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Re: Ensuring in-order execution

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I eventually decided to write something to solve this:

https://changelog.complete.org/archives/10368-fast-ordered-unixy-queues-over-nncp-and-syncthing-with-filespooler

On 2021-11-08, John Goerzen <jgoerzen@complete.org> wrote:
> Hi,
>
> I'm wondering if there are any generic programs out there to help ensure
> in-order execution.
>
> My particular use case: sending incremental backups over NNCP, though this is
> the same problem as sending them over UUCP; namely, that nncp-exec/uuxqt aren't
> able to make guarantees about executing commands in order, since they may arrive
> via varying paths, etc.
>
> I've worked around this in a couple of ways:
>
> 1) When using ZFS incrementals, zfs receive detects the out of order situation
> and exits with an error.
>
> 2) When using tar or dar incrementals, I keep a "last processed" file on both
> the sender and recipient, and part of the request references the sequence number
> of the previous file, so the wrapper script can verify that before proceeding.
>
> It's this situation #2 that I think must certainly have some generic solution,
> as I keep seeming to reinvent it every few months.  I'm sure that in the earlier
> days of Unix and UUCP, this was a fairly common problem and it seems to me that
> a generic solution must exist, but my searching has been futile so far.
>
> Any ideas welcome.
>
> Thanks,
>
> John

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Ensuring in-order execution John Goerzen <jgoerzen@complete.org> - 2021-11-08 14:53 +0000
  Re: Ensuring in-order execution John Goerzen <jgoerzen@complete.org> - 2022-06-14 17:44 +0000

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