Time/Place

This meeting is a hybrid teleconference and IRC chat. Anyone is welcome to join...here's the info:

Attendees 

Agenda

  1. Still time to participate in the Fedora Value Proposition brainstorming
  2. Concurrency control options with lack of strong ETags
    1. If-Unmodified-Since has only second precision
    2. Use cases would be nice to determine common need
  3. Import/Export pre-planning
  4. Linked Data Notifications

  5. Status of "in-flight" tickets

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Ticket Summaries

  1. Please squash a bug!

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  2. Tickets resolved this week:

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  3. Tickets created this week:

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Minutes

  1. Still time to participate in the Fedora Value Proposition brainstorming
    • The Fedora Value Proposition brainstorming exercise will close within the week.  Please take a look and add your comments.

  2. Concurrency control options with lack of strong ETags

    • Background discussion: Strong ETags are desired, but RDF doesn't allow us to make those guarantees. We had planned to use If-Unmodified-Since: headers, but those have limited granularity of one second. At least one site has a use case for a better solution. Jim Coble said that Duke might depending on the direction that Hydra goes.

    • LDP standards are heading towards using If-Unmodified-Since: . We may still need to make better guarantees in Fedora.

    • There were several proposals about how to deal with this issue:

      • Use a local header (e.g. X-If-Weak-Match:) with weak ETag contents but different semantics

      • Use higher precision dates in If-Unmodified-Since. HTTP/1.1 forbids using a different time format.

      • Solve the problem in clients by having them modify their behavior to strip out the weak identifier.

        • There was discussion of how stable this option will be. It will work for now, but might break in the future.

        • ETags allow this behaviour since only the ID is opaque, not the weakness indicator.

      • Use properly formatted If-Unmodified-Since:, but don't have the timestamps reflect actual time, but instead mapped from a better counter.

        • Clients need to know that they can rely on this, but would not require special processing of the header on the clients.

        • Fedora would need additional work to generate the header. The amount of work required is unknown.

      • (also mentioned on IRC) HEAD requests could return strong ETags. Clients most often send HEAD requests first. It may not be allowed for HEAD requests to return different headers.

    • n.b. All of the proposed solutions require clients to be aware of the Fedora specific behavior.

    • Conclusion:

      • The LDP spec will change to support the use of If-Unmodified-Since:. For use cases where that is not good enough, clients can treat weak ETags as strong.

      • Other options should continue to be explored as needed.

      • We would like the improve how ETags are generated

        • Danny will open a ticket about this.

  3. Import/Export Sprint Nick Ruest

    • Starts at 11:00 EDT, Monday, August 29th.

    • In the first meeting we will talk about Phase one items and assign tasks.

    • A wiki page for the sprint meeting will be created under the Misc. Meeting section of the wiki.

    • The minimal goals for the sprint are the Phase one requirements.

    • The fedora-tech list will be included in discussions, so that those who are not participating in the sprint, but would like to stay abreast

  4. Linked Data Notification

    • Amherst is interested

    • There is a W3C draft standard

    • Fedora currently has various ways to do auditing (e.g. built in audit functionality, sending events to an external triple store, storing events as object in the repository).

    • LDN complements what already exists in Fedora by standardizing an endpoint for seeing notifications.

    • Is there interest from Fedora?

    • Conclusion:

      • This is in line with LDP and what we are doing. Please review the spec and we will talk more next week.

  5. In-flight tickets

 

 

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