apache-kafka - Kafka Connect JDBC 连接器 - 由于不可恢复的异常而退出 WorkerSinkTask

Question

我正在使用 JDBC 接收器连接器，并且该主题中有一条错误消息。我知道为什么该消息不好(由于生产者的问题而违反 FK 约束而失败)。工作任务报告的错误是:

org.apache.kafka.connect.errors.ConnectException: Exiting WorkerSinkTask due to unrecoverable exception.
org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:587)
org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:323)
org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:226)
org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:194)
org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:175)
org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:219)
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
java.util.concurrent.FutureTask.run(FutureTask.java:266)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
java.lang.Thread.run(Thread.java:748)\nCaused by: org.apache.kafka.connect.errors.ConnectException: java.sql.SQLException: java.sql.BatchUpdateException: Cannot add or update a child row: a foreign key constraint fails (`sensorium`.`reading`, CONSTRAINT `reading_ibfk_1` FOREIGN KEY (`sensorId`) REFERENCES `sensor` (`id`))\ncom.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot add or update a child row: a foreign key constraint fails (`sensorium`.`reading`, CONSTRAINT `reading_ibfk_1` FOREIGN KEY (`sensorId`) REFERENCES `sensor` (`id`))\n
io.confluent.connect.jdbc.sink.JdbcSinkTask.put(JdbcSinkTask.java:86)
org.apache.kafka.connect.runtime.WorkerSinkTask.deliverMessages(WorkerSinkTask.java:565)\n\t... 10 more\nCaused by: java.sql.SQLException: java.sql.BatchUpdateException: 
Cannot add or update a child row: a foreign key constraint fails
(`sensorium`.`reading`, CONSTRAINT `reading_ibfk_1` FOREIGN KEY (`sensorId`) REFERENCES `sensor` 
(`id`))\ncom.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolation
Exception: Cannot add or update a child row: a foreign key constraint
fails (`sensorium`.`reading`, CONSTRAINT `reading_ibfk_1` FOREIGN KEY
(`sensorId`) REFERENCES `sensor` (`id`))

我想要发生的是跳过这个坏消息。所以我尝试设置 "errors.tolerance": "all"。接收器连接器的完整配置如下:

{
    "name": "reading-sink2",
    "config": {
        "connector.class": "io.confluent.connect.jdbc.JdbcSinkConnector",
        "tasks.max": 4,
        "topics": "READING_MYSQL",
        "key.converter.schema.registry.url": "http://localhost:8081",
        "key.converter": "org.apache.kafka.connect.storage.StringConverter",
        "value.converter": "io.confluent.connect.avro.AvroConverter",
        "value.converter.schema.registry.url": "http://localhost:8081",
        "connection.url": "jdbc:mysql://localhost:3306/sensorium?user=app&password=tQpRMCzHlAeu6kQIBk4U",
        "auto.create": true,
        "table.name.format": "reading",
        "errors.tolerance": "all"
    }
}

但是正在记录相同的错误，该消息不会被跳过，后续消息也不会被处理。

为什么 errors.tolerance: all 没有按预期工作？

Answer 1

errors.tolerance属性指的是在转换(与 Kafka Connect 模式之间的消息转换)或转换消息(应用单消息转换)期间发生的错误。

您无法跳过/吞咽 SinkTask::put(Collection<SinkRecord> records) 期间引发的异常或SourceTask::poll()

在您的情况下，SinkTask::put(...) 中抛出异常。

io.confluent.connect.jdbc.sink.JdbcSinkTask.put(JdbcSinkTask.java:86)

有关类似问题的问题:

• Kafka Connect sink tasks ignore tolerance limits
• kafka connect - jdbc sink sql exception
• Apache Kafka JDBC Connector - SerializationException: Unknown magic byte

您可以在汇合页面的以下博客中阅读更多相关信息:https://www.confluent.io/blog/kafka-connect-deep-dive-error-handling-dead-letter-queues