Managing a job, from submission to completion, usually involves the interaction with several other services: computing elements, storage elements, information systems, data catalogs, authorization, policy and accounting frameworks, credential renewal. Unfortunately their convergence towards standard solutions has not shown fast progress in the past, with the consequence that multiple implementations with different interfaces are available on the same infrastructure. The complexity that stems from this situation is also a major cause of errors. An important goal of the WMS is then to hide as much as possible to end users both the heterogeneity of infrastructure components and the occurence of non-fatal errors, without sacrificing generality and performance during request processing.
In order to ease the integration with higher-level middleware and application frameworks, the WMS itself exposes a Web Service interface compliant with the WS-I specification.
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1. Short overview
The gLite Workload Management System has been designed and developed with the ambition to represent the main access point to the computing resources made available on a Grid. The goal is to provide a reliable, effective and efficient service responsible for the distribution and management of computational jobs, hiding the intrinsic complexity of the infrastructure to its users. The abstraction provided by the WMS is generic enough to support applications coming from largely different domains.
Provide a set of generic keywords that define your contribution (e.g. Data Management, Workflows, High Energy Physics)
Workload Management, interoperability, integration, abstraction, error management
4. Conclusions / Future plans
The WMS has been deployed in a number of different multi-user and multi-VO scenarios, thanks to the neutrality of its design. The recent introduction of features like the bulk match-making has shown that it can cope with sustained high loads. When used in demanding production environments it has nevertheless shown some limits in terms of stability and usability. With the experience gained in the past years, parts of the WMS are now being revised in order to fully comply with the expectations.