libenchao commented on a change in pull request #12428: URL: https://github.com/apache/flink/pull/12428#discussion_r433593166
########## File path: flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/AvroRowDeserializationSchema.java ########## @@ -157,13 +150,13 @@ public AvroRowDeserializationSchema(String avroSchemaString) { record = new GenericData.Record(schema); datumReader = new GenericDatumReader<>(schema); inputStream = new MutableByteArrayInputStream(); - decoder = DecoderFactory.get().binaryDecoder(inputStream, null); } @Override public Row deserialize(byte[] message) throws IOException { try { inputStream.setBuffer(message); + Decoder decoder = DecoderFactory.get().binaryDecoder(inputStream, null); Review comment: AvroRowDataDeserializationSchema should also be considered. ########## File path: flink-formats/flink-avro/src/main/java/org/apache/flink/formats/avro/AvroRowDeserializationSchema.java ########## @@ -157,13 +150,13 @@ public AvroRowDeserializationSchema(String avroSchemaString) { record = new GenericData.Record(schema); datumReader = new GenericDatumReader<>(schema); inputStream = new MutableByteArrayInputStream(); - decoder = DecoderFactory.get().binaryDecoder(inputStream, null); } @Override public Row deserialize(byte[] message) throws IOException { try { inputStream.setBuffer(message); + Decoder decoder = DecoderFactory.get().binaryDecoder(inputStream, null); Review comment: Do you known the overhead of `DecoderFactory.get().binaryDecoder(inputStream, null);`? If it's heavy, maybe we can get a new decoder when encounters a schema change exception? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org