1. 1 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Michael Koch, Markus Hillenbrand, and Paul Müller AINA 2009 May 26-29, 2009 - Bradford, UK Dr. Markus Hillenbrand University of Kaiserslautern, Germany Integrated Communication Systems Lab, ICSY e-mail: hillenbr@informatik.uni-kl.de

2. 2 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Outline Database Virtualisation What is the Venice Service Grid? –Overview –Top Level View –Architecture The Venice Generic Database Web service –Interface and strong data typing –Rights management –SOAP-JDBC Bridge –Splitting of result sets –Evaluation Conclusion and Outlook

3. 3 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Database Virtualisation Diverse data sources in Grid environments –Heterogeneous data schemas –Located in different domains –Varying security policies and firewalls Client applications in Grid environments need –Fast and easy-to-use data access within the service federation –Transparency: location, security, schema, implementation Solution: Virtualisation –Layer between data source and client –Uniform, standardised access methods –Reduces overhead and complexity on the client side Service federation Data Source Virtualisation Client AClient B

4. 4 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Outline Database Virtualisation What is the Venice Service Grid? –Overview –Top Level View –Architecture The Venice Generic Database Web service –Interface and strong data typing –Rights management –SOAP-JDBC Bridge –Splitting of result sets –Evaluation Conclusion and Outlook

5. 5 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid What is the Venice Service Grid? A software infrastructure: –Based on a service-oriented architecture (SOA) –With focus on openness, dependability and security –Service deployment on the Internet A set of services: –Service management at runtime –Service information and access –Service collaboration and communication –Services for building applications upon A runtime environment: –For service development and deployment –For client development and service access

6. 6 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Top Level View of Venice Service providers are –Independent –Autonomous Service requestors –Have a home domain –Can use services of other domains Venice is responsible for –Mutual authentication –Distributed authorization –Service brokering –Service access

7. 7 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Architectural Overview

8. 8 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Web Service Technology Off-the-shelf products –Tomcat 5 and 6 (Service container) –Axis 1 (SOAP engine) –WSDL4Java –Additional tools as needed Tasks –WSDL handling –Data type conversion –HTTPS / certificates –Service deployment

9. 9 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Abstraction Layer Hides Web service technology Solely uses URIs for –Identifying and –Accessing Web services Dynamic invocation (no stubs) Provides the Venice Service Compiler Functionality addressed –Security –URI to WSDL handling –Data collection –Service access

10. 10 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Service Infrastructure Three service categories –Management services –Information services –Common application services Most important services: –Single Sign-on (SSO) –Domain Information –Information Broker –Notification Framework –Presence Framework –Communication Services –Data Management Services → Database Service

11. 11 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Application Domains Use underlying services Add specific functionality Voice over IP –Telephone services –SIP and H.323 –Supplementary services E-Science –Call for Papers –GraphViz –TimeKeeper

12. 12 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Outline Database Virtualisation What is the Venice Service Grid? –Overview –Top Level View –Architecture The Venice Generic Database Web service –Interface and strong data typing –Rights management –SOAP-JDBC Bridge –Splitting of result sets –Evaluation Conclusion and Outlook

13. 13 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid The Venice Generic Database Service Database virtualisation as a new service within Venice –Several services need database support (like Single Sign-on, Information Broker, File System) –Uniform and standardised access to heterogeneous DBMS Features –Accurately defined interface with strong data typing (XML schema) –Rights management with Venice SSO –Intuitive JDBC-like API –Splitting of result sets and parallel transmission

14. 14 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Interface and Strong Data Typing Result sets are –Not predictable in advance –Disperse concerning data types, data amount and their combination Comparable tools (e.g. OGSA-DAI) use canonical XML documents –Storage of almost every data output –No type coercion and restrictions possible: large security hole –Client application has to analyse the document structure –The interface cannot describe how to handle these documents Strong data typing –Interface and SOAP messages accurately defined by XML schema –Every data type is specified –Message includes metadata of the query and its result set –Transparent and secure usage

15. 15 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Rights Management Connects Venice users to the Generic Database Service (GDS)

16. 16 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid SOAP-JDBC Bridge Plain usage of the Database Service –Accurately defined interface is programming language independent –Well-defined data types are beneficial over canonical XML documents –Handling of multi-array XML structures and advanced features is still complex Client-side wrapper system –JDBC-like API for access control and query optimisation –Enables intuitive and transparent usage of the Database Service

17. 17 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Splitting of Result Sets Result set can be too large for the transfer in one message → high latency, server restrictions, slow processing Size of the SOAP document is pre-calculated and split into several messages The SOAP-JDBC-Bridge is able to transfer these in parallel while processing received documents simultaneously → low latency (while still using the same technology) GDS query nextResult PreparedStatement SOAP-JDBC-Bridge ResultSet Thread SOAP messages

18. 18 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Evaluation 14 different data types per row, result set contains 100 rows While 5000 cycles are measured, 80% of the queries only need 350 ms Execution time of a select statement

19. 19 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Summary and Outlook The Venice Service Grid –Abstracts from Web services –Service infrastructure and runtime environment The Venice Generic Database Web Service –Database virtualisation as a service –Accurately defined interface for interoperability, precision, security –Connection of SSO and database security within service federation –SOAP-JDBC Bridge provides an intuitive wrapper system –Splitting results sets enabled efficient data transfer with low latency Outlook –High-performance database access for small queries within Venice –Advanced features like asynchronous query functions and bulk imports

20. 20 Dr. Markus Hillenbrand, ICSY Lab, University of Kaiserslautern, Germany A Generic Database Web Service for the Venice Service Grid Thank you. Questions? http://www.v-grid.info (still under construction)