Python中文网

一个关于 编程问题的解答网站.

有 Java 编程相关的问题?

你可以在下面搜索框中键入要查询的问题!

从Java producer到Mongodb的json主题数据

2 日，11 小时 Questions & Answers

我用java生成数据并将其放入Kafka topic，然后我希望将这些数据放入MongoDB。 当我通过JAVA以JSON的形式发送数据时，由于这个错误，它不会存储到MongoDB中

[2020-08-15 18:42:19,164] ERROR WorkerSinkTask{id=Kafka_ops-0} Task threw an uncaught and unrecoverable exception. Task is being killed and will not recover until manually restarted. Error: JSON reader was expecting a value but found 'siqdj'. (org.apache.kafka.connect.runtime.WorkerSinkTask)
org.bson.json.JsonParseException: JSON reader was expecting a value but found 'siqdj'.
        at org.bson.json.JsonReader.readBsonType(JsonReader.java:270)
        at org.bson.AbstractBsonReader.verifyBSONType(AbstractBsonReader.java:680)
        at org.bson.AbstractBsonReader.checkPreconditions(AbstractBsonReader.java:722)
        at org.bson.AbstractBsonReader.readStartDocument(AbstractBsonReader.java:450)
        at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:81)
        at org.bson.BsonDocument.parse(BsonDocument.java:62)
        at com.mongodb.kafka.connect.sink.converter.JsonRawStringRecordConverter.convert(JsonRawStringRecordConverter.java:34)
        at com.mongodb.kafka.connect.sink.converter.SinkConverter.convert(SinkConverter.java:44)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$buildWriteModel$6(MongoSinkTask.java:229)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.buildWriteModel(MongoSinkTask.java:228)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.processSinkRecords(MongoSinkTask.java:169)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$put$2(MongoSinkTask.java:117)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$put$3(MongoSinkTask.java:116)
        at java.util.HashMap.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.put(MongoSinkTask.java:114)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:560)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:323)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:226)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:198)
        at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:185)
        at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:235)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
[2020-08-15 18:42:19,166] ERROR WorkerSinkTask{id=Kafka_ops-0} Task threw an uncaught and unrecoverable exception (org.apache.kafka.connect.runtime.WorkerTask)
org.apache.kafka.connect.errors.ConnectException: Exiting WorkerSinkTask due to unrecoverable exception.
        at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:588)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:323)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:226)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:198)
        at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:185)
        at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:235)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)
Caused by: org.bson.json.JsonParseException: JSON reader was expecting a value but found 'siqdj'.
        at org.bson.json.JsonReader.readBsonType(JsonReader.java:270)
        at org.bson.AbstractBsonReader.verifyBSONType(AbstractBsonReader.java:680)
        at org.bson.AbstractBsonReader.checkPreconditions(AbstractBsonReader.java:722)
        at org.bson.AbstractBsonReader.readStartDocument(AbstractBsonReader.java:450)
        at org.bson.codecs.BsonDocumentCodec.decode(BsonDocumentCodec.java:81)
        at org.bson.BsonDocument.parse(BsonDocument.java:62)
        at com.mongodb.kafka.connect.sink.converter.JsonRawStringRecordConverter.convert(JsonRawStringRecordConverter.java:34)
        at com.mongodb.kafka.connect.sink.converter.SinkConverter.convert(SinkConverter.java:44)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$buildWriteModel$6(MongoSinkTask.java:229)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.buildWriteModel(MongoSinkTask.java:228)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.processSinkRecords(MongoSinkTask.java:169)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$put$2(MongoSinkTask.java:117)
        at java.util.ArrayList.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.lambda$put$3(MongoSinkTask.java:116)
        at java.util.HashMap.forEach(Unknown Source)
        at com.mongodb.kafka.connect.sink.MongoSinkTask.put(MongoSinkTask.java:114)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:560)
        ... 10 more

以下是我通过java程序在Kafka consumer中发送的数据

{"name":"This is a test","dept":"siqdj","studentId":1}
{"name":"This is another","dept":"siqdj","studentId":2}

每行代表一条记录

这是我的配置文件

独立连接。属性

bootstrap.servers=localhost:9092

# The converters specify the format of data in Kafka and how to translate it into Connect data. Every Connect user will
# need to configure these based on the format they want their data in when loaded from or stored into Kafka
key.converter=org.apache.kafka.connect.storage.StringConverter
value.converter=org.apache.kafka.connect.json.JsonConverter
# Converter-specific settings can be passed in by prefixing the Converter's setting with the converter we want to apply
# it to
key.converter.schemas.enable=false
value.converter.schemas.enable=false

offset.storage.file.filename=/tmp/connect.offsets
# Flush much faster than normal, which is useful for testing/debugging
offset.flush.interval.ms=10000
plugin.path=/plugins

MongoSinkConnector。属性

name=Kafka_ops
connector.class=com.mongodb.kafka.connect.MongoSinkConnector
tasks.max=1
topics=TestTopic4
connection.uri=mongodb://mongo1:27017,mongo2:27017,mongo3:27017
database=student_kafka
collection=students
key.converter=org.apache.kafka.connect.storage.StringConverter
key.converter.schemas.enable=false
value.converter=org.apache.kafka.connect.json.JsonConverter
value.converter.schemas.enable=false

共 (1) 个答案

  1. # 1 楼答案

    塔里克——我不是这方面的专家。但我在JDBC sink adapter和Oracle数据库上也做过类似的尝试

    您发送到主题的数据格式在我看来不正确。因此，您可能会遇到错误。由于您使用的是JsonConverter，因此主题中的每一行都应采用以下格式，以便接收器适配器解析并写入数据存储。 当前，您的数据在有效负载中没有架构。因此出现了错误

    请将下面的内容传递给主题，看看它是否会进入MongoDB

    {
    "schema": {
        "type": "struct",
        "fields": [
            {
                "type": "string",
                "optional": false,
                "field": "name"
            },
            {
                "type": "string",
                "optional": true,
                "field": "dept"
            },
            {
                "type": "int64",
                "optional": true,
                "field": "studentId"
            }
        ],
        "optional": false,
        "name": "YOUR_TABLE_NAME"
    },
    "payload": {
        "name": "This is a test",
        "dept": "siqdj",
        "studentId": 1
    }
}