MongoDB Kafka Sink 连接器不处理 RenameByRegex 处理器

问题描述

我需要监听来自 Kafka Topic 和 Sink 的事件到 MongoDB 中的集合.消息包含一个带有 id 属性的嵌套对象，就像上面的例子一样.

I need to listening events from a Kafka Topic and Sink to a collection in MongoDB. The message contains an nested object with an id property, like in the example above.

{
    "testId": 1,
    "foo": "bar",
    "foos": [{ "id":"aaaaqqqq-rrrrr" }]
}

我正在尝试使用 RegExp 将此嵌套 id 重命名为 _id

I'm trying to rename this nested id to _id with RegExp

{
        "connector.class":"com.mongodb.kafka.connect.MongoSinkConnector",
        "topics": "test",
        "connection.uri": "mongodb://mongo:27017",
        "database": "test_db",
        "collection": "test",
        "key.converter": "org.apache.kafka.connect.storage.StringConverter",
        "value.converter": "org.apache.kafka.connect.json.JsonConverter",
        "value.converter.schemas.enable": "false",
        "document.id.strategy": "com.mongodb.kafka.connect.sink.processor.id.strategy.PartialValueStrategy",
        "value.projection.list":"testId",
        "value.projection.type": "whitelist",
        "post.processor.chain": "com.mongodb.kafka.connect.sink.processor.DocumentIdAdder, com.mongodb.kafka.connect.sink.processor.field.renaming.RenameByRegex",
        "field.renamer.regexp": "[{\"regexp\":\"\b(id)\b\", \"pattern\":\"\b(id)\b\",\"replace\":\"_id\"}]"
    }

配置/验证的结果是500 Internal Server Error，带有该消息:

And the result of a config/validate is 500 Internal Server Error, with that message:

{
    "error_code": 500,
    "message": null
}

我遗漏了什么还是有问题?

I missing something or is a issue?

推荐答案

我认为你想要的只是 Kafka Connect 单消息转换 (SMT)，更准确地说是 ReplaceField:

I think all you want is Kafka Connect Single Message Transform (SMT) and more precisely ReplaceField:

过滤或重命名结构或映射中的字段.

以下将用 _id 替换 id 字段名称:

"transforms": "RenameField",
"transforms.RenameField.type": "org.apache.kafka.connect.transforms.ReplaceField$Value",
"transforms.RenameField.renames": "id:_id"

在您的情况下，在应用上述转换之前，您可能还想Flatten foos:

"transforms": "flatten",
"transforms.flatten.type": "org.apache.kafka.connect.transforms.Flatten$Value",
"transforms.flatten.delimiter": "."

最后应用转换以重命名字段:

and finally apply the transformation for renaming the field:

"transforms": "RenameField",
"transforms.RenameField.type": "org.apache.kafka.connect.transforms.ReplaceField$Value",
"transforms.RenameField.renames": "foos.id:foos._id"

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