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dQUOB: SQL queries over data streams

Q M. Peachtree City, GA. Q N. Streamed sweep data. archive. dispatcher. archive. Query scripts. Grier, SC. Archived sweep data. repository. dQUOB notification service. Hytop, AL. Transform, Filter, Aggregate. time. R:. …. l. k. j. i. h. g. f. e. d. c. b. a.

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dQUOB: SQL queries over data streams

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  1. QM Peachtree City, GA QN Streamed sweep data archive dispatcher archive Query scripts Grier, SC Archived sweep data repository dQUOB notification service Hytop, AL Transform, Filter, Aggregate time R: … l k j i h g f e d c b a event channel S: … 5 4 3 2 1 consumer provider quoblet discards raw Level 2 data Beth PlaleIndiana University dQUOB:SQL queries over data streams Motivating Application: Linked Environments for Atmospheric Discovery (LEAD) NEXRAD Doppler radar data streamed and transformed, filtered, or aggregated for real-time use. dQUOB Queries execute continuously – upon arrival of every event. Queries implemented as DAG of operators (selects, projects, and joins) Problem: asynchronous streams; stream S is slow and erratic Unoptimized version: time R: … l k j i h g f e d c b a … S: 5 4 3 2 1 Approach: express join window as interval of time join window: count Optimized version: join window: 10 sec.

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