Transferencia de datos de temas del productor de Java a Mongodb

Aug 15 2020

Produzco datos con Java y los sumerjo en el tema de Kafka, luego quiero que estos datos se sumerjan en MongoDB. Cuando envío los datos como JSON a través de JAVA, no se almacenarán en MongoDB debido a este error.

[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

Estos son los datos que envío a través de mi programa Java en el consumidor de Kafka.

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

Cada línea representa un récord

Aquí están mis archivos de configuración

connect-standalone.properties

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.properties

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

Respuestas

NARASIMHAMURTHY Aug 21 2020 at 18:14

Tariq - No soy un experto en este tema. Pero he intentado algo similar con el adaptador de sumidero JDBC con la base de datos Oracle. El formato de datos que está enviando al tema no me parece correcto. Por lo tanto, es posible que obtenga el error. Dado que está utilizando JsonConverter, cada fila del tema debe tener el siguiente formato para que el adaptador de receptor pueda analizar y escribir en un almacén de datos. Actualmente, sus datos no tienen esquema en la carga útil. De ahí el error. Pase lo siguiente al tema y vea si se conecta a MongoDB.

{"esquema": {"tipo": "estructura", "campos": [{"tipo": "cadena", "opcional": falso, "campo": "nombre"}, {"tipo": "cadena "," opcional ": verdadero," campo ":" dept "}, {" tipo ":" int64 "," opcional ": verdadero," campo ":" studentId "}]," opcional ": falso," nombre ":" YOUR_TABLE_NAME "}," payload ": {" name ":" Esto es una prueba "," dept ":" siqdj "," studentId ": 1}}