apache-kafka - 如何从kafka tapic为ksqldb创建主题
问题描述
我使用 Mysql 数据库。假设我有一张订单表。并使用 debezium mysql connect for Kafka,创建了订单主题。但是我在 ksqldb 中创建流时遇到了麻烦。
CREATE STREAM orders WITH (
kafka_topic = 'myserver.mydatabase.orders',
value_format = 'avro'
);
我的 docker-compose 文件看起来像这样
zookeeper:
image: confluentinc/cp-zookeeper:latest
container_name: zookeeper
privileged: true
ports:
- "2181:2181"
environment:
ZOOKEEPER_CLIENT_PORT: 2181
ZOOKEEPER_TICK_TIME: 2000
kafka:
image: confluentinc/cp-kafka:latest
container_name: kafka
depends_on:
- zookeeper
ports:
- '9092:9092'
environment:
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092
KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
schema-registry:
image: confluentinc/cp-schema-registry:latest
container_name: schema-registry
depends_on:
- kafka
- zookeeper
ports:
- "8081:8081"
environment:
SCHEMA_REGISTRY_KAFKASTORE_CONNECTION_URL: "zookeeper:2181"
SCHEMA_REGISTRY_HOST_NAME: schema-registry
kafka-connect:
hostname: kafka-connect
image: confluentinc/cp-kafka-connect:latest
container_name: kafka-connect
ports:
- 8083:8083
depends_on:
- schema-registry
environment:
CONNECT_BOOTSTRAP_SERVERS: kafka:9092
CONNECT_REST_PORT: 8083
CONNECT_GROUP_ID: "quickstart-avro"
CONNECT_CONFIG_STORAGE_TOPIC: "quickstart-avro-config"
CONNECT_OFFSET_STORAGE_TOPIC: "quickstart-avro-offsets"
CONNECT_STATUS_STORAGE_TOPIC: "quickstart-avro-status"
CONNECT_CONFIG_STORAGE_REPLICATION_FACTOR: 1
CONNECT_OFFSET_STORAGE_REPLICATION_FACTOR: 1
CONNECT_STATUS_STORAGE_REPLICATION_FACTOR: 1
CONNECT_KEY_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
CONNECT_VALUE_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
CONNECT_INTERNAL_KEY_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
CONNECT_INTERNAL_VALUE_CONVERTER: "org.apache.kafka.connect.json.JsonConverter"
CONNECT_REST_ADVERTISED_HOST_NAME: "kafka-connect"
CONNECT_LOG4J_ROOT_LOGLEVEL: DEBUG
CONNECT_PLUGIN_PATH: "/usr/share/java,/etc/kafka-connect/jars"
volumes:
- $PWD/kafka/jars:/etc/kafka-connect/jars
ksqldb-server:
image: confluentinc/ksqldb-server:latest
hostname: ksqldb-server
container_name: ksqldb-server
depends_on:
- kafka
ports:
- "8088:8088"
environment:
KSQL_LISTENERS: http://0.0.0.0:8088
KSQL_BOOTSTRAP_SERVERS: "kafka:9092"
KSQL_KSQL_LOGGING_PROCESSING_STREAM_AUTO_CREATE: "true"
KSQL_KSQL_LOGGING_PROCESSING_TOPIC_AUTO_CREATE: "true"
KSQL_KSQL_SCHEMA_REGISTRY_URL: "http://schema-registry:8081"
KSQL_CONNECT_VALUE_CONVERTER_SCHEMA_REGISTRY_URL: "http://schema-registry:8081"
ksqldb-cli:
image: confluentinc/ksqldb-cli:latest
container_name: ksqldb-cli
depends_on:
- kafka
- ksqldb-server
- schema-registry
entrypoint: /bin/sh
tty: true
必须首先为此表创建主题。avro、json有什么区别?
解决方案
使用 debezium mysql 连接 Kafka
您可以将其设置为使用AvroConverter
,然后将自动创建主题
否则,您可以使用 KSQL VALUE_FORMAT=JSON
,并且需要手动指定所有字段名称。不清楚您要问什么区别(它们是不同的序列化格式),但从 KSQL 的角度来看,与 Avro 等其他格式相比,JSON 单独被视为纯文本(类似于 DELIMITED)并且需要解析架构+字段是已知的。
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