presto-main/src/main/java/io/prestosql/execution/buffer/ClientBuffer.java/ClientBuffer/ClientBuffer
class ClientBuffer:    public ClientBuffer(String taskInstanceId, OutputBufferId bufferId)
    {
        this.taskInstanceId = requireNonNull(taskInstanceId, "taskInstanceId is null");
        this.bufferId = requireNonNull(bufferId, "bufferId is null");
    }