我正在使用 Debezium 来检测 MySql 源表中的更改。如何生成 Kafka 消息,使得键是数字 ( Long
) 值而不是 Json 对象?
我得到了什么:
key: {"foo_id": 123}
value: {"foo_id": 123, "bar": "blahblah", "baz": "meh......"}
我想要的是:
key: 123
value: {"foo_id": 123, "bar": "blahblah", "baz": "meh......"}
我的 FOO 表如下所示:
foo_id: INT
bar: VARCHAR
baz: VARCHAR
请注意,我没有使用 avro,并且我尝试了以下几种组合(带和不带密钥转换器),但未能获得Long
密钥。
"transforms": "unwrap,insertKey,extractKey",
"transforms.unwrap.type":"io.debezium.transforms.UnwrapFromEnvelope",
"transforms.unwrap.drop.tombstones":"false",
"transforms.insertKey.type":"org.apache.kafka.connect.transforms.ValueToKey",
"transforms.insertKey.fields":"foo_id",
"transforms.extractKey.type":"org.apache.kafka.connect.transforms.ExtractField$Key",
"transforms.extractKey.field":"foo_id",
"key.converter" : "org.apache.kafka.connect.converters.LongConverter",
"key.converter.schemas.enable": "false",
"value.converter" : "org.apache.kafka.connect.json.JsonConverter",
"value.converter.schemas.enable": "false"
我不确定 ValueToKey 或 ExtractField 是否适用于(MySQL)源,但我低于 NPE。
Caused by: java.lang.NullPointerException
at org.apache.kafka.connect.transforms.ValueToKey.applyWithSchema(ValueToKey.java:85)
at org.apache.kafka.connect.transforms.ValueToKey.apply(ValueToKey.java:65)
at org.apache.kafka.connect.runtime.TransformationChain.lambda$apply$0(TransformationChain.java:44)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:128)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:162)