Le 03/11/2015 17:24, Rainer Weikusat a écrit :
Didier Kryn <[email protected]> writes:
I agree with you, and it was the first point in my mail, that the
servers should be able to cope with outages.
That's not a matter of "should": They have to. Even if it's believed
they're just using local IPC[*].
Yes, but let's consider that, maybe, some do not.
However let's not be extremists.
Feel free to consider yourself 'an extremist', ie, someone fighting
(often violently) for a certain policy regardless of reason but please
don't label me in this way: The issue is technical and not political and
the proposed solution doesn't work.
Extremists always have reasons - excellent, according to them. I
sometimes read opinions which I consider as technically extremist. I
would rank in this category the will to impose one single init system,
wether it be systemd or any other, or the will to impose one single text
editor.
If you have taken the word against you, please consider I withdraw
it, because it wasn't my intention. I was just meaning to express my
favour towards a balanced policy. Let me explicite it:
- Encourage authors to make outage-aware servers, which can then be
started in parallel;
- Provide a supervisor able to handle dependencies for the
non-outage-aware, with a trivial readyness notification method.
In most cases this is going to work, because
Time_of_check_to_time_of_use issues do not arise all the time.
That's a property of any problem caused by a race condition: The time
when the latent problem will manifest itself can't (easily) be
predicted.
This is why people have been able to live with sysv-init for many
decades :-)
Le 03/11/2015 20:49, Steve Litt a écrit :
There's an init system called s6-rc that just came out or is just
coming out. From what I understand, it starts stuff sequentially or in
parallel, with very sophisticated process dependency checking
available, and I think it has an extremely simple way for processes to
communicate readiness.
That's exactly what I have in mind :-) And I think it can become
the new reference for start up.
Didier
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