CERN Accelerating science

Published Articles
Title	HTTP as a Data Access Protocol: Trials with XrootD in CMS’s AAA Project
Author(s)	Balcas, J (Caltech) ; Bockelman, B P (Nebraska U.) ; Kcira, D (Caltech) ; Newman, H (Caltech) ; Vlimant, J (Caltech) ; Hendricks, T W (Caltech)
Collaboration	CMS
Publication	2017
Number of pages	8
In:	J. Phys.: Conf. Ser. 898 (2017) 062042
In:	22nd International Conference on Computing in High Energy and Nuclear Physics, CHEP 2016, San Francisco, Usa, 10 - 14 Oct 2016, pp.062042
DOI	10.1088/1742-6596/898/6/062042
Subject category	Computing and Computers
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	The main goal of the project to demonstrate the ability of using HTTP data federations in a manner analogous to the existing AAA infrastructure of the CMS experiment. An initial testbed at Caltech has been built and changes in the CMS software (CMSSW) are being implemented in order to improve HTTP support. The testbed consists of a set of machines at the Caltech Tier2 that improve the support infrastructure for data federations at CMS. As a first step, we are building systems that produce and ingest network data transfers up to 80 Gbps. In collaboration with AAA, HTTP support is enabled at the US redirector and the Caltech testbed. A plugin for CMSSW is being developed for HTTP access based on the DaviX software. It will replace the present fork/exec or curl for HTTP access. In addition, extensions to the XRootD HTTP implementation are being developed to add functionality to it, such as client-based monitoring identifiers. In the future, patches will be developed to better integrate HTTP-over-XRootD with the Open Science Grid (OSG) distribution. First results of the transfer tests using HTTP are presented in this paper together with details about the initial setup.
Copyright/License	publication: (License: CC-BY-3.0)

Corresponding record in: Inspire