[GitHub] [pulsar] whisper-bye edited a comment on issue #2992: schemas feature request

[GitBox <gi...@apache.org>]

whisper-bye edited a comment on issue #2992: schemas feature request
URL: https://github.com/apache/pulsar/issues/2992#issuecomment-601623655
 
 
   @nha @merlimat 
   
   sorry for asking.
   
   In my case, I have some raw json string data send to topic and can't hard code pojo class, I want to use the pulsar schema feature to validation the structure. I have a topic "my-topic" and associated with json schema in below, then I try to transmission some message.
   ```
   var producer = client.newProducer(Schema.AUTO_PRODUCE_BYTES();
   producer.send("{\"y\": 1}".getBytes()); // here! the value is 1(number) not string.
   
   var reader = client.newReader(Schema.AUTO_CONSUME())
   var message = reader.readNext();
   I got {"y": 1}
   ```
   
   my question is how pulsar schema works? The message should be rejected.
   
   ```
   {
     "version": 1,
     "schemaInfo": {
       "name": "my-topic",
       "schema": {
         "type": "record",
         "name": "Data",
         "namespace": "com.iot.test",
         "fields": [
           {
             "name": "y",
             "type": [
               "null",
               "string"
             ]
           }
         ]
       },
       "type": "JSON",
       "properties": {
         "__alwaysAllowNull": "true"
       }
     }
   }
   ```

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