This paper discusses the challenges and opportunities of real-time processing of big data in cloud computing environments. It covers the current state of cloud computing and big data technologies, and the increasing demand for real-time processing capabilities in big data applications. The paper also provides a comprehensive overview of the current approaches to real-time processing in cloud environments and the key trade-offs between these approaches. The authors present a case study of a cloud-based real-time processing system, highlighting its design considerations, implementation details, and performance results. The paper concludes by discussing the future directions and open research questions in real-time processing of big data in cloud computing environments.