Stream schema: providing and exploiting static metadata for data stream processing
Proceedings of the 13th International Conference on Extending Database Technology
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Data Stream Management Systems (DSMS) are gaining acceptance for applications that need to process very large volumes of data in real time. The load generated by such applications frequently exceeds by far the computation capabilities of a single centralized server. In particular, a single-server instance of our DSMS, Gigascope, cannot keep up with the processing demands of the new OC-786 networks, which can generate more than 100 million packets per second. In this paper, we explore a mechanism for the distributed processing of very high speed data streams. Existing distributed DSMSs employ two mechanisms for distributing the load across the participating machines: partitioning of the query execution plans and partitioning of the input data stream in a query-independent fashion. However, for a large class of queries, both approaches fail to reduce the load as compared to centralized system, and can even lead to an increase in the load. In this paper we present an alternative approach - query-aware data stream partitioning that allows for more efficient scaling. We have developed methods for analyzing any given query node to determine a partition strategy, reconcile potentially conflicting requirements that different queries in a query set place on partitioning, and to choose an optimal partitioning which minimizes overall communication costs.