Abstract
Grid information systems enable the discovery of resources in a grid computing infrastructure and provide further information about their structure and state. The original concepts for a grid information system were defined over 20 years ago and the GLUE 2.0 information model specification was published 10 years ago. This contribution describes the current status and highlights the changes over the years. It provides an overview of today’s usage from analysing the system logs and compares this with results from over a decade ago. A critical analysis of the system is provided with lessons learned and some perspectives for the future.
Highlights
The CHEP 2019 conference represents the 20 year milestone since the introduction of grid computing to HEP
Following the CHEP 2000 conference, a series of development projects were launched to prototype grid computing for the LHC and all were based on the Globus toolkit [2] from the Globus project
These could be queried using the Grid Resource Information Protocol (GRIP) and discovered as the GRIP endpoints were registered to indexes using the Grid Resource Registration Protocol (GRRP) [4]
Summary
The CHEP 2019 conference represents the 20 year milestone since the introduction of grid computing to HEP. The MDS implementation adopted the standard Lightweight Directory Access Protocol (LDAP) [8] for the GRRP transport mechanism, with GRRP messages mapped onto LDAP add operations of the standard LDAP protocol, and for the GRIP, where it is used to define the data model, query language, and transport protocol. This choice of LDAP was made for pragmatic reasons in order to simplify development and it was thought at the time that due to the widespread use of the LDAP data formats would be familiar to developers and system administrators [5]. These changes resulted in a data shipping approach being adopted whereby the data is obtained from the lower level by querying for all information
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