Abstract
Today, more and more data-intensive applications are deployed in cloud environments among geo-distributed data centers. It is a fundamental challenge to solve the data placement problem for data-intensive applications. The key problem is to present the uncertain and random process of data placement appropriately, while significantly reducing the transmission time across data centers and decreasing the frequency of data movement among data centers. In this paper, we introduce a new type of entity called a Virtual Data Agent (VDA) and convert the data placement problem into two mapping processes, namely, mapping from the data set to the virtual data agent and mapping from the virtual data agent to the data center. We propose Cloud model based Data Placement Algorithm with Virtual Data Agent (CDPVDA). Through simulation using real workflow applications, we compare CDPVDA with two typical data placement strategies. The results indicate that CDPVDA could reduce unavoidable overhead in data transmission between the data centers by 5% to 20%.
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