Offline data warehouse synchronization data 3

1) Flume configuration overview

Flume needs to transfer the data of the topic_db topic in Kafka to HDFS, so it needs to use KafkaSource and HDFSSink, and Channel uses FileChannel.
It should be noted that HDFSSink needs to write data from different mysql business tables to different paths, and the path should contain a layer of dates to distinguish daily data. The key configuration is as follows:

2) Flume configuration practice

（1）创建Flume配置文件
在hadoop104节点的Flume的job目录下创建kafka_to_hdfs_db.conf
[atguigu@hadoop104 flume]$ mkdir job
[atguigu@hadoop104 flume]$ vim job/kafka_to_hdfs_db.conf 
（2）配置文件内容如下
a1.sources = r1
a1.channels = c1
a1.sinks = k1

a1.sources.r1.type = org.apache.flume.source.kafka.KafkaSource
a1.sources.r1.batchSize = 5000
a1.sources.r1.batchDurationMillis = 2000
a1.sources.r1.kafka.bootstrap.servers = hadoop102:9092,hadoop103:9092
a1.sources.r1.kafka.topics = topic_db
a1.sources.r1.kafka.consumer.group.id = flume
a1.sources.r1.setTopicHeader = true
a1.sources.r1.topicHeader = topic
a1.sources.r1.interceptors = i1
a1.sources.r1.interceptors.i1.type = com.atguigu.gmall.flume.interceptor.TimestampAndTableNameInterceptor$Builder

a1.channels.c1.type = file
a1.channels.c1.checkpointDir = /opt/module/flume/checkpoint/behavior2
a1.channels.c1.dataDirs = /opt/module/flume/data/behavior2/
a1.channels.c1.maxFileSize = 2146435071
a1.channels.c1.capacity = 1000000
a1.channels.c1.keep-alive = 6

## sink1
a1.sinks.k1.type = hdfs
a1.sinks.k1.hdfs.path = /origin_data/gmall/db/%{
    
    tableName}_inc/%Y-%m-%d
a1.sinks.k1.hdfs.filePrefix = db
a1.sinks.k1.hdfs.round = false


a1.sinks.k1.hdfs.rollInterval = 10
a1.sinks.k1.hdfs.rollSize = 134217728
a1.sinks.k1.hdfs.rollCount = 0


a1.sinks.k1.hdfs.fileType = CompressedStream
a1.sinks.k1.hdfs.codeC = gzip

## 拼装
a1.sources.r1.channels = c1
a1.sinks.k1.channel= c1

（3）编写Flume拦截器
新建一个Maven项目，并在pom.xml文件中加入如下配置
<dependencies>
    <dependency>
        <groupId>org.apache.flume</groupId>
        <artifactId>flume-ng-core</artifactId>
        <version>1.9.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.62</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.3.2</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>
        </plugin>
        <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <configuration>
                <descriptorRefs>
                    <descriptorRef>jar-with-dependencies</descriptorRef>
                </descriptorRefs>
            </configuration>
            <executions>
                <execution>
                    <id>make-assembly</id>
                    <phase>package</phase>
                    <goals>
                        <goal>single</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

在com.atguigu.gmall.flume.interceptor包下创建TimestampAndTableNameInterceptor类
package com.atguigu.gmall.flume.interceptor;
import com.alibaba.fastjson.JSONObject;
import org.apache.flume.Context;
import org.apache.flume.Event;
import org.apache.flume.interceptor.Interceptor;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;
public class TimestampAndTableNameInterceptor implements Interceptor {
    
    
    @Override
    public void initialize() {
    
    
    }
    @Override
    public Event intercept(Event event) {
    
    
        Map<String, String> headers = event.getHeaders();
String log = new String(event.getBody(), StandardCharsets.UTF_8);

 		JSONObject jsonObject = JSONObject.parseObject(log);

 		Long ts = jsonObject.getLong("ts");
 		//Maxwell输出的数据中的ts字段时间戳单位为秒，Flume HDFSSink要求单位为毫秒
 		String timeMills = String.valueOf(ts * 1000);

 		String tableName = jsonObject.getString("table");

 		headers.put("timestamp", timeMills);
 		headers.put("tableName", tableName);
		return event;
    }

    @Override
    public List<Event> intercept(List<Event> events) {
    
    

        for (Event event : events) {
    
    
            intercept(event);
        }
        return events;
    }

    @Override
    public void close() {
    
    
    }

    public static class Builder implements Interceptor.Builder {
    
    
        @Override
        public Interceptor build() {
    
    
            return new TimestampAndTableNameInterceptor ();
        }

        @Override
        public void configure(Context context) {
    
    

        }
    }
}






重新打包
将打好的包放入到hadoop104的/opt/module/flume/lib文件夹下
[atguigu@hadoop102 lib]$ ls | grep interceptor
flume-interceptor-1.0-SNAPSHOT-jar-with-dependencies.jar

3) Channel test

（1）启动Zookeeper、Kafka集群
（2）启动hadoop104的Flume
[atguigu@hadoop104 flume]$ bin/flume-ng agent -n a1 -c conf/ -f job/kafka_to_hdfs_db.conf -Dflume.root.logger=info,console
（3）生成模拟数据
[atguigu@hadoop102 bin]$ cd /opt/module/db_log/
[atguigu@hadoop102 db_log]$ java -jar gmall2020-mock-db-2021-11-14.jar 
（4）观察HDFS上的目标路径是否有数据出现
若HDFS上的目标路径已有增量表的数据出现了，就证明数据通道已经打通。
（5）数据目标路径的日期说明
仔细观察，会发现目标路径中的日期，并非模拟数据的业务日期，而是当前日期。这是由于Maxwell输出的JSON字符串中的ts字段的值，是数据的变动日期。而真实场景下，数据的业务日期与变动日期应当是一致的。

4) Write Flume start and stop scripts

为方便使用，此处编写一个Flume的启停脚本
（1）在hadoop102节点的/home/atguigu/bin目录下创建脚本f3.sh
[atguigu@hadoop102 bin]$ vim f3.sh
	在脚本中填写如下内容
#!/bin/bash

case $1 in
"start")
        echo " --------启动 hadoop104 业务数据flume-------"
        ssh hadoop104 "nohup /opt/module/flume/bin/flume-ng agent -n a1 -c /opt/module/flume/conf -f /opt/module/flume/job/kafka_to_hdfs_db.conf >/dev/null 2>&1 &"
;;
"stop")

        echo " --------停止 hadoop104 业务数据flume-------"
        ssh hadoop104 "ps -ef | grep kafka_to_hdfs_db | grep -v grep |awk '{print \$2}' | xargs -n1 kill"
;;
esac
（2）增加脚本执行权限
[atguigu@hadoop102 bin]$ chmod 777 f3.sh
（3）f3启动
[atguigu@hadoop102 module]$ f3.sh start
（4）f3停止
[atguigu@hadoop102 module]$ f3.sh stop

2.2.6.3 Maxwell配置
1）Maxwell时间戳问题

此处为了模拟真实环境，对Maxwell源码进行了改动，增加了一个参数mock_date，该参数的作用就是指定Maxwell输出JSON字符串的ts时间戳的日期，接下来进行测试。
修改Maxwell配置文件config.properties，增加mock_date参数，如下
log_level=info

producer=kafka
kafka.bootstrap.servers=hadoop102:9092,hadoop103:9092

#kafka topic配置
kafka_topic=topic_db

#注：该参数仅在maxwell教学版中存在，修改该参数后重启Maxwell才可生效
mock_date=2020-06-14

# mysql login info
host=hadoop102
user=maxwell
password=maxwell
jdbc_options=useSSL=false&serverTimezone=Asia/Shanghai
注：该参数仅供学习使用，修改该参数后重启Maxwell才可生效。
重启Maxwell
[atguigu@hadoop102 bin]$ mxw.sh restart
重新生成模拟数据
[atguigu@hadoop102 bin]$ cd /opt/module/db_log/
[atguigu@hadoop102 db_log]$ java -jar gmall2020-mock-db-2021-11-14.jar 
观察HDFS目标路径日期是否正常

2.2.6.4 Full synchronization of the incremental table on the first day

通常情况下，增量表需要在首日进行一次全量同步，后续每日再进行增量同步，首日全量同步可以使用Maxwell的bootstrap功能，方便起见，下面编写一个增量表首日全量同步脚本。
1）在~/bin目录创建mysql_to_kafka_inc_init.sh
[atguigu@hadoop102 bin]$ vim mysql_to_kafka_inc_init.sh
脚本内容如下
#!/bin/bash

# 该脚本的作用是初始化所有的增量表，只需执行一次

MAXWELL_HOME=/opt/module/maxwell

import_data() {
    
    
    $MAXWELL_HOME/bin/maxwell-bootstrap --database gmall --table $1 --config $MAXWELL_HOME/config.properties
}

case $1 in
"cart_info")
  import_data cart_info
  ;;
"comment_info")
  import_data comment_info
  ;;
"coupon_use")
  import_data coupon_use
  ;;
"favor_info")
  import_data favor_info
  ;;
"order_detail")
  import_data order_detail
  ;;
"order_detail_activity")
  import_data order_detail_activity
  ;;
"order_detail_coupon")
  import_data order_detail_coupon
  ;;
"order_info")
  import_data order_info
  ;;
"order_refund_info")
  import_data order_refund_info
  ;;
"order_status_log")
  import_data order_status_log
  ;;
"payment_info")
  import_data payment_info
  ;;
"refund_payment")
  import_data refund_payment
  ;;
"user_info")
  import_data user_info
  ;;
"all")
  import_data cart_info
  import_data comment_info
  import_data coupon_use
  import_data favor_info
  import_data order_detail
  import_data order_detail_activity
  import_data order_detail_coupon
  import_data order_info
  import_data order_refund_info
  import_data order_status_log
  import_data payment_info
  import_data refund_payment
  import_data user_info
  ;;
esac
2）为mysql_to_kafka_inc_init.sh增加执行权限
[atguigu@hadoop102 bin]$ chmod 777 ~/bin/mysql_to_kafka_inc_init.sh

3) Test synchronization script
(1) Clean historical data
. To facilitate viewing the results, delete the previously synchronized incremental table data on HDFS
[atguigu@hadoop102 ~]$ hadoop fs -ls /origin_data/gmall/db | grep _inc | awk '{print KaTeX parse error: Expected 'EOF', got '}' at position 2: 8}̲' | xargs hadoo… mysql_to_kafka_inc_init.sh all
4) Check the synchronization results
and observe whether the incremental table data reappears on HDFS.

2.3 采集通道启动/停止脚本
1）在/home/atguigu/bin目录下创建脚本cluster.sh
[atguigu@hadoop102 bin]$ vim cluster.sh
	在脚本中填写如下内容
#!/bin/bash

case $1 in
"start"){
    
    
        echo ================== 启动 集群 ==================

        #启动 Zookeeper集群
        zk.sh start

        #启动 Hadoop集群
        hdp.sh start

        #启动 Kafka采集集群
        kf.sh start

        #启动采集 Flume
        f1.sh start

#启动日志消费 Flume
        f2.sh start

#启动业务消费 Flume
        f3.sh start

#启动 maxwell
        mxw.sh start

        };;
"stop"){
    
    
        echo ================== 停止 集群 ==================

#停止 Maxwell
        mxw.sh stop

#停止 业务消费Flume
        f3.sh stop

#停止 日志消费Flume
        f2.sh stop

#停止 日志采集Flume
        f1.sh stop

        #停止 Kafka采集集群
        kf.sh stop

        #停止 Hadoop集群
        hdp.sh stop

        #停止 Zookeeper集群
        zk.sh stop

};;
esac


2）增加脚本执行权限
[atguigu@hadoop102 bin]$ chmod 777 cluster.sh
3）cluster集群启动脚本
[atguigu@hadoop102 module]$ cluster.sh start
4）cluster集群停止脚本
[atguigu@hadoop102 module]$ cluster.sh stop