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cis6930fa11_SciDB - SciDB RIOT assembly by Morgan Bauer...

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;Sci,* ±² :R17O<T³ assembly by Morgan Bauer
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7Outline ● Use Case ● Raison±d²etre of SciDB ● Requirements of SciDB ● System Description ³High Level´ ● Features of SciDB ● RIOT Description µ Comparison
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=Use +ase#" 4L;S;S<T ● Large Synoptic Survey Telescope ● Not built yet¶ expected before end of decade ³~·¸¹°´ ● º»· gigapixel image every ¹¼ seconds ● º¸ terabytes a night ● ·¸¸¶¸¸¸ pictures ³¹»·½ petabytes´ a year ○ vast preponderance of data cannot be human analyzed ● Sensor Data ³·±dimensional´ ○ Must be cooked to be useful ○ many methods of cooking ● Time series ● Celestial ³Spherical´ Coordinates
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?Why' ● Science Workload ○ Standard ○ Data ■ Petabyte V ■ Highly Structured ■ Arrays¶ not tables ○ Different Requirements ■ Complex Analytics ■ Open Source ■ No Overwrite ■ Provenance¶ lineage ■ Uncertainty ± Error bars ■ Version Control
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?Why not :R,*5M;S' ● Explicitly do not cater to scientific workloads ○ No money¶ ¾A zero billion dollar industry¾ ● Wrong data model ○ don²t want a table¶ want arrays¶ ·±¶ º±¶ n±dimensional ● Wrong operators ○ need linear algebra¶ not joins ○ we²ve seen with MADlib¶ that LA in a DB is possible ■ not optimal ● Wrong capabilities ○ nested arrays¶ custom Data types¶ UDFs
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:Requirements ● Open Source ● No Overwrite ● Version Control ● Provenance¶ lineage ● Uncertainty ± Error bars
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7Open ;Source ● Bad experiece with Oracle at LHC ● Unique support requirements ○ multi±decade support for large science projects ○ inability to recompile entire software stack at will ○ difficulties in maintaining closed±source software with large collaborations encompassing tens to hundreds of institutes
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6No 7Overwrite ² >Versioning ● Update±able Arrays ● Never throw data away¶ even when bad ○ Recalculate a new answer¶ save the old for analysis
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