Using Materialized View as a Service of Scallop4SC for Smart City Application Services

Smart city provides various value-added services by collecting largescale data from houses and infrastructures within a city. However, it takes a long time and man-hour and needs knowledge about big data processing for individual applications to use and process the large-scale raw data directly. To reduce the response time, we use the concept of materialized view of database, and materialized view to be as a service. And we propose materialized view to be as as service (MVaaS). In our proposition, a developer of an application can efficiently and dynamically use large-scale data from smart city by describing simple data specification without considering distributed processes and materialized views. In this paper, we design an architecture of MVaaS using MapReduce on Hadoop and HBase KVS. And we demonstrate the effectiveness of MVaaS through three case studies. If these services uses raw data, it needs enormous time of calculation and is not realistic.