presto-kafka/src/main/java/io/prestosql/plugin/kafka/KafkaConnectorConfig.java/KafkaConnectorConfig/setKafkaBufferSize
class KafkaConnectorConfig:    @Config("kafka.buffer-size")
    public KafkaConnectorConfig setKafkaBufferSize(String kafkaBufferSize)
    {
        this.kafkaBufferSize = DataSize.valueOf(kafkaBufferSize);
        return this;
    }