I was running confluent(v5.5.1) s3 sink connector with below config:
"value.converter":"io.confluent.connect.avro.AvroConverter",
"value.converter.schema.registry.url":"http://registryurl",
"value.converter.value.subject.name.strategy":"io.confluent.kafka.serializers.subject.RecordNameStrategy",
......
And got below error in the log like:
DEBUG Sending GET with input null to http://registryurl/schemas/ids/309?fetchMaxId=false
DEBUG Sending POST with input {......} to http://registryurl/MyRecordName?deleted=true
Caused by: org.apache.kafka.common.errors.SerializationException: Error retrieving Avro value schema version for id 309
Caused by: io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException: Subject not found.; error code: 40401
There are 2 questions that baffles me here:
Why the sink connector sends additional POST request to schema registry given it's just a consumer? And I have successfully received messages when using a standard kafka consumer, which ONLY sends a GET request to the schema registry.
As per this docs and official doc, the schema subject format will be like SubjectNamingStrategy-value or -key. However judging by the log, it does not suffix the request with "-value". I have tried all the 3 strategies and found ONLY the default TopicNameStrategy works as expected.
Appreciated if anyone could shed some light here.
Thanks a lot
Related
I am trying to read avro records stored in S3 in order to put them back in a kafka topic using the S3 source provided by confluent.
I already have the topics and the registry setup with the right schemas but when the connect S3 source tries to serialize the my records to the topics I get this error
Caused by: org.apache.kafka.common.errors.SerializationException:
Error registering Avro schema: ... at
io.confluent.kafka.serializers.AbstractKafkaAvroSerializer.serializeImpl(AbstractKafkaAvroSerializer.java:121)
at
io.confluent.connect.avro.AvroConverter$Serializer.serialize(AvroConverter.java:143)
at
io.confluent.connect.avro.AvroConverter.fromConnectData(AvroConverter.java:84)
... 15 more Caused by:
io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException:
Subject com-row-count-value is in read-only mode; error code: 42205
at
io.confluent.kafka.schemaregistry.client.rest.RestService.sendHttpRequest(RestService.java:292)
at
io.confluent.kafka.schemaregistry.client.rest.RestService.httpRequest(RestService.java:352)
at
io.confluent.kafka.schemaregistry.client.rest.RestService.registerSchema(RestService.java:495)
at
io.confluent.kafka.schemaregistry.client.rest.RestService.registerSchema(RestService.java:486)
at
io.confluent.kafka.schemaregistry.client.rest.RestService.registerSchema(RestService.java:459)
at
io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.registerAndGetId(CachedSchemaRegistryClient.java:214)
at
io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.register(CachedSchemaRegistryClient.java:276)
at
io.confluent.kafka.schemaregistry.client.CachedSchemaRegistryClient.register(CachedSchemaRegistryClient.java:252)
at
io.confluent.kafka.serializers.AbstractKafkaAvroSerializer.serializeImpl(AbstractKafkaAvroSerializer.java:75)
it seems that the connect producer does not try to get the schema_id if it exists but tries to write it but my registry is readonly.
Anyone knows if this is an issue or there are some configuration I am missing ?
If you're sure the correct schema for that subject is already registered by some other means, you can try to set auto.register.schemas to false in the serializer configuration.
See here for more details: https://docs.confluent.io/platform/current/schema-registry/serdes-develop/index.html#handling-differences-between-preregistered-and-client-derived-schemas
I am new to Kafka. I have written a simple JAVA program to generate a message using avro schema. I have generated a specific record. The record is generated successfully. My schema is not yet registered with my local environment. It is currently registered with some other environment.
I am using the apache kafka producer library to publish the message to my local environment kafka topic. Can I publish the message to the local topic or the schema needs to be registered with the local schema registry as well.
Below are the producer properties -
properties.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
properties.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, KafkaAvroSerializer.class);
properties.put(KafkaAvroSerializerConfig.SCHEMA_REGISTRY_URL_CONFIG, "https://schema-registry.xxxx.service.dev:443");```
Error I am getting while publishing the message -
``` org.apache.kafka.common.errors.SerializationException: Error registering Avro schema:
Caused by: io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException: User is denied operation Write on Subject: xxx.avro-value; error code: **40301**
The issue was kafka producer by default tries to register the schema on topic. So, I added the below - properties.put(KafkaAvroSerializerConfig.AUTO_REGISTER_SCHEMAS, false);
and it resolved the issue.
I am trying to run kafka connect for elastic search .
But because of some mistake i entered wrong record in kafka topic .
Now i fixed that issue and inserting correct value but elastic search is still throwing error on previous record in the topic
Here is the error
Caused by: org.apache.kafka.connect.errors.DataException: Converting byte[] to Kafka Connect data failed due to serialization error
Caused by: org.apache.kafka.common.errors.SerializationException: com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'lambdaDemo0': was expecting ('true', 'false' or 'null')
at [Source: (byte[])"lambdaDemo0-9749-0e710000fd04"; line: 1, column: 13]
Is there any way i can ignore the older record in the topic and tell kafka connect to pick latest record ?
I am trying to delete the topic i get topic marked for deletion but still records are present in the topic .
I tried below two properties but does seems to be working
drop.invalid.message=true
behavior.on.malformed.documents=ignore
Please suggest how i can clean up the wrong record in the topic
You can tell Kafka Connect to just skip bad records
errors.tolerance = all
Optionally, you can route these messages to another topic (known as a dead letter queue) for inspection by adding
errors.tolerance = all
errors.deadletterqueue.topic.name = my-dlq-topic
These settings are valid for Kafka Connect with any connector that is failing in the serialisation/deserialisation stage of processing. For more information see this article.
In my use case, i had created JDBC kafka connector, pulled the data from oracle table and sucessfully pushed to kafka topic but when i try to read the messages from this kafka topic i get the deserialization issue as listed below.
org.apache.kafka.common.errors.SerializationException: Error deserializing Avro message for id 2
Caused by: java.net.MalformedURLException: unknown protocol: localhost
at java.net.URL.<init>(URL.java:593)
at java.net.URL.<init>(URL.java:483)
at java.net.URL.<init>(URL.java:432)
at io.confluent.kafka.schemaregistry.client.rest.RestService.sendHttpRequest(RestService.java:124)
at io.confluent.kafka.schemaregistry.client.rest.RestService.httpRequest(RestService.java:188)
at io.confluent.kafka.schemaregistry.client.rest.RestService.getId(RestService.java:330)
The problem is the schema registry URL in the YAML configuration file. Notice unknown protocol error
Change it to this (note I added the http:// protocol to the URL line), and it should work:
schema:
version: latest2
registry:
url: http://localhost:8081
Background: i used wrong avro schema registry while producing to prod topic and as a result the kafka connect went down because of the messages with wrong schema id.So as a recovery plan we wanted to copy the messages in the prod topic to a test topic and then write the good messages to the hdfs.But we are facing issues with certain offsets that have wrong schema id while reading from prod topic.Is there a way to ignore such offsets while writing to another topic.
Exception in thread "StreamThread-1"
org.apache.kafka.streams.errors.StreamsException: Failed to deserialize value
for record. topic=xxxx, partition=9, offset=1259032
Caused by: org.apache.kafka.common.errors.SerializationException: Error
retrieving Avro schema for id 600
Caused by:
io.confluent.kafka.schemaregistry.client.rest.exceptions.RestClientException:
Schema not found io.confluent.rest.exceptions.RestNotFoundException: Schema not found
io.confluent.rest.exceptions.RestNotFoundException: Schema not found
{code}
You can change the deserialization exception handler to skip over those record as describe in the docs: https://docs.confluent.io/current/streams/faq.html#handling-corrupted-records-and-deserialization-errors-poison-pill-records
Ie, you set LogAndContinueExceptionHandler in the config via parameter default.deserialization.exception.handler.