Kafka Connect 不输出 JSON [英] Kafka Connect not outputting JSON

问题描述

我正在使用 JDBC Kafka 连接器将数据从数据库读取到 Kafka.这有效，但它总是以 Avro 格式输出数据，即使我已经指定它应该使用 JSON.我知道这样做是因为当我在 python 中使用来自该主题的消息时，我会在每条消息的顶部看到架构.

I am using the JDBC Kafka Connector to read data from a database into Kafka. That works, but it always outputs data in Avro format even though I've specified that it should use JSON. I know it is doing this because when I consume messages from that topic in python, I see the schema at the top of each message.

我像这样运行连接器:

/usr/bin/connect-standalone /etc/schema-registry/connect-json-standalone.properties /etc/kafka-connect-jdbc/view.properties

connect-json-standalone.properties 文件的内容为:

The content of the connect-json-standalone.properties file is:

bootstrap.servers=localhost:9092

key.converter=org.apache.kafka.connect.json.JsonConverter
key.converter.schema.registry.url=http://localhost:8081
key.converter.schemas.enable=true
value.converter=org.apache.kafka.connect.json.JsonConverter
value.converter.schema.registry.url=http://localhost:8081
value.converter.schemas.enable=true

internal.key.converter=org.apache.kafka.connect.json.JsonConverter
internal.value.converter=org.apache.kafka.connect.json.JsonConverter
internal.key.converter.schemas.enable=false
internal.value.converter.schemas.enable=false

# Local storage file for offset data
offset.storage.file.filename=/tmp/connect.offsets

/etc/kafka-connect-jdbc/view.properties 的内容是:

and the content of the /etc/kafka-connect-jdbc/view.properties is:

name=view-small-jdbc-daily
connector.class=io.confluent.connect.jdbc.JdbcSourceConnector
tasks.max=1
connection.url=jdbc:teradata://domain.com/charset=UTF8,DBS_PORT=1025,DATABASE=test,USER=***,PASSWORD=***,LOB_SUPPORT=OFF
mode=bulk
table.whitelist=test_table
topic.prefix=view5-

推荐答案

您的配置中有两个问题:

Two problems in your configuration:

1. 如果您使用 JSONConverter，则无需配置架构注册表 - 这仅适用于 AvroConverter.所以你可以删除 key.converter.schema.registry.url 和 value.converter.schema.registry.url
2. 其次，你有 key.converter.schemas.enable=true 和 value.converter.schemas.enable=true，所以你不应该对 JSON包括架构.您指定我们应该包括它.如果您不需要架构，只需将它们设置为 false

1. If you are using JSONConverter, you don't need to configure a schema registry - this is just for the AvroConverter. So you can remove key.converter.schema.registry.url and value.converter.schema.registry.url
2. Second, you have key.converter.schemas.enable=true and value.converter.schemas.enable=true, so you should not be surprised that the JSON includes a schema. You specified that we should include it. If you don't want a schema, just set those to false

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