I. Introduction
Nowadays, a massive amount of data, so called big data, are generated from various sources such as Internet of Things (IoT), graph data, and/or structured data. For some applications such as IoT, the data is continuously sent out, which becomes streaming data. These data sometimes require real-time processing after receiving at the target. This may lead to a heavy workload on the processing servers, which results in slow response time to the large data volume.