C-JDBC:Expandable Database Clustering Middleware
Clusters had been successfully used in the n-tiers structure software,but it lacks such cluster tools in the side of backend databases.So a lot of more expensive hardware are required if the database tier becomes the bottleneck.Clustered JDBC(C-JDBC) addresses before-mentioned problems.C-JDBC presented a single virtual database to the application through the JDBC interface.It does not require any modification to applications which based on database that provides the JDBC drivers.The flexible architecture of C-JDBC supports large and complex database cluster architectures,offering various perfor-mance,fault tolerance and usability.
We present here a study for a scheduler which cooperates with the queueing system TORQUE and is tailored to the needs of a HEP-dominated large Grid site with around 10000 jobs slots. Triggered by severe scaling problems of MAUI, a scheduler, referred to as MYSCHED, was developed and put into operation. We discuss conceptional aspects as well as experiences after almost two years of running.