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From: SATYANARAYANA NARLAPURAM <satyanarlapuram@gmail.com>
Date: Mon, 25 May 2026 12:01:37 -0700
Message-ID: 
 <CAHg+QDf5PVyFgesBNs1GvOnuk_khoXifo96A7QW1EJ8zhhBxyw@mail.gmail.com>
Subject: Re: [PATCH] Release replication slot on error in SQL-callable slot
 functions
To: shveta malik <shveta.malik@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, Fujii Masao <masao.fujii@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 shveta malik <shvetamalik@gmail.com>
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Hi,

On Mon, May 25, 2026 at 2:58=E2=80=AFAM shveta malik <shveta.malik@gmail.co=
m> wrote:

> On Mon, May 25, 2026 at 12:42=E2=80=AFPM SATYANARAYANA NARLAPURAM
> <satyanarlapuram@gmail.com> wrote:
> >
> > Hi
> >
> > On Fri, May 22, 2026 at 2:16=E2=80=AFAM shveta malik <shveta.malik@gmai=
l.com>
> wrote:
> >>
> >> Thanks for reporting the issue. I could reproduce the same issue with
> >> all these as well:
> >>
> >> pg_logical_slot_peek_changes
> >> pg_logical_slot_get_binary_changes
> >> pg_logical_slot_peek_binary_changes
> >
> >
> > Please find the attached v2 patch that addressed these three cases as
> well.
> >
>
> Thank You for addressuing these cases. A few comments:
>
> 1)
>
> +-- Test 2: session remains usable after the error (MyReplicationSlot
> cleared)
>
> It shoudl be part of 'Test 1' itself and thus should not be named as 'Tes=
t
> 2'
>
> 2)
> --------
> +-- Test 4: copy_replication_slot with max_replication_slots exceeded.
> +-- We reduce max_replication_slots artificially by filling all remaining
> slots.
> +-- Instead, trigger an error by copying to an already-existing name.
> +DO $$
> +BEGIN
> +    PERFORM pg_copy_logical_replication_slot('regression_slot_t3',
> 'regression_slot_t3');
> +EXCEPTION WHEN OTHERS THEN
> +    RAISE NOTICE 'caught: %', SQLERRM;
> +END;
> +$$;
> +-- The original slot must still exist and be usable
> +SELECT count(*) =3D 1 AS orig_slot_ok FROM pg_replication_slots
> +    WHERE slot_name =3D 'regression_slot_t3';
> -----------
>
> I don't think we can hit the Assert with above test (at-least I could
> not). Since creation of slot itself will fail as the slot with
> same-name already exists, MyReplicationSlot will never be set and thus
> Assert will not be hit.  A better testcase will be below which fails
> during LoadOutputPlugin() after slot-creation and MyReplicationSlot is
> set already.
>
> SELECT pg_create_logical_replication_slot('src_slot', 'test_decoding');
>
> DO $$
> BEGIN
> PERFORM pg_copy_logical_replication_slot('src_slot', 'dst_slot',
> false, 'nonexistent_plugin');
> EXCEPTION WHEN others THEN
> RAISE NOTICE 'caught: %', SQLERRM;
> END $$;
>
> SELECT count(*) FROM pg_logical_slot_get_changes('src_slot', NULL, NULL);
>
> 3)
> So overall these are the problematic APIs:
>
> pg_create_logical_replication_slot
> pg_replication_slot_advance
> pg_copy_logical_replication_slot
> pg_logical_slot_peek_binary_changes
> pg_logical_slot_peek_changes
> pg_logical_slot_get_changes
> pg_logical_slot_get_binary_changes
>
> First 3 are are mutually exclusive fixes fow which we have added
> testcases. Last 4 are addressed by fixing common function
> pg_logical_slot_get_changes_guts(). I think we should add a test case
> for at-least any one of these APIs to cover
> pg_logical_slot_get_changes_guts().
>

Thanks for reviewing. Please review the attached v3 patch.

Thanks,
Satya

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<div dir=3D"ltr"><div dir=3D"ltr">Hi,</div><br><div class=3D"gmail_quote gm=
ail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, May 25, =
2026 at 2:58=E2=80=AFAM shveta malik &lt;<a href=3D"mailto:shveta.malik@gma=
il.com">shveta.malik@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex">On Mon, May 25, 2026 at 12:42=E2=80=AFPM SATY=
ANARAYANA NARLAPURAM<br>
&lt;<a href=3D"mailto:satyanarlapuram@gmail.com" target=3D"_blank">satyanar=
lapuram@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt; Hi<br>
&gt;<br>
&gt; On Fri, May 22, 2026 at 2:16=E2=80=AFAM shveta malik &lt;<a href=3D"ma=
ilto:shveta.malik@gmail.com" target=3D"_blank">shveta.malik@gmail.com</a>&g=
t; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Thanks for reporting the issue. I could reproduce the same issue w=
ith<br>
&gt;&gt; all these as well:<br>
&gt;&gt;<br>
&gt;&gt; pg_logical_slot_peek_changes<br>
&gt;&gt; pg_logical_slot_get_binary_changes<br>
&gt;&gt; pg_logical_slot_peek_binary_changes<br>
&gt;<br>
&gt;<br>
&gt; Please find the attached v2 patch that addressed these three cases as =
well.<br>
&gt;<br>
<br>
Thank You for addressuing these cases. A few comments:<br>
<br>
1)<br>
<br>
+-- Test 2: session remains usable after the error (MyReplicationSlot clear=
ed)<br>
<br>
It shoudl be part of &#39;Test 1&#39; itself and thus should not be named a=
s &#39;Test 2&#39;<br>
<br>
2)<br>
--------<br>
+-- Test 4: copy_replication_slot with max_replication_slots exceeded.<br>
+-- We reduce max_replication_slots artificially by filling all remaining s=
lots.<br>
+-- Instead, trigger an error by copying to an already-existing name.<br>
+DO $$<br>
+BEGIN<br>
+=C2=A0 =C2=A0 PERFORM pg_copy_logical_replication_slot(&#39;regression_slo=
t_t3&#39;,<br>
&#39;regression_slot_t3&#39;);<br>
+EXCEPTION WHEN OTHERS THEN<br>
+=C2=A0 =C2=A0 RAISE NOTICE &#39;caught: %&#39;, SQLERRM;<br>
+END;<br>
+$$;<br>
+-- The original slot must still exist and be usable<br>
+SELECT count(*) =3D 1 AS orig_slot_ok FROM pg_replication_slots<br>
+=C2=A0 =C2=A0 WHERE slot_name =3D &#39;regression_slot_t3&#39;;<br>
-----------<br>
<br>
I don&#39;t think we can hit the Assert with above test (at-least I could<b=
r>
not). Since creation of slot itself will fail as the slot with<br>
same-name already exists, MyReplicationSlot will never be set and thus<br>
Assert will not be hit.=C2=A0 A better testcase will be below which fails<b=
r>
during LoadOutputPlugin() after slot-creation and MyReplicationSlot is<br>
set already.<br>
<br>
SELECT pg_create_logical_replication_slot(&#39;src_slot&#39;, &#39;test_dec=
oding&#39;);<br>
<br>
DO $$<br>
BEGIN<br>
PERFORM pg_copy_logical_replication_slot(&#39;src_slot&#39;, &#39;dst_slot&=
#39;,<br>
false, &#39;nonexistent_plugin&#39;);<br>
EXCEPTION WHEN others THEN<br>
RAISE NOTICE &#39;caught: %&#39;, SQLERRM;<br>
END $$;<br>
<br>
SELECT count(*) FROM pg_logical_slot_get_changes(&#39;src_slot&#39;, NULL, =
NULL);<br>
<br>
3)<br>
So overall these are the problematic APIs:<br>
<br>
pg_create_logical_replication_slot<br>
pg_replication_slot_advance<br>
pg_copy_logical_replication_slot<br>
pg_logical_slot_peek_binary_changes<br>
pg_logical_slot_peek_changes<br>
pg_logical_slot_get_changes<br>
pg_logical_slot_get_binary_changes<br>
<br>
First 3 are are mutually exclusive fixes fow which we have added<br>
testcases. Last 4 are addressed by fixing common function<br>
pg_logical_slot_get_changes_guts(). I think we should add a test case<br>
for at-least any one of these APIs to cover<br>
pg_logical_slot_get_changes_guts().<br></blockquote><div><br></div><div>Tha=
nks for reviewing. Please review the attached v3 patch.</div><div><br></div=
><div>Thanks,</div><div>Satya=C2=A0</div></div></div>

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