An integrated overview of metadata in ATLAS

Abstract : Metadata--data about data--arise in many contexts, from many diverse sources, and at many levels in ATLAS. Familiar examples include run-level, luminosity-block-level, and event-level metadata, and, related to processing and organization, dataset-level and file-level metadata, but these categories are neither exhaustive nor orthogonal. Some metadata are known a priori, in advance of data taking or simulation; other metadata are known only after processing--and occasionally, quite late (e.g., detector status or quality updates that may appear after Tier 0 reconstruction is complete). Metadata that may seem relevant only internally to the distributed computing infrastructure under ordinary conditions may become relevant to physics analysis under error conditions ("What can I discover about data I failed to process?"). This talk provides an overview of metadata and metadata handling in ATLAS, and describes ongoing work to deliver integrated metadata services in support of physics analysis.
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Conference papers
J. Gruntorad ; M. Lokajicek. 17th International Conference on Computing in High Energy and Nuclear Physics (CHEP09), Mar 2009, Prague, Czech Republic. IOP Publishing, 219, pp.042009, <10.1088/1742-6596/219/4/042009>


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Contributor : Emmanuelle Vernay <>
Submitted on : Thursday, April 30, 2009 - 1:00:04 PM
Last modification on : Tuesday, May 18, 2010 - 11:00:08 AM

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E. Gallas, S. Albrand, R. Hawkings, D. Malon, E. Torrence. An integrated overview of metadata in ATLAS. J. Gruntorad ; M. Lokajicek. 17th International Conference on Computing in High Energy and Nuclear Physics (CHEP09), Mar 2009, Prague, Czech Republic. IOP Publishing, 219, pp.042009, <10.1088/1742-6596/219/4/042009>. <in2p3-00380203>

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