我正在尝试创建一个 Debezium MySQL 连接器,并进行转换以提取 key 。
关键改造前:
create source connector mysql with(
"connector.class" = 'io.debezium.connector.mysql.MySqlConnector',
"database.hostname" = 'mysql',
"tasks.max" = '1',
"database.port" = '3306',
"database.user" = 'debezium',
"database.password" = 'dbz',
"database.server.id" = '42',
"database.server.name" = 'before',
"table.whitelist" = 'deepprices.deepprices',
"database.history.kafka.bootstrap.servers" = 'kafka:29092',
"database.history.kafka.topic" = 'dbz.deepprices',
"include.schema.changes" = 'true',
"transforms" = 'unwrap',
"transforms.unwrap.type" = 'io.debezium.transforms.UnwrapFromEnvelope');
主题结果是:
> rowtime: 2020/05/20 16:47:23.354 Z, key: [St@5778462697648631933/8247607644536792125], value: {"id": "P195910", "price": "1511.64"}
当 key.converter 设置为 JSON 时,Key 变为
{"id": "P195910"}
所以,我想从键中提取 id 并将其设为字符串键:
预期成绩 :
rowtime: 2020/05/20 16:47:23.354 Z,
key: 'P195910',
value: {"id": "P195910", "price": "1511.64"}
尝试使用
ExtractField
进行转换时或 ValueToKey
我得到:
DataException: Field does not exist: id
:
我尝试使用包含
ValueToKey
的指令:create source connector mysql with(
"connector.class" = 'io.debezium.connector.mysql.MySqlConnector',
"database.hostname" = 'mysql',
"tasks.max" = '1',
"database.port" = '3306',
"database.user" = 'debezium',
"database.password" = 'dbz',
"database.server.id" = '42',
"database.server.name" = 'after',
"table.whitelist" = 'deepprices.deepprices',
"database.history.kafka.bootstrap.servers" = 'kafka:29092',
"database.history.kafka.topic" = 'dbz.deepprices',
"include.schema.changes" = 'true',
"key.converter" = 'org.apache.kafka.connect.json.JsonConverter',
"key.converter.schemas.enable" = 'TRUE',
"value.converter" = 'org.apache.kafka.connect.json.JsonConverter',
"value.converter.schemas.enable" = 'TRUE',
"transforms" = 'unwrap,createkey',
"transforms.unwrap.type" = 'io.debezium.transforms.UnwrapFromEnvelope',
"transforms.createkey.type" = 'org.apache.kafka.connect.transforms.ValueToKey',
"transforms.createkey.fields" = 'id'
);
导致我的 出现以下错误Kafka 连接日志 :
Caused by: org.apache.kafka.connect.errors.DataException: Field does not exist: id
at org.apache.kafka.connect.transforms.ValueToKey.applyWithSchema(ValueToKey.java:89)
at org.apache.kafka.connect.transforms.ValueToKey.apply(ValueToKey.java:67)
最佳答案
从 UnwrapFromEnvelope
更改转换类型至 ExtractNewRecordState
,解决了 Debezium MySQL CDC 连接器的问题,版本 1.1.0
.
transforms.unwrap.type" = 'io.debezium.transforms.ExtractNewRecordState'
关于apache-kafka - 使用 Debezium 提取 key 的转换中不存在字段,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61919200/