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A-REX / ARC CE Status and Plans

A-REX / ARC CE Status and Plans. Oxana Smirnova Lund University EMI All-hands meeting 30 May 2011, Lund, Sweden. ARC computing service in a nutshell. Data staging module. Job session directory. GridFTP interface. Job processor (Grid Manager). A-REX (WS) interface. Information providers.

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A-REX / ARC CE Status and Plans

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  1. A-REX / ARC CEStatus and Plans Oxana Smirnova Lund University EMI All-hands meeting30 May 2011, Lund, Sweden

  2. ARC computing service in a nutshell Data staging module Job session directory GridFTP interface Job processor(Grid Manager) A-REX (WS) interface Information providers LRMS back-ends LDAP interface LRMS and Operating System EMI All-hands, Lund

  3. What’s new in EMI-1 - summary • Completely re-factored job processor: accommodates for A-REX, among others • Is now in production • Old Grid Manager reached End-of-Life • Load balancing (“ARC-CE HA”) • Brand new data staging framework • Turned off by default in order not to affect production sites • Essentially, an internal file transfer service • Support for Glue2 (LDAP) • XML rendering defined • Some others (not in the scheme): • Janitor dependency on Redland RDF libraries removed • ARGUS plugin • crl-update replaced with fetch-crl EMI All-hands, Lund

  4. Interfaces still used in production • GridFTP interface • Job submission and control • Access to session directory • Fine-grained authorization using legacy ARC groups • Can be transparently phased out • LDAP interface • NorduGrid, Glue1.3 (and now GLUE2) information schemas • Information about service • Information about jobs • Coarse-grained information about authorization – VOs and gridmaps • Difficult to phase out as WLCG explicitly relies on it EMI All-hands, Lund

  5. New WS Interface • A-REX • Job submission and control • Access to session directory • GLUE2 XML information schema (pre-standard) • Information about services • Information about jobs • Fine-grained authorization • gridmaps • ARC authorization policies • GACL for per-job access control • Incomplete XACML support • Legacy groups – work in progress EMI All-hands, Lund

  6. Objectives - 2011 • Definition of a common SAML profile all over the middleware stacks: in progress • Publish coherent GLUE2.0 version information: done in LDAP, to do in XML • Agreement on UR: in progress • Nagios probes: WLCG ones exist, few more in the pipeline • Adhere to OS standards for service operation and control: done • Integration of the compute area services with the ARGUS authorization framework: ARGUS plugin exists, XACML profile yet to be implemented • Interactive access to CE: access to job session directory is in place • Common parallel execution framework: shown to work via RunTime Environment • Implementation of the EMI-ES interface: in progress • Interface to batch systems: framework finalized, all relevant batch systems interfaced EMI All-hands, Lund

  7. Objectives - 2012 • Implement common data library (relevant for ARC-CE): todo • Implement UR: todo • Support on SL6, Debian 6 and latest Ubuntu: Debian 6, RH6, Ubuntu 11.04 are supported already • Introduce minimal DOS protection via configurable resource limits: all conceivable limits are in place already • Replace GSI with TLS/SSL: done in A-REX; common delegation - todo • Semi-automated configuration of service backends: todo • Implement the EMI cloud strategy within compute area: todo • Complete the rewrite of components utilising the new AuthNlibraries: todo • Increase performance of EMI services: in progress EMI All-hands, Lund

  8. Objectives - 2013 • Multi-core jobs on new architectures (FPGAs, GPGPUs etc): todo • Investigate instrumentation tools: todo • Implement extensions for new architectures: todo EMI All-hands, Lund

  9. Conclusion • Good list of well-defined tasks • Some are not well defined yet, expect them to be improved • Good progress • Large picture is still blurry • Suppose a site wants to replace old LCG-CE with an ARC-CE – are we ready? • Where are we w.r.t. clients? • Where is Grid? EMI All-hands, Lund

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