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INFORMATION SERVICES: R-GMA

INFORMATION SERVICES: R-GMA. Abdeslem Djaoui RAL Laurence Field RAL Steve Fisher RAL James Magowan IBM Gavin McCance Glasgow Manfred Oevers IBM. http://hepunx.rl.ac.uk/grid/wp3. Consumer. lookup. Registry. Producer. register.

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INFORMATION SERVICES: R-GMA

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  1. INFORMATION SERVICES: R-GMA Abdeslem Djaoui RAL Laurence Field RAL Steve Fisher RAL James Magowan IBM Gavin McCance Glasgow Manfred Oevers IBM http://hepunx.rl.ac.uk/grid/wp3

  2. Consumer lookup Registry Producer register Relational Grid Monitoring Architecture R-GMA • We use it not only for monitoring but also as the basis of an information system • We have chosen a relational implementation

  3. Relational Approach to Information services • Not a general distributed RDBMS system, but a way to use the relational model in a distributed environment where Atomicity, Consistency, Isolation and Durability (ACID) properties are not generally important. • Producers:announce: SQL “CREATE TABLE” publish: SQL “INSERT” • Consumers: collect: SQL “SELECT”

  4. DBProducer Servlet DBProducer Producer Servlet Producer Registry Interface Sensor Invocation Information Registry Servlet Consumer Consumer Servlet Application Schema Interface Archiver Servlet Schema Servlet Application Archiver R-GMA components Client side Hidden components

  5. Circular Buffer Wpos Buffer[ ] Rpos,wrapF 1..* 1 execute() Consumer pop() Queue[ ] Streaming Consumer Information Information flow from producers to consumers • execute(): get latest tuple Producer Servlet • setBufferSize(N>0): Stream information • pop(): get head of queue Producer Consumer Servlet

  6. DBProducer • Uses a RDBMS as a buffer to make produced data persistent • Consumer cannot tell the difference • Data inserted like a simple Producer • Can produce more than one table • Cannot stream data RDBMS DBProducer Servlet DBProducer Sensor Code Registry Servlet

  7. Archiver Application Code Archiver Servlet Archiver Consumer Consumer DBProducer Consumer Servlet Consumer Servlet Registry Servlet DBProducer Servlet Producer Servlet Producer Servlet • consumes, archives and produces

  8. Query Planner • to deal with a query which requires combining data at more than one physical location: • split query into sub-queries • send to different producers • combine results • EPSRC funding with Herriot Watt • A new RA starting soon

  9. The user view today (M9 release) • API in both JAVA and C++ • Basic sensors (ie cpuload) for producing information • Integration with MDS: a sensor to query the MDS GRIS and republish information within R-GMA • some basic displays to consume data • demo code to get people started

  10. Next steps • Integration of WP3 strands • Internal improvements to code - QA • Security • Soft state registration - GRRP • Query planner • Distributed schema and registry • Query tools for registry and schema • Investigate SOAP • Address issues of scalability and performance • add NetLogger calls to our code

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