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    CernVM-FS and XRootD Coordination meeting

    → Europe/Zurich
    2-R-025 (CERN)

    2-R-025

    CERN
    Radu Popescu (CERN)
    Description

    Coordination meeting for common projects of CernVM-FS and XRootD.

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    HTTP ingestion plugin prototype offers read-only support and can be tested now.

    It can be used with Xcache, using the xrdhttppss development branch of XRootD.

    The test script http://www.slac.stanford.edu/~abh/testxrd can be used to exercise different aspects of the plugin, such as VectorRead

    A stress test for Xcache with HTTP ingestion should be performed: running Xcache on a bare-metal machine with many cores (16-24) and performing a CVMFS repository replication process through it. PSS uses multi-threading by default, but these settings can be modified. Radu will run the tests.

    XrdCl PR to enable HTTP protocol - since the client is a user-facing component, HTTP must be off by default. HTTP should be accepted as a valid protocol only if the user explicitly enables it in the configuration files.

    For solving the problem of reloading CVMFS manifests after their TTL expires, or on demand, a new context management plugin should be developed. Andy and Wei will be working on this.

    Next meeting is planned for June 6th, 17:00 CET.

    There are minutes attached to this event. Show them.
      • 17:00 → 17:15
        Current state of HTTP ingestion plugin for XRootD 15m

        A quick summary of the current state of the HTTP ingestion plugin for XRootD

        Speaker: Radu Popescu (CERN)
        XRootD HTTP Ingestion Plugin.pdf
      • 17:15 → 17:30
        Integration of the HTTP ingestion plugin with the Proxy Storage Services 15m

        Discussion on how to integrate the HTTP ingestion plugin with the Proxy Storage Services components.

        • The HTTP ingestion plugin is not part of the core; how can HTTP be conditionally enabled throughout the "pipeline"?
        • Integration work is happening on the "xrdhttppss" branch
        • Cache invalidation plugin
      • 17:30 → 17:45
        URL renaming plugin 15m

        A short overview of the URL renaming plugin.

        • Can it be used to integrate the HTTP ingestion plugin with the rest of XRootD?
        • Are there performance/robustness issues to keep in mind?
      • 17:45 → 18:00
        Any other business 15m