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Stream processing has become increasingly important with emergence of stream applications such as audio/video surveillance, stock price tracing, and sensor data analysis. A challenging problem is to provide optimal component composition in a distributed stream processing environment. The goal of optimal component composition is to achieve load balancing subject to multiple function, resource, and...
This paper presents a dynamic interval index for fast event matching against a large number of predicate intervals specified by content-based subscriptions. A set of virtual construct intervals (VCIs) are predefined, with a unique ID and an associated ID list. Each predicate interval is decomposed into one or more VCIs, which become activated by the predicate. The predicate ID is then inserted into...
This paper considers the problem of mining closed frequent itemsets over a sliding window using limited memory space. We design a synopsis data structure to monitor transactions in the sliding window so that we can output the current closed frequent itemsets at any time. Due to time and memory constraints, the synopsis data structure cannot monitor all possible itemsets. However, monitoring only frequent...
One major drawback of a RAIDS disk array system is that an update to a data block may involve four disk accesses. Such a high overhead is especially undesirable for workloads with a high update rate. In this paper, we present a dynamic parity grouping (DPG) scheme for efficient parity buffering to reduce the write overhead of a RAID-5 system. In DPG, special parity groups are dynamically created for...
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