Streaming in a Connected orld Querying and Tracking 在一个互相连接的世界的查询和跟踪流.ppt

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2018-06-19 发布于福建
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Streaming in a Connected orld Querying and Tracking 在一个互相连接的世界的查询和跟踪流.ppt

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Streaming in a Connected orld Querying and Tracking 在一个互相连接的世界的查询和跟踪流

Streaming in a Connected World — Cormode Garofalakis Streaming in a Connected World:Querying and Tracking Distributed Data Streams Streams – A Brave New World IP Network Monitoring Application 24x7 IP packet/flow data-streams at network elements Truly massive streams arriving at rapid rates ATT collects 600-800 Gigabytes of NetFlow data each day. Often shipped off-site to data warehouse for off-line analysis Network Monitoring Queries Real-Time Data-Stream Analysis Must process network streams in real-time and one pass Critical NM tasks: fraud, DoS attacks, SLA violations Real-time traffic engineering to improve utilization Tradeoff communication and computation to reduce load Make responses fast, minimize use of network resources Secondarily, minimize space and processing cost at nodes Sensor Networks Wireless sensor networks becoming ubiquitous in environmental monitoring, military applications, … Many (100s, 103, 106?) sensors scattered over terrain Sensors observe and process a local stream of readings: Measure light, temperature, pressure… Detect signals, movement, radiation… Record audio, images, motion… Sensornet Querying Application Query sensornet through a (remote) base station Sensor nodes have severe resource constraints Limited battery power, memory, processor, radio range… Communication is the major source of battery drain “transmitting a single bit of data is equivalent to 800 instructions” [Madden et al.’02] Data-Stream Algorithmics Model Approximate answers– e.g. trend analysis, anomaly detection Requirements for stream synopses Single Pass: Each record is examined at most once Small Space: Log or polylog in data stream size Small-time: Low per-record processing time (maintain synopses) Also: delete-proof, composable, … Distributed Streams Model Large-scale querying/monitoring: Inherently distributed! Streams physically distributed across remote sitesE.g., stream of UDP packets through subset of edge routers Challenge is “holisti