[GitHub] [pulsar] jiazhai opened a new issue #3925: Meet schema error while using debezium source.

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

jiazhai opened a new issue #3925: Meet schema error while using debezium source.
URL: https://github.com/apache/pulsar/issues/3925
 
 
   **Describe the bug**
   If a debezium source connector stop and start again. the internal PulsarSink's schema type is changed.
   
   In PulsarSink.open(), the schema is changed while restart the source.
   Add a log after initializeSchema(): 
   ```
       public void open(Map<String, Object> config, SinkContext sinkContext) throws Exception {
           log.info("Opening pulsar sink with config: {}", pulsarSinkConfig);
          Schema<T> schema = initializeSchema();
          log.error("++++ schemainfo: name:{}, type:{}, string:{}", info.getName(), info.getType(), info.toString())
   ```
   Here is the log of first run, the schema is KeyValue schema, which is right.
   ```
    17:11:31.557 [public/default/debezium-postgres-source-0] INFO  org.apache.pulsar.functions.sink.PulsarSink - Opening pulsar sink with config: PulsarSinkConfig(processingGuarantees=ATLEAST_ONCE,        topic=debezium-postgres-topic, serdeClassName=null, schemaType=null, typeClassName=org.apache.pulsar.common.schema.KeyValue)
    17:11:31.707 [pulsar-client-io-1-1] INFO  org.apache.pulsar.client.impl.ConnectionPool - [[id: 0x4b095a03, L:/127.0.0.1:49721 - R:localhost/127.0.0.1:6650]] Connected to server
    17:11:31.731 [public/default/debezium-postgres-source-0] ERROR org.apache.pulsar.functions.sink.PulsarSink - ++++ schemainfo: name:KeyValue, type:KEY_VALUE, string:SchemaInfo(name=KeyValue,            schema=[0, 0, 0, 0, 0, 0, 0, 0], type=KEY_VALUE, properties={})
   ```
   Here is the log of second run, get a wrong Bytes Schema:
   ```
   17:16:31.409 [public/default/debezium-postgres-source-0] INFO  org.apache.pulsar.functions.sink.PulsarSink - Opening pulsar sink with config: PulsarSinkConfig(processingGuarantees=ATLEAST_ONCE,        topic=debezium-postgres-topic, serdeClassName=null, schemaType=null, typeClassName=org.apache.pulsar.common.schema.KeyValue)
    17:16:31.526 [pulsar-client-io-1-1] INFO  org.apache.pulsar.client.impl.ConnectionPool - [[id: 0x4519d8a5, L:/127.0.0.1:50018 - R:localhost/127.0.0.1:6650]] Connected to server
    17:16:31.547 [public/default/debezium-postgres-source-0] ERROR org.apache.pulsar.functions.sink.PulsarSink - ++++ schemainfo: name:Bytes, type:BYTES, string:SchemaInfo(name=Bytes, schema=[],           type=BYTES, properties={})
   ```
   

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