发布时间：2025-06-24 18:19:15 作者：北方职教升学中心 阅读量：395
版本说明
Flink和kafka的版本号有一定的匹配关系，操作成功的版本：
- Flink1.17.1
- kafka_2.12-3.3.1
添加kafka连接器依赖
将flink-sql-connector-kafka-1.17.1.jar上传到flink的lib目录下
下载flink-sql-connector-kafka连接器jar包
https://mvnrepository.com/artifact/org.apache.flink/flink-connector-kafka/1.17.1
上传到flink的lib目录下
[hadoop@node2 ~]$ cp flink-connector-kafka-1.17.1.jar $FLINK_HOME/lib
分发flink-connector-kafka-1.17.1.jar
xsync $FLINK_HOME/lib/flink-connector-kafka-1.17.1.jar
启动yarn-session
[hadoop@node2 ~]$ myhadoop.sh start[hadoop@node2 ~]$ yarn-session.sh -d
启动kafka集群
[hadoop@node2 ~]$ zk.sh start[hadoop@node2 ~]$ kf.sh start
创建kafka主题
查看主题[hadoop@node2 ~]$ kafka-topics.sh --bootstrap-server node2:9092,node3:9092,node4:9092 --list如果没有ws1,则创建[hadoop@node2 ~]$ kafka-topics.sh --bootstrap-server node2:9092,node3:9092,node4:9092 --create --replication-factor 1 --partitions 1 --topic ws1
普通Kafka表
'connector' = 'kafka'
进入Flink SQL客户端
[hadoop@node2 ~]$ sql-client.sh embedded -s yarn-session...省略若干日志输出...Flink SQL>
创建Kafka的映射表
CREATE TABLE t1( `event_time` TIMESTAMP(3) METADATA FROM 'timestamp', --列名和元数据名一致可以省略 FROM 'xxxx', VIRTUAL表示只读 `partition` BIGINT METADATA VIRTUAL, `offset` BIGINT METADATA VIRTUAL,id int, ts bigint , vc int )WITH ( 'connector' = 'kafka', 'properties.bootstrap.servers' = 'node2:9092,node3:9092,node4:9094', 'properties.group.id' = 'test',-- 'earliest-offset', 'latest-offset', 'group-offsets', 'timestamp' and 'specific-offsets' 'scan.startup.mode' = 'earliest-offset', -- fixed为flink实现的分区器，一个并行度只写往kafka一个分区'sink.partitioner' = 'fixed', 'topic' = 'ws1', 'format' = 'json');可以往kafka读数据，也可以往kafka写数据。
创建upsert-kafka的映射表(必须定义主键)
CREATE TABLE t2( id int , sumVC int , primary key (id) NOT ENFORCED )WITH ( 'connector' = 'upsert-kafka', 'properties.bootstrap.servers' = 'node2:9092', 'topic' = 'ws2', 'key.format' = 'json', 'value.format' = 'json');如果没有kafka名为ws2的topic，将自动被创建。
插入upsert-kafka表
insert into t2 select id,sum(vc) sumVC from source group by id;查询upsert-kafka表
upsert-kafka 无法从指定的偏移量读取，只会从主题的源读取。
设置显示模式
SET sql-client.execution.result-mode=tableau;查询t2表数据
select * from t2;如果发现没有输出数据，原因是之前的source表已经生成到end（1000000）就不再生成数据了。如此，才知道整个数据的更新过程。并且通过 -U，+U，+I 等符号来显示数据的变化过程。
CREATE TABLE source ( id INT, ts BIGINT, vc INT) WITH ( 'connector' = 'datagen', 'rows-per-second'='1', 'fields.id.kind'='random', 'fields.id.min'='1', 'fields.id.max'='10', 'fields.ts.kind'='sequence', 'fields.ts.start'='1', 'fields.ts.end'='1000000', 'fields.vc.kind'='random', 'fields.vc.min'='1', 'fields.vc.max'='100');把source表插入t1表
insert into t1(id,ts,vc) select * from source;如果报错
[ERROR] Could not execute SQL statement. Reason:java.lang.ClassNotFoundException: org.apache.kafka.common.serialization.ByteArraySerializer
依然同样错误，还不行，把kafka libs目录下的kafka-clients-3.3.1.jar，把jar包发到Flink的lib目录，同时也注意重启sql-client、
插入数据到Kafka表
如果没有source表，先创建source表，如果source表存在则不需要再创建。yarn-session也要重启（重要）
cp $KAFKA_HOME/libs/kafka-clients-3.3.1.jar $FLINK_HOME/lib
查看是否复制成功
$ ls $FLINK_HOME/lib
重启sql-client重新操作，成功如下：
Flink SQL> CREATE TABLE t1( > `event_time` TIMESTAMP(3) METADATA FROM 'timestamp',> --列名和元数据名一致可以省略 FROM 'xxxx', VIRTUAL表示只读> `partition` BIGINT METADATA VIRTUAL,> `offset` BIGINT METADATA VIRTUAL,> id int, > ts bigint , > vc int )> WITH (> 'connector' = 'kafka',> 'properties.bootstrap.servers' = 'node2:9092,node3:9092,node4:9094',> 'properties.group.id' = 'test',> -- 'earliest-offset', 'latest-offset', 'group-offsets', 'timestamp' and 'specific-offsets'> 'scan.startup.mode' = 'earliest-offset',> -- fixed为flink实现的分区器，一个并��度只写往kafka一个分区> 'sink.partitioner' = 'fixed',> 'topic' = 'ws1',> 'format' = 'json'> );[INFO] Execute statement succeed.Flink SQL> CREATE TABLE source ( > id INT, > ts BIGINT, > vc INT> ) WITH ( > 'connector' = 'datagen', > 'rows-per-second'='1', > 'fields.id.kind'='random', > 'fields.id.min'='1', > 'fields.id.max'='10', > 'fields.ts.kind'='sequence', > 'fields.ts.start'='1', > 'fields.ts.end'='1000000', > 'fields.vc.kind'='random', > 'fields.vc.min'='1', > 'fields.vc.max'='100'> );[INFO] Execute statement succeed.Flink SQL> insert into t1(id,ts,vc) select * from source;2024-06-14 10:45:30,125 WARN org.apache.flink.yarn.configuration.YarnLogConfigUtil [] - The configuration directory ('/home/hadoop/soft/flink-1.17.1/conf') already contains a LOG4J config file.If you want to use logback, then please delete or rename the log configuration file.2024-06-14 10:45:30,673 INFO org.apache.hadoop.yarn.client.RMProxy [] - Connecting to ResourceManager at node3/192.168.193.143:80322024-06-14 10:45:31,027 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - No path for the flink jar passed. Using the location of class org.apache.flink.yarn.YarnClusterDescriptor to locate the jar2024-06-14 10:45:31,227 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - Found Web Interface node3:41749 of application 'application_1718331886020_0001'.insert into t1(id,ts,vc) select * from source;[INFO] Submitting SQL update statement to the cluster...[INFO] SQL update statement has been successfully submitted to the cluster:Job ID: b1765f969c3ae637bd4c8100efbb0c4e查询Kafka表
select * from t1;报错
[ERROR] Could not execute SQL statement. Reason:java.lang.ClassNotFoundException: org.apache.kafka.clients.consumer.ConsumerRecord
重启yarn session，重新操作，成功如下：
Flink SQL> CREATE TABLE t1( > `event_time` TIMESTAMP(3) METADATA FROM 'timestamp',> --列名和元数据名一致可以省略 FROM 'xxxx', VIRTUAL表示只读> `partition` BIGINT METADATA VIRTUAL,> `offset` BIGINT METADATA VIRTUAL,> id int, > ts bigint , > vc int )> WITH (> 'connector' = 'kafka',> 'properties.bootstrap.servers' = 'node2:9092,node3:9092,node4:9094',> 'properties.group.id' = 'test',> -- 'earliest-offset', 'latest-offset', 'group-offsets', 'timestamp' and 'specific-offsets'> 'scan.startup.mode' = 'earliest-offset',> -- fixed为flink实现的分区器，一个并??度只写往kafka一个分区> 'sink.partitioner' = 'fixed',> 'topic' = 'ws1',> 'format' = 'json'> );[INFO] Execute statement succeed.Flink SQL> CREATE TABLE source ( > id INT, > ts BIGINT, > vc INT> ) WITH ( > 'connector' = 'datagen', > 'rows-per-second'='1', > 'fields.id.kind'='random', > 'fields.id.min'='1', > 'fields.id.max'='10', > 'fields.ts.kind'='sequence', > 'fields.ts.start'='1', > 'fields.ts.end'='1000000', > 'fields.vc.kind'='random', > 'fields.vc.min'='1', > 'fields.vc.max'='100'> );[INFO] Execute statement succeed.Flink SQL> insert into t1(id,ts,vc) select * from source;2024-06-14 11:22:17,971 WARN org.apache.flink.yarn.configuration.YarnLogConfigUtil [] - The configuration directory ('/home/hadoop/soft/flink-1.17.1/conf') already contains a LOG4J config file.If you want to use logback, then please delete or rename the log configuration file.2024-06-14 11:22:18,422 INFO org.apache.hadoop.yarn.client.RMProxy [] - Connecting to ResourceManager at node3/192.168.193.143:80322024-06-14 11:22:18,895 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - No path for the flink jar passed. Using the location of class org.apache.flink.yarn.YarnClusterDescriptor to locate the jar2024-06-14 11:22:19,052 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - Found Web Interface node4:38788 of application 'application_1718331886020_0002'.insert into t1(id,ts,vc) select * from source;[INFO] Submitting SQL update statement to the cluster...[INFO] SQL update statement has been successfully submitted to the cluster:Job ID: 84292f84d1fce4756ccd8ae294b6163aFlink SQL> select * from t1;2024-06-14 11:23:38,338 WARN org.apache.flink.yarn.configuration.YarnLogConfigUtil [] - The configuration directory ('/home/hadoop/soft/flink-1.17.1/conf') already contains a LOG4J config file.If you want to use logback, then please delete or rename the log configuration file.2024-06-14 11:23:38,606 INFO org.apache.hadoop.yarn.client.RMProxy [] - Connecting to ResourceManager at node3/192.168.193.143:80322024-06-14 11:23:38,617 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - No path for the flink jar passed. Using the location of class org.apache.flink.yarn.YarnClusterDescriptor to locate the jar2024-06-14 11:23:38,649 INFO org.apache.flink.yarn.YarnClusterDescriptor [] - Found Web Interface node4:38788 of application 'application_1718331886020_0002'.select * from t1;[INFO] Result retrieval cancelled.Flink SQL> 
upsert-kafka表
'connector' = 'upsert-kafka'
如果当前表存在更新操作，那么普通的kafka连接器将无法满足，此时可以使用Upsert Kafka连接器。
进入Flink Web UI，cancel掉所有running job，重新操作成功如下：
删除表
Flink SQL> show tables;+------------+| table name |+------------+| source || t1 || t2 |+------------+3 rows in setFlink SQL> drop table source;Flink SQL> drop table t1;Flink SQL> drop table t2;
创建表
CREATE TABLE source ( id INT, ts BIGINT, vc INT) WITH ( 'connector' = 'datagen', 'rows-per-second'='1', 'fields.id.kind'='random', 'fields.id.min'='1', 'fields.id.max'='10', 'fields.ts.kind'='sequence', 'fields.ts.start'='1', 'fields.ts.end'='1000000', 'fields.vc.kind'='random', 'fields.vc.min'='1', 'fields.vc.max'='100');CREATE TABLE t2( id int , sumVC int , primary key (id) NOT ENFORCED )WITH ( 'connector' = 'upsert-kafka', 'properties.bootstrap.servers' = 'node2:9092', 'topic' = 'ws2', 'key.format' = 'json', 'value.format' = 'json');设置显示模式
SET sql-client.execution.result-mode=tableau;
查询表
select * from t2;
完成！enjoy it!
