Flink Sql教程（1）

环境准备

安装Docker及相关镜像

Docker下载链接由于穷买不起mac，所以挂的windows的链接，可自行去Docker官网下载其他版本。
安装过程省略，毕竟一路下一步的东西，下面开始安装并启动kafka、mysql等服务。

安装zookeeper服务

因为kafka需要将许多信息固化存储在zk上，所以我们首先得安装zookeeper服务

执行docker run -d --name zookeeper --publish 2181:2181 wurstmeister/zookeeper，这里将2181端口绑定到本地，之后kafka才能连上zk。这样，我们的zk就安装完毕，接下来我们开始验证是否正确启动。
本地执行docker ps -a，能看到如下所示:

PS C:\Users\tzmaj> docker ps -a
CONTAINER ID        IMAGE                    COMMAND                  CREATED             STATUS              PORTS                                                NAMES
2b8cd369aa3e        wurstmeister/zookeeper   "/bin/sh -c '/usr/sb…"   3 seconds ago       Up 2 seconds        22/tcp, 2888/tcp, 3888/tcp, 0.0.0.0:2181>2181/tcp   zookeeper

第一个值是容器id，现在我们把这个id拷出来，执行docker exec -it 1bf952a747ef '/bin/bash'，这样我们就进入到了容器里面。接下来进入/opt/zookeeper-3.4.13/bin目录，执行./zkCli.sh，进入zk的客户端

root@2b8cd369aa3e:/opt/zookeeper-3.4.13/bin# ./zkCli.sh
Connecting to localhost:2181
2020-04-28 08:13:40,238 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.13-2d71af4dbe22557fda74f9a9b4309b15a7487f03, built on 06/29/2018 04:05 GMT
2020-04-28 08:13:40,241 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=2b8cd369aa3e
2020-04-28 08:13:40,241 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0_65
2020-04-28 08:13:40,243 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2020-04-28 08:13:40,243 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-7-openjdk-amd64/jre
2020-04-28 08:13:40,243 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/zookeeper-3.4.13/bin/../build/classes:/opt/zookeeper-3.4.13/bin/../build/lib/*.jar:/opt/zookeeper-3.4.13/bin/../lib/slf4j-log4j12-1.7.25.jar:/opt/zookeeper-3.4.13/bin/../lib/slf4j-api-1.7.25.jar:/opt/zookeeper-3.4.13/bin/../lib/netty-3.10.6.Final.jar:/opt/zookeeper-3.4.13/bin/../lib/log4j-1.2.17.jar:/opt/zookeeper-3.4.13/bin/../lib/jline-0.9.94.jar:/opt/zookeeper-3.4.13/bin/../lib/audience-annotations-0.5.0.jar:/opt/zookeeper-3.4.13/bin/../zookeeper-3.4.13.jar:/opt/zookeeper-3.4.13/bin/../src/java/lib/*.jar:/opt/zookeeper-3.4.13/bin/../conf:
2020-04-28 08:13:40,243 [myid:] - INFO  [main:Environment@100] - Client   environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=4.19.76-linuxkit
2020-04-28 08:13:40,244 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2020-04-28 08:13:40,245 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2020-04-28 08:13:40,245 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/opt/zookeeper-3.4.13/bin
2020-04-28 08:13:40,246 [myid:] - INFO  [main:ZooKeeper@442] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@674e5e21
Welcome to ZooKeeper!
2020-04-28 08:13:40,268 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1029] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
2020-04-28 08:13:40,278 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@879] - Socket connection established to localhost/127.0.0.1:2181, initiating session
JLine support is enabled
2020-04-28 08:13:40,300 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1303] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x100005e85070000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]

接下来再执行ls /

[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]

看来我们的zk应该装的没什么问题，那么一路ctrl+d退到最外面

如果在执行docker ps -a发现STATUS那一列显示EXIT，那说明有问题，使用docker logs CONTAINER ID查看具体日志
也可以使用类似于ZooInspector或者JAVA客户端等其他方式去连接zk，来验证zk服务是否正确启动

安装kafka服务

执行docker run -d --name kafka -p 9092:9092 -e KAFKA_BROKER_ID=0 -e KAFKA_ZOOKEEPER_CONNECT=172.17.47.44:2181 -e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://172.17.47.44:9092 -e KAFKA_LISTENERS=PLAINTEXT://0.0.0.0:9092 -t wurstmeister/kafka:2.11-0.11.0.3注意：此处的172.17.47.44是我本地的ip，大家在抄作业的时候，记得写上自己的名字。接下来我们开始验证kafka能否正常使用。
执行docker ps -a找到kafka的容器id，然后执行docker exec -it e51c12e9a077 '/bin/bash'，这样我们进入了kafka的容器里。接下来进入kafka客户端的目录/opt/kafka/bin，执行kafka-console-producer.sh --broker-list 172.17.47.44:9092 --topic mykafka，进入kafka生产者客户端。
再启动一个命令行，同样进入kafka客户端目录，然后执行kafka-console-consumer.sh --bootstrap-server 172.17.47.44:9092 --topic mykafka --from-beginning，这样进入kafka消费者客户端。
切回kafka生产者客户端窗口，输入我们准备好的JSON数据{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}，此时，观察kafka消费者客户端窗口，能看到一条数据被打印出来。如下所示：

PS C:\Users\tzmaj> docker exec -it 7a58196af291 '/bin/bash'
bash-4.4# cd /opt/kafka/bin
bash-4.4# kafka-console-producer.sh --broker-list 172.17.47.44:9092 --topic mykafka
>{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
>{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
>{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
>{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}

PS C:\Users\tzmaj> docker exec -it 7a58196af291 '/bin/bash'
bash-4.4# cd /opt/kafka/bin/
bash-4.4# kafka-console-consumer.sh --bootstrap-server 172.17.47.44:9092 --topic mykafka --from-beginning
{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
{"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}
^CProcessed a total of 4 messages

第一段是生产者，第二段是消费者，看样子我们能够正确的消费和生产数据。NICE！下面用JAVA测试一下能否正常消费

      Properties properties = new Properties();
      properties.put("bootstrap.servers", "172.17.47.44.:9092");
      properties.put("group.id", "test1");
      properties.put("auto.offset.reset", "earliest");
      properties.put("key.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");
      properties.put("value.deserializer", "org.apache.kafka.common.serialization.StringDeserializer");

      KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);
      kafkaConsumer.subscribe(Arrays.asList("mykafka"));
      while (true) {
          ConsumerRecords<String, String> records = kafkaConsumer.poll(100);
          for (ConsumerRecord<String, String> record : records) {
              System.out.printf(" value is =>>> %s", record.value());
          }
      }

启动，然后观察控制台

value is =>>> {"user_id": "543462", "item_id":"1715", "category_id": "1464116", "behavior": "pv", "ts": "2017-11-26T01:00:00Z"}

能够正常消费，我们的kafka客户端也没问题

安装mysql服务
- 执行docker run --name mysql -e MYSQL_ROOT_PASSWORD=123456 -d -p 3306:3306 mysql:5.6命令，此处的MYSQL_ROOT_PASSWORD=123456是将root密码设置为123456，大家可以根据个人喜爱自己修改
- 使用Navicat连接我们的mysql
  
  主机和端口分别就是我们的ip和设置的端口3306，密码就是上一步提到的MYSQL_ROOT_PASSWORD，测试连接
  
  连接成功！接下来连入我们的mysql，并执行select CURRENT_TIMESTAMP() from dual，返回2020-04-28 07:38:48，看样子我们的mysql也没什么问题。
最后，数据下载地址 UserBehavior.csv
好了，我们Flink Sql教程系列第一课环境准备完成了，接下来开始正式进入Flink Sql的学习之旅。

环境准备

安装Docker及相关镜像

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