IPP Mail Archive: Re: IPP> Duplicate ippget events

IPP Mail Archive: Re: IPP> Duplicate ippget events

Re: IPP> Duplicate ippget events

From: Marty Joel (mjoel@netreon.com)
Date: Fri Jul 27 2001 - 15:28:42 EDT

  • Next message: Michael Sweet: "Re: IPP> Duplicate ippget events"

    Hi Michael,

    I agree with everything you've said.

    Actually, notify-sequence-number is what should be used by the client to
    ignore duplicates. For each subscription that matches its
    Get-Notifications (usually only 1 subscription), it needs to know that
    subscription ID and the last notify-sequence-number it received. That
    requires very little work on the part of the client.


    Michael Sweet <mike@easysw.com>@pwg.org on 07/27/2001 11:39:42 AM

    Sent by: owner-ipp@pwg.org

    To: Marty Joel <mjoel@netreon.com>
    cc: ipp@pwg.org

    Subject: Re: IPP> Duplicate ippget events

    Marty Joel wrote:
    > ...
    > Actually, the client will receive duplicate events when it polls faster
    > that the event timeout interval (which it must do to not lose events).
    > There's a timestamp in each event, which the client must use to discard
    > duplicates.

    I can foresee some problems with this - the event timestamp is only
    accurate to a second, and I can see many high-speed printers
    generating more than 1 event per second!

    Also, this increases the overhead on the server considerably.

    Michael Sweet, Easy Software Products                  mike@easysw.com
    Printing Software for UNIX                       http://www.easysw.com

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