果 test-sink-file.txt 生成并且与 source-file.txt 内容一样，说明整个流程正常运行。 文件内容可能顺序不一样，这主要是因为RocketMQ发到不同queue时，接收不同queue消息顺序可能也不一致导致的，是正常的。

sink connector配置说明

注：source/sink配置文件说明是以rocketmq-connect-sample为demo，不同source/sink connector配置有差异，请以具体sourc/sink connector 为准

6.停止connector

GET请求  
http://(your worker ip):(port)/connectors/(connector name)/stop

停止demo中的两个connector
curl     http://127.0.0.1:8082/connectors/fileSinkConnector/stop
curl     http://127.0.0.1:8082/connectors/fileSourceConnector/stop
    

看到以下日志说明connector停止成功了

Source task stop, config:{“properties”:{“source-record-converter”:“org.apache.rocketmq.connect.runtime.converter.JsonConverter”,“filename”:“/home/zhoubo/IdeaProjects/my-new3-rocketmq-externals/rocketmq-connect/rocketmq-connect-runtime/source-file.txt”,“task-class”:“org.apache.rocketmq.connect.file.FileSourceTask”,“topic”:“fileTopic”,“connector-class”:“org.apache.rocketmq.connect.file.FileSourceConnector”,“update-timestamp”:“1564765189322”}}

7.停止Worker进程

sh bin/connectshutdown.sh

8.日志目录

${user.home}/logs/rocketmqconnect

9.配置文件

持久化配置文件默认目录 /tmp/storeRoot

1. connectorConfig.json connector配置持久化文件
2. position.json source connect数据处理进度持久化文件
3. taskConfig.json task配置持久化文件
4. offset.json sink connect数据消费进度持久化文件

10.配置说明

可根据使用情况修改 RESTful 端口，storeRoot 路径，Nameserver 地址等信息

文件位置：work 启动目录下 conf/connect-standalone.conf

#current cluster node uniquely identifies
workerId=DEFAULT_WORKER_1

# Http prot for user to access REST API
httpPort=8082

# Local file dir for config store
storePathRootDir=/home/connect/storeRoot

#需要修改为自己的rocketmq nameserver 接入点
# RocketMQ namesrvAddr
namesrvAddr=127.0.0.1:9876  

#用于加载Connector插件，类似于jvm启动加载jar包或者class类，这里目录目录用于放Connector相关的实现插件，
支持文件和目录
# Source or sink connector jar file dir
pluginPaths=rocketmq-connect-sample/target/rocketmq-connect-sample-0.0.1-SNAPSHOT.jar

# 补充：将 Connector 相关实现插件保存到指定文件夹 
# pluginPaths=/usr/local/connector-plugins/*

11.其它restful接口

查看集群节点信息：

curl -X GET http://(your worker ip):(port)/getClusterInfo

查看集群中Connector和Task配置信息：

curl -X GET http://(your worker ip):(port)/getConfigInfo

查看当前节点分配Connector和Task配置信息：

curl -X GET http://(your worker ip):(port)/getAllocatedInfo

查看指定Connector配置信息：

curl -X GET http://(your worker ip):(port)/connectors/(connector name)/config

查看指定Connector状态：

curl -X GET http://(your worker ip):(port)/connectors/(connector name)/status

停止所有Connector：

curl -X GET http://(your worker ip):(port)/connectors/stopAll

重新加载Connector插件目录下的Connector包：

curl -X GET http://(your worker ip):(port)/plugin/reload

从内存删除Connector配置信息（谨慎使用）：

curl -X GET http://(your worker ip):(port)/connectors/(connector name)/delete

12.runtime配置参数说明

allocTaskStrategy说明

该参数默认可省略，这是一个可选参数，目前选项如下：

• 默认值

org.apache.rocketmq.connect.runtime.service.strategy.DefaultAllocateConnAndTaskStrategy

• 一致性Hash

org.apache.rocketmq.connect.runtime.service.strategy.AllocateConnAndTaskStrategyByConsistentHash

更多集群和负载均衡文档

负载均衡

13.runtime支持JVM参数说明

VirtualNode

一致性hash中虚拟节点数

consistentHashFunc

hash算法具体实现类,可以自己实现，在后续版本中会增加更多策略，该类应该实现

org.apache.rocketmq.common.consistenthash.HashFunction;

package org.apache.rocketmq.common.consistenthash;

public interface HashFunction {
    long hash(String var1);
}

默认情况下采用的是MD5Hash算法

//default hash function
private static class MD5Hash implements HashFunction {
    MessageDigest instance;

    public MD5Hash() {
        try {
            instance = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
        }
    }

    @Override
    public long hash(String key) {
        instance.reset();
        instance.update(key.getBytes());
        byte[] digest = instance.digest();

        long h = 0;
        for (int i = 0; i < 4; i++) {
            h <<= 8;
            h |= ((int) digest[i]) & 0xFF;
        }
        return h;
    }
}

##开发指南 如何在IDE中启动Connect Worker ?

###单机模式启动Connect Worker

Main Class配置 org.apache.rocketmq.connect.runtime.StandaloneConnectStartup

Program arguments配置

-c ${user path}/rocketmq-connect/distribution/conf/connect-standalone.conf

Environment variables配置

CONNECT_HOME=${user path}/rocketmq-connect/distribution

###集群模式启动Connect Worker

Main Class配置 org.apache.rocketmq.connect.runtime.DistributedConnectStartup

Program arguments配置

-c ${user path}/rocketmq-connect/distribution/conf/connect-distributed.conf

Environment variables配置

CONNECT_HOME=${user path}/rocketmq-connect/distribution