Canal 给 kafka 发消息，kafka 收不到消息问题

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#kafka #java #大数据 #canal

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文章讲述了在使用Canal将数据同步到Kafka时遇到的问题，即消息体超过Kafka的最大允许大小，导致服务异常。通过检查Zookeeper和Kafka日志未发现问题，最终在Canal日志中发现`RecordTooLargeException`错误。解决方案包括调整Canal服务端的`maxRequestSize`配置以及增大Kafka队列的最大消息体大小。

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文章目录

Canal 给 kafka 发消息问题

Canal 给 kafka 发消息问题

服务启动开始发消息正常，过一段时间后不发消息， kafka 收不到Canal 的消息

问题排查

1、zookeeper 服务日志没有问题
2、kafka 服务日志没有问题

3、canal 日志有报错

canal 日志有两块，直接看实例日志example.log

Caused by: org.apache.kafka.common.errors.RecordTooLargeException: The request included a message larger than the max message size the server will accept.
2022-07-14 16:39:40.826 [pool-4-thread-1] ERROR c.a.o.canal.connector.kafka.producer.CanalKafkaProducer - java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.RecordTooLargeException: The request included a message larger than the max message size the server will accept.
java.lang.RuntimeException: java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.RecordTooLargeException: The request included a message larger than the max message size the server will accept.
	at com.alibaba.otter.canal.connector.kafka.producer.CanalKafkaProducer.send(CanalKafkaProducer.java:184) ~[na:na]
	at com.alibaba.otter.canal.server.CanalMQStarter.worker(CanalMQStarter.java:181) [canal.server-1.1.5.jar:na]
	at com.alibaba.otter.canal.server.CanalMQStarter.access$100(CanalMQStarter.java:25) [canal.server-1.1.5.jar:na]
	at com.alibaba.otter.canal.server.CanalMQStarter$CanalMQRunnable.run(CanalMQStarter.java:223) [canal.server-1.1.5.jar:na]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_181]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_181]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_181]
Caused by: java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.RecordTooLargeException: The request included a message larger than the max message size the server will accept.
	at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.valueOrError(FutureRecordMetadata.java:94) ~[na:na]
	at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:64) ~[na:na]
	at org.apache.kafka.clients.producer.internals.FutureRecordMetadata.get(FutureRecordMetadata.java:29) ~[na:na]
	at com.alibaba.otter.canal.connector.kafka.producer.CanalKafkaProducer.send(CanalKafkaProducer.java:182) ~[na:na]
	... 6 common frames omitted

问题原因 canal服务异常

The request included a message larger than the max message size the server will accept.

解决方式

1、修改canal服务端kafka的配置

```java
canal.mq.maxRequestSize = 1048576 （默认为1m，根据需求修改）
```

2、修改队列的最大消息体大小

/bin/kafka-topics.sh --zookeeper 162.10.10.238:9093 --alter --topic devops --config max.message.bytes=10485760

或是直接重新创建容器

docker run --name kafka \
-p 9092:9092 \
-e KAFKA_BROKER_ID=0 \
-e KAFKA_AUTO_CREATE_TOPICS_ENABLE=true \
-e KAFKA_ZOOKEEPER_CONNECT=ip:2182 \    // zookeeper 地址
-e KAFKA_ADVERTISED_LISTENERS=PLAINTEXT://ip:9093 \  // kafka 地址
-e KAFKA_MESSAGE_MAX_BYTES=10485760 \
-e KAFKA_LISTENERS=PLAINTEXT://0.0.0.0:9092 \
-d  wurstmeister/kafka