我设置了一个 Kafka JDBC 接收器来将事件发送到 PostgreSQL。 我编写了这个简单的生产者,它将带有架构 (avro) 数据的 JSON 发送到一个主题,如下所示:
producer.py (kafka-python)
biometrics = {
"heartbeat": self.pulse, # integer
"oxygen": self.oxygen,# integer
"temprature": self.temprature, # float
"time": time # string
}
avro_value = {
"schema": open(BASE_DIR+"/biometrics.avsc").read(),
"payload": biometrics
}
producer.send("biometrics",
key="some_string",
value=avro_value
)
价值架构:
{
"type": "record",
"name": "biometrics",
"namespace": "athlete",
"doc": "athletes biometrics"
"fields": [
{
"name": "heartbeat",
"type": "int",
"default": 0
},
{
"name": "oxygen",
"type": "int",
"default": 0
},
{
"name": "temprature",
"type": "float",
"default": 0.0
},
{
"name": "time",
"type": "string"
"default": ""
}
]
}
连接器配置(没有主机、密码等)
{
"name": "jdbc_sink",
"connector.class": "io.aiven.connect.jdbc.JdbcSinkConnector",
"tasks.max": "1",
"key.converter": "org.apache.kafka.connect.storage.StringConverter ",
"value.converter": "io.confluent.connect.avro.AvroConverter",
"topics": "biometrics",
"insert.mode": "insert",
"auto.create": "true"
}
但我的连接器严重失败,出现三个错误,我无法找出其中任何一个的原因:
TL;DR;日志版本
(Error 1) Caused by: org.apache.kafka.connect.errors.DataException: biometrics
(Error 2) Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id -1
(Error 3) Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!
完整日志
org.apache.kafka.connect.errors.ConnectException: Tolerance exceeded in error handler
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:206)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:132)
at org.apache.kafka.connect.runtime.WorkerSinkTask.convertAndTransformRecord(WorkerSinkTask.java:498)
at org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:475)
at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:325)
at org.apache.kafka.connect.runtime.WorkerSinkTask.iteration(WorkerSinkTask.java:229)
at org.apache.kafka.connect.runtime.WorkerSinkTask.execute(WorkerSinkTask.java:201)
at org.apache.kafka.connect.runtime.WorkerTask.doRun(WorkerTask.java:185)
at org.apache.kafka.connect.runtime.WorkerTask.run(WorkerTask.java:235)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: org.apache.kafka.connect.errors.DataException: biometrics
at io.confluent.connect.avro.AvroConverter.toConnectData(AvroConverter.java:98)
at org.apache.kafka.connect.storage.Converter.toConnectData(Converter.java:87)
at org.apache.kafka.connect.runtime.WorkerSinkTask.lambda$convertAndTransformRecord$1(WorkerSinkTask.java:498)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:156)
at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:190)
... 13 more
Caused by: org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id -1
Caused by: org.apache.kafka.common.errors.SerializationException: Unknown magic byte!
有人能帮我理解这些错误和根本原因吗?
答案 0 :(得分:1)
该错误是因为您需要在连接器中使用带有 class Fish (object):
def __init__(self, name):
self.name = name
def swim(self):
print(self.name + " swam.")
class Salmon(Fish):
pass
flipper = Fish("FLIPPER")
salmon = Salmon("FOO")
Salmon.swim(flipper)
Fish.swim(flipper)
print(flipper.name)
Fish.swim(flipper)
Fish.swim(salmon)
的 JSONConverter 类,因为这是生成的,但是 FLIPPER swam.
FLIPPER swam.
FLIPPER
FLIPPER swam.
FOO swam.
负载不是一个 Avro value.converter.schemas.enabled=true
的模式表示,因此仅凭这些更改它可能仍然会失败...
如果您想真正发送 Avro,请使用 schema
库中的 AvroProducer,这需要运行 Schema Registry。