Kafka-Rest Avro schema optional field error

[dxb20...@gmail.com]

I am using the kafka-rest-proxy to write out to the schema registry and kafka, but I am getting an error as below:

"Avro expected start union got value string"


I am using the kafka-rest-node client and my schema looks as follows:

{
  "type" : "record",
  "name" : "User",
  "namespace" : "com.test.kafka",
  "fields" : [ {
    "name" : "id",
    "type" : "string"
  }, {
    "name" : "name",
    "type" : "string"
  }, {
    "name" : "middleName",
    "type": ["null", "string"],
    "default":null
  }, {
    "name" : "lastName",
    "type": "string",
  }
}

Now, when the 'middleName' field is not included I'm getting this error. I am not sure what I'm doing wrong, I've read the following topics on the same issue, but they did not seem to have any resolution :

https://groups.google.com/forum/#!topic/confluent-platform/zFPEzC-ZzkY
https://groups.google.com/forum/#!msg/confluent-platform/Bigk_FeTXh0/B77_zCRhqUoJ

[Gwen Shapira]

Does this help? http://stackoverflow.com/questions/27485580/how-to-fix-expected-start-union-got-value-number-int-when-converting-json-to-av

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Gwen Shapira

Product Manager | Confluent

650.450.2760 | @gwenshap

Follow us: Twitter | blog

[Some One]

I've taken a look at that, but my client is a node-js client and I'm using the kafka-rest-node library provided by Confluent and getting this error.  Should the Confluent provided library not serialize to a loss-less json as expected by Schema registry ?

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--

Gwen Shapira

Product Manager | Confluent

650.450.2760 | @gwenshap

Follow us: Twitter | blog

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