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Re: Journald's qualities

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On Fri, Feb 23, 2024 at 10:17 PM The Wanderer <wanderer@fastmail.fm> wrote:
>
> On 2024-02-23 at 15:35, Stefan Monnier wrote:
>
> >>> but what are the advantages of journald's representation compared
> >>> to a naive one?
> >>
> >> in short: querability without text parsing. That's about it.
> >
> > They have to parse the binary format, so that's not in and of itself
> > an upside compared to parsing CSV.
> >
> > I've made my share of bad design decisions that don't pan out. But
> > there's always an upside to my decision (even when it turns out it
> > speeds up only those cases which can never occur, because of some
> > other aspect of the system).
> >
> > AFAICT the format is *not* just a plain sequence of log entries, so
> > there's some additional structure which is intended to speed up some
> > operations.
> >
> > IOW, even if contrived, there should be *some* use case where it
> > does better than CSV, no?
>
> I can think of two possibilities, just offhand, in no particular order:
>
> * No need to parse the timestamps, et cetera, and take the risk that
> someone put in one that's in a format you don't expect; the times are
> stored internally in a consistent guaranteed format, so you can just use
> internal reader functions (paired with, and updated alongside, the
> internal writer functions) and be done with it.
>
> * No need to worry about handling log entries that *contain* commas, or
> whatever other element was chosen as the separator.

Systemd also provides tamper-resistant logs. The property is often
desirable in the enterprise. See Forward Secure Sealing,
<https://lwn.net/Articles/512895/>.

Jeff

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Thread

Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 11:20 +0100
  Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 12:50 +0100
    Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 13:10 +0100
      Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 13:50 +0100
        Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 13:50 +0100
          Re: Selective rotation of journald logs Greg Wooledge <greg@wooledge.org> - 2024-02-23 14:00 +0100
            Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 14:10 +0100
              Re: Selective rotation of journald logs Greg Wooledge <greg@wooledge.org> - 2024-02-23 14:10 +0100
                Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 14:20 +0100
                Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 14:30 +0100
              Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 14:20 +0100
                Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-23 14:30 +0100
                Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 14:40 +0100
          Re: Selective rotation of journald logs Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 14:10 +0100
        Journald's qualities (was: Selective rotation of journald logs) Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-23 16:30 +0100
          Re: Journald's qualities (was: Selective rotation of journald logs) Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-23 18:20 +0100
            Re: Journald's qualities Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-23 21:40 +0100
              Re: Journald's qualities The Wanderer <wanderer@fastmail.fm> - 2024-02-24 01:20 +0100
                Re: Journald's qualities Jeffrey Walton <noloader@gmail.com> - 2024-02-24 05:10 +0100
                Re: Journald's qualities Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-24 11:00 +0100
                Re: Journald's qualities Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-24 05:20 +0100
          Re: Journald's qualities (was: Selective rotation of journald logs) Dan Ritter <dsr@randomstring.org> - 2024-02-23 19:00 +0100
            Re: Journald's qualities Stefan Monnier <monnier@iro.umontreal.ca> - 2024-02-23 21:50 +0100
            Re: Journald's qualities (was: Selective rotation of journald logs) Nicholas Geovanis <nickgeovanis@gmail.com> - 2024-02-23 22:10 +0100
              Re: Journald's qualities (was: Selective rotation of journald logs) Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-24 11:10 +0100
            Re: Journald's qualities (was: Selective rotation of journald logs) Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-24 10:40 +0100
              Re: Journald's qualities Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-02-26 12:20 +0100
                Re: Journald's qualities Mariusz Gronczewski <xani@devrandom.pl> - 2024-02-26 12:40 +0100
                Re: Journald's qualities Jeffrey Walton <noloader@gmail.com> - 2024-02-26 17:10 +0100
                Re: Journald's qualities Anssi Saari <anssi.saari@debian-user.mail.kapsi.fi> - 2024-02-27 10:50 +0100
  Re: Selective rotation of journald logs Max Nikulin <manikulin@gmail.com> - 2024-02-23 16:40 +0100
    Re: Selective rotation of journald logs Max Nikulin <manikulin@gmail.com> - 2024-02-25 04:00 +0100
    Re: Selective rotation of journald logs Nicolas George <george@nsup.org> - 2024-02-26 15:50 +0100

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