Re: [EXTERNAL] Re: Support load balancing in libpq - Mailing list pgsql-hackers

From Jacob Champion
Subject Re: [EXTERNAL] Re: Support load balancing in libpq
Date
Msg-id CAAWbhmhvkjTN2BxpHFEPsvbi=MKSQ2wZEqwZNwODyRh7ZKcd3A@mail.gmail.com
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In response to Re: [EXTERNAL] Re: Support load balancing in libpq  (Maxim Orlov <orlovmg@gmail.com>)
Responses Re: [EXTERNAL] Re: Support load balancing in libpq
List pgsql-hackers
On Wed, Sep 14, 2022 at 7:54 AM Maxim Orlov <orlovmg@gmail.com> wrote:
> For the patch itself, I think it is better to use a more precise time function in libpq_prng_init or call it only
once.
> Thought it is a special corner case, imagine all the connection attempts at first second will be seeded with the
save
> value, i.e. will attempt to connect to the same host. I think, this is not we want to achieve.

Just a quick single-issue review, but I agree with Maxim that having
one PRNG, seeded once, would be simpler -- with the tangible benefit
that it would eliminate weird behavior on simultaneous connections
when the client isn't using OpenSSL. (I'm guessing a simple lock on a
global PRNG would be less overhead than the per-connection
strong_random machinery, too, but I have no data to back that up.) The
test seed could then be handled globally as well (envvar?) so that you
don't have to introduce a debug-only option into the connection
string.

Overall, I like the concept.

--Jacob



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