In recent years, with the increase of big data and the spread of IoT technology and the continual evolution of hardware technology, the demand for data stream processing is further increased. Meanwhile, in the field of database systems, a new demand for HTAP (hybrid transactional and analytical processing) that integrates the functions of on-line transaction processing (OLTP) and on-line analytical processing (OLAP) is emerging. Based on this background, our group started a new project to develop data stream processing technologies in the HTAP environment in cooperation with other research groups in Japan. Our main focus is to develop new data stream processing methodologies such as fault tolerance in cooperation with the OLAP engine. In this paper, we describe the background, the objectives and the issues of the research.
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