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    CTA Dev Meeting

    → Europe/Zurich
    31/S-028 (CERN)

    31/S-028

    CERN

    30
    Show room on map
    Michael Davis (CERN)
      • 14:00 → 14:10
        CTA Catalogue Schema 10m

        Next CTA Schema Version

        • Version v10 backwards-incompatible changes #1151
        • Most schema changes are now in master
        • Need to add additional foreign key constraints to DISK_INSTANCE table (VO, ARCHIVE_FILE and the 3 mount rules tables)—will be done after Easter. We push back the next release until this is done.

        Schema and software upgrades

        • Last week's tape server crash is better understood : upgrading the schema before upgrading the software led to a NOT NULL constraint violation which caused the tape server to crash.
        • Schema change was not to blame per se, but it exposed a bug where getString was used to read a field which could contain NULL values instead of getOptionalString.
        • This schema change was "backwards compatible" but still broke the software!
        • Need a process to better evaluate dependencies between software changes and schema changes and order of software/schema upgrades.
      • 14:10 → 14:20
        Tape States/Failure Handling/Retry Logic 10m
        • Maintenance process should notify EOS when it cannot requeue a request #1176—fix bug where requests on a DISABLED tape were failed and lost.
        • Add new REPACKING tape state with same logic as DISABLED (see below)
        • Change logic of DISABLED #1170

        Repack

        • New drive state REPACKING has been added to the constraint in the DRIVE_STATE table.
        • Software support will be added by Joao later #1175

        Other tickets relating to retry logic

        We reviewed these last week, can be reviewed again after all of the above has been implemented.

        • #1023 Scheduler retry logic for archive and retrieve
        • #1099 Reasons for tape session failures
      • 14:20 → 14:30
        CTA Release Roadmap 10m

        See CTA Release Roadmap

        Roadmap Status

        • Schema changes
        • Disk system/Disk instance
        • Tape Server Drive/session status
        • Link with XRootD 5
        • Some unit tests not passing with RelWithDebugInfo
        • Clean up git repo #1182

        Deployment Schedule

        • Release 4.6.1-1 / DB schema v4.6 has been deployed in production
        • w/c 11/04/2022 is a short week with some people on holiday
        • w/c 18/04/2022 : freeze master for release 4.7 / DB schema v10.0
        • w/c 25/04/2022 : deploy v4.7 in PPS
        • w/c 2/05/2022 : deploy v4.7 in Production
      • 14:30 → 14:40
        CASTOR to CTA Migration 10m

        CASTOR clean-up tasks #677

        • 30 million 0-length files to be imported to EOSCTA public instances
        • CASTOR monitoring shows 87.5 million files (53.7 TB) left in CASTOR
        • Files migrated to CERNBox have been deleted.
        • Vlado to move supply tapes etc. to CTA
        • Giuseppe to eventually remove CERNBox files from Hadoop tapes in the r_backup pool so they can be repacked. (No deadline has been set).
      • 14:40 → 14:50
        AOB 10m
        • George's request that we grant access to tapeoperations-docs.
        • Richard's presentation of the reconciliation dashboards.