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• W2949174927 abstract "In this paper, we address issues in the design and operation of a Big Active Data Publish Subscribe (BAD Pub/Sub) systems to enable the next generation of enriched notification systems that can scale to societal levels. The proposed BAD Pub/Sub system will aim to ingest massive amounts of data from heterogeneous publishers and sources and deliver customized, enriched notifications to end users (subscribers) that express interests in these data items via parameterized channels. To support scalability, we employ a hierarchical architecture that combines a back-end big data cluster (to receive publications and data feeds, store data and process subscriptions) with a client-facing distributed broker network that manages user subscriptions and scales the delivery process. A key aspect of our broker capacity is its ability to aggregate subscriptions from end users to immensely reduce the end to end overheads and loads. The skewed distribution of subscribers, their interests and the dynamic nature of societal scale publications, create load imbalance in the distributed broker network. We mathematically formulate the notion of broker load in this setting and derive an optimization problem to minimize the maximum load (an NP-hard problem). We propose a staged approach for broker load balancing that executes in multiple stages --- initial placement of brokers to subscribers, dynamic subscriber migration during operation to handle transient and instantaneous loads and occasional shuffles to re-stabilize the system. We develop a prototype implementation of our staged load balancing on a real BAD Pub/Sub testbed (multinode cluster) with a distributed broker network and conduct experiments using real world workloads. We further evaluate our schemes via a detailed simulation studies." @default.
• W2949174927 created "2019-06-27" @default.
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• W2949174927 date "2019-06-24" @default.
• W2949174927 modified "2023-10-18" @default.
• W2949174927 title "Multistage Adaptive Load Balancing for Big Active Data Publish Subscribe Systems" @default.
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• W2949174927 doi "https://doi.org/10.1145/3328905.3329508" @default.
• W2949174927 hasPublicationYear "2019" @default.
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