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 <CACeKOO3KF9ZdhkvgM+znSaj6dkTyMR77xCebQk9iuTfVavkYbA@mail.gmail.com>
 <20250821.192332.768193620076940871.ishii@postgresql.org>
 <CACeKOO000N8gUodkXt_1V=XQYx_utxXdyOxkzV7GYSPpdHnTfg@mail.gmail.com>
 <20250825.111825.1765418484481637087.ishii@postgresql.org>
In-Reply-To: <20250825.111825.1765418484481637087.ishii@postgresql.org>
From: Nadav Shatz <nadav@tailorbrands.com>
Date: Mon, 25 Aug 2025 15:50:58 +0300
Message-ID: 
 <CACeKOO3cgZFAWw_tJ5CtjQt4NSiw4ORz-uTUJW5Zq2CxHWuiFw@mail.gmail.com>
Subject: Re: Proposal: recent access based routing for primary-replica setups
To: Tatsuo Ishii <ishii@postgresql.org>
Cc: pgpool-hackers@lists.postgresql.org
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Hi Tatsuo,

Thank you for the notes - please find attached an updated version.

What do you think?

Thanks,

On Mon, Aug 25, 2025 at 5:18=E2=80=AFAM Tatsuo Ishii <ishii@postgresql.org>=
 wrote:

> Hi Nadav,
>
> Thank you for the patch!
>
> I have one question. How do you provide a password (sr_check_password)
> while executing replication_delay_source_cmd as sr_check_user? In my
> understanding replication_delay_source_cmd is executed through su
> command in your patch. In this case su command tries to read the
> password from terminal. I don't see such a code in the patch.
>
> BTW, I start to think that executing replication_delay_source_cmd as
> sr_check_user might not be a good idea. sr_check_user is a database
> user, not OS user. In PostgreSQL they are not necessarily the
> same. Also doing su in pgpool process needs to be very carefully to
> avoid vulnerability. Probably we just execute it as pgpool OS user?
>
> Lastly when I apply the patches using git apply, there are some
> trailing space errors.
>
> $ git apply ~/external-lag-feature-implementation.patch
> /home/t-ishii/external-lag-feature-implementation.patch:314: trailing
> whitespace.
>
> /home/t-ishii/external-lag-feature-implementation.patch:317: trailing
> whitespace.
>
> /home/t-ishii/external-lag-feature-implementation.patch:318: trailing
> whitespace.
>                         cmd_len =3D strlen(escaped_cmd) +
> /home/t-ishii/external-lag-feature-implementation.patch:320: trailing
> whitespace.
>
> /home/t-ishii/external-lag-feature-implementation.patch:322: trailing
> whitespace.
>                         snprintf(full_command, cmd_len, "su - %s -c '%s'"=
,
> warning: squelched 4 whitespace errors
> warning: 9 lines add whitespace errors.
>
> $ git apply ~/external-lag-feature-tests.patch
> /home/t-ishii/external-lag-feature-tests.patch:87: trailing whitespace.
> - test_parsing.sh: Unit test for parsing logic
> /home/t-ishii/external-lag-feature-tests.patch:440: trailing whitespace.
> # Test 2: Float values
> warning: 2 lines add whitespace errors.
>
> Also I have some compilation errors after patching the source
> code. See attached compilation log.
>
> Best regards,
> --
> Tatsuo Ishii
> SRA OSS K.K.
> English: http://www.sraoss.co.jp/index_en/
> Japanese:http://www.sraoss.co.jp
>


--=20
Nadav Shatz
Tailor Brands | CTO

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<div dir=3D"ltr">Hi=C2=A0Tatsuo,<div><br></div><div>Thank you for the notes=
 - please find attached an updated version.</div><div><br></div><div>What d=
o you think?</div><div><br></div><div>Thanks,</div></div><br><div class=3D"=
gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Mon, Aug 25, 2025 at 5:18=E2=80=AFAM Tatsuo Ishii &lt;<a href=3D"mailto:is=
hii@postgresql.org">ishii@postgresql.org</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex">Hi Nadav,<br>
<br>
Thank you for the patch!<br>
<br>
I have one question. How do you provide a password (sr_check_password)<br>
while executing replication_delay_source_cmd as sr_check_user? In my<br>
understanding replication_delay_source_cmd is executed through su<br>
command in your patch. In this case su command tries to read the<br>
password from terminal. I don&#39;t see such a code in the patch.<br>
<br>
BTW, I start to think that executing replication_delay_source_cmd as<br>
sr_check_user might not be a good idea. sr_check_user is a database<br>
user, not OS user. In PostgreSQL they are not necessarily the<br>
same. Also doing su in pgpool process needs to be very carefully to<br>
avoid vulnerability. Probably we just execute it as pgpool OS user?<br>
<br>
Lastly when I apply the patches using git apply, there are some<br>
trailing space errors.<br>
<br>
$ git apply ~/external-lag-feature-implementation.patch <br>
/home/t-ishii/external-lag-feature-implementation.patch:314: trailing white=
space.<br>
<br>
/home/t-ishii/external-lag-feature-implementation.patch:317: trailing white=
space.<br>
<br>
/home/t-ishii/external-lag-feature-implementation.patch:318: trailing white=
space.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 cmd_len =3D strlen(escaped_cmd) + <br>
/home/t-ishii/external-lag-feature-implementation.patch:320: trailing white=
space.<br>
<br>
/home/t-ishii/external-lag-feature-implementation.patch:322: trailing white=
space.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 snprintf(full_command, cmd_len, &quot;su - %s -c &#39;%s&#39;&qu=
ot;, <br>
warning: squelched 4 whitespace errors<br>
warning: 9 lines add whitespace errors.<br>
<br>
$ git apply ~/external-lag-feature-tests.patch <br>
/home/t-ishii/external-lag-feature-tests.patch:87: trailing whitespace.<br>
- test_parsing.sh: Unit test for parsing logic=C2=A0 <br>
/home/t-ishii/external-lag-feature-tests.patch:440: trailing whitespace.<br=
>
# Test 2: Float values=C2=A0 <br>
warning: 2 lines add whitespace errors.<br>
<br>
Also I have some compilation errors after patching the source<br>
code. See attached compilation log.<br>
<br>
Best regards,<br>
--<br>
Tatsuo Ishii<br>
SRA OSS K.K.<br>
English: <a href=3D"http://www.sraoss.co.jp/index_en/" rel=3D"noreferrer" t=
arget=3D"_blank">http://www.sraoss.co.jp/index_en/</a><br>
Japanese:<a href=3D"http://www.sraoss.co.jp" rel=3D"noreferrer" target=3D"_=
blank">http://www.sraoss.co.jp</a><br>
</blockquote></div><div><br clear=3D"all"></div><div><br></div><span class=
=3D"gmail_signature_prefix">-- </span><br><div dir=3D"rtl" class=3D"gmail_s=
ignature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"rtl"><div dir=
=3D"ltr"><font color=3D"#000000">Nadav Shatz</font></div><div dir=3D"ltr"><=
font color=3D"#000000">Tailor Brands=C2=A0| CTO</font></div></div></div></d=
iv></div></div>

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