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In-Reply-To: <20260627.105108.665094997299401916.ishii@postgresql.org>
From: Nadav Shatz <nadav@tailorbrands.com>
Date: Sat, 27 Jun 2026 11:59:51 +0300
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 <CACeKOO27Qr1CeL1Vqo1SWEdhsGhFSaRca4_S7CXfyErcLpzcpg@mail.gmail.com>
Subject: Re: Proposal: Recent mutated table tracking in memory
To: Tatsuo Ishii <ishii@postgresql.org>
Cc: pgpool-hackers@lists.postgresql.org
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Hi Tatsuo,

Thanks for the review. All addressed in v7:

1. Message format strings split across lines
   Restored to single-line strings in is_select_object_in_temp_write_list()
   and every other place in the patch (pool_query_context.c and
   pool_track_table_mutation.c). Long lines are left long; only the
   message strings were rejoined.

2. The large "else if" branch in where_to_send_main_replica()
   Moved into a new static subroutine,
   where_to_send_dml_adaptive_global(), so the routing function stays
   readable. The call site is now just:

     else if (pool_config->disable_load_balance_on_write =3D=3D
              DLBOW_DML_ADAPTIVE_GLOBAL)
     {
         where_to_send_dml_adaptive_global(query_context, query, node,
dest);
     }

3. Copyright year on the two new files
   Changed to "Copyright (c) 2026" in pool_track_table_mutation.c and
   pool_track_table_mutation.h.

4. FNV-1a comment
   Expanded with a short explanation of what FNV-1a is (offset basis +
   per-byte XOR/multiply by the FNV prime, non-cryptographic, good
   dispersion for short keys) and a reference link.

5. get_current_time() wrapper
   Good point -- there was no reason for it. Removed the wrapper and call
   gettimeofday() directly at the call sites.

Attaching the updated single patch:

  v7-0001-Feature-load-balancing-control-by-table-tracking.patch

Builds cleanly and passes the dml_adaptive_global routing tests on a
PG16 streaming-replication cluster.

Thanks!

On Sat, Jun 27, 2026 at 4:51=E2=80=AFAM Tatsuo Ishii <ishii@postgresql.org>=
 wrote:

> Hi Nadav,
>
> > Hi Tatsuo,
> >
> > Sorry -- my wording was misleading. No, unpatched pgpool does NOT have
> > this problem, and you're right that your test shows no hang on master.
> > The hang is entirely in the new code my patch adds, not in pgpool
> > itself.
> >
> > To be precise: the marking code that hung is the dml_adaptive_global
> > branch in handle_query_context() (CommandComplete.c) that my patch
> > introduces. It is gated on disable_load_balance_on_write =3D
> > dml_adaptive_global, which only exists with the patch applied, so maste=
r
> > never runs it.
> >
> > It also doesn't fire for your exact sequence, for two reasons:
> >
> >   1. You ran it on master, which doesn't contain the branch at all.
> >   2. Even on a patched build, your statements are inside an explicit
> >      transaction (BEGIN ... COMMIT), and that branch only runs for
> >      autocommit statements (the "!is_in_transaction" case).
> >
> > What actually hung, on a patched build with dml_adaptive_global set in
> > streaming replication, was a *bare autocommit* statement (no surroundin=
g
> > transaction) whose table OID cannot be served from the relcache -- for
> > example:
> >
> >   DROP TABLE IF EXISTS non_existent_table;     -- no BEGIN/COMMIT
> >
> > Because the name is unresolvable, pool_table_name_to_oid() does not cac=
he
> > it (no_cache_if_zero), so every lookup is a relcache miss. The marking
> > branch calls pool_extract_table_oids() -> ... -> do_query() to resolve
> > the OID, but handle_query_context() runs before the statement's
> > CommandComplete response has been read from the backend, so injecting
> > that query desyncs the protocol and the session blocks. Backtrace:
> >
> >   #2  pool_read2                (blocked in read())
> >   #3  do_query                  "SELECT
> > COALESCE(pg_catalog.to_regclass('...')::oid, 0)"
> >   #4  pool_search_relcache      (relcache miss)
> >   #5  pool_table_name_to_oid
> >   #6  pool_extract_table_oids   query_cache/pool_memqcache.c
> >   #7  handle_query_context      protocol/CommandComplete.c
> >  (!is_in_transaction branch)
> >   #8  CommandComplete
> >
> > This is the same class of issue as the one behind your original review
> > comment: resolving OIDs at CommandComplete time means doing backend I/O
> > while a response is in flight.
> >
> > v6-0001 fixes it for good by resolving the written tables' OIDs (and th=
e
> > database OID) at DML *routing* time -- when the connection is idle and
> > do_query is safe, the same point the feature already resolves OIDs for
> > the SELECT staleness check. handle_query_context() then only marks the
> > already-resolved OIDs and does no backend I/O at all, for both the
> > autocommit and the COMMIT paths.
> >
> > Verified on a PG16 streaming-replication cluster with
> dml_adaptive_global:
> > the bare "DROP TABLE IF EXISTS non_existent_table;" and your
> > "BEGIN; DROP TABLE IF EXISTS ...; COMMIT;" both return promptly, the
> > deferred-constraint COMMIT failure leaves the table unmarked (reads kee=
p
> > load-balancing to the standby), and a successful autocommit or COMMIT
> > write marks the table and forces reads to the primary.
>
> Understood.
>
> > Sorry again for the confusing earlier phrasing.
>
> No problem. Thank you for detailed explanation!
>
> So, my review comments are below. Mostly cosmetic coding style
> suggestions.
>
> diff --git a/src/context/pool_query_context.c
> b/src/context/pool_query_context.c
> index 73bc64338..a7756ec8b 100644
> --- a/src/context/pool_query_context.c
> +++ b/src/context/pool_query_context.c
> @@ -1848,20 +1849,26 @@ is_in_list(char *name, List *list)
>  static bool
>  is_select_object_in_temp_write_list(Node *node, void *context)
>  {
> -       if (node =3D=3D NULL || pool_config->disable_load_balance_on_writ=
e !=3D
> DLBOW_DML_ADAPTIVE)
> +       if (node =3D=3D NULL ||
> +
>  !DLBOW_IS_DML_ADAPTIVE(pool_config->disable_load_balance_on_write))
>                 return false;
>
>         if (IsA(node, RangeVar))
>         {
>                 RangeVar   *rgv =3D (RangeVar *) node;
> -               POOL_SESSION_CONTEXT *session_context =3D
> pool_get_session_context(false);
> +               POOL_SESSION_CONTEXT *session_context;
>
> -               if (pool_config->disable_load_balance_on_write =3D=3D
> DLBOW_DML_ADAPTIVE && session_context->is_in_transaction)
> +               session_context =3D pool_get_session_context(false);
> +
> +               if (session_context->is_in_transaction)
>                 {
>                         ereport(DEBUG1,
> -
>  (errmsg("is_select_object_in_temp_write_list: \"%s\", found relation
> \"%s\"", (char *) context, rgv->relname)));
> +
>  (errmsg("is_select_object_in_temp_write_list:"
> +                                                       " \"%s\", found
> relation \"%s\"",
> +                                                       (char *) context,
> rgv->relname)));
>
> I guess you aimed to shorten the message so that it does not exceed
> line length limit (78). But IMO the rule is not applied to message
> format strings because this kind of style (divide the message line
> into multiple lines) is hard to read. I suggest to restore to former styl=
e.
>
> Same suggestion is applied to all other similar places.
>
> @@ -2169,6 +2275,153 @@ where_to_send_main_replica(POOL_QUERY_CONTEXT
> *query_context, char *query, Node
>                                 {
>
> pool_set_node_to_be_sent(query_context, PRIMARY_NODE_ID);
>                                 }
> +
> +                               /*
> +                                * Check track table mutation for recentl=
y
> written tables.  If
> +                                * in cold start or any table was recentl=
y
> written, route to
> +                                * primary to avoid stale reads.
> +                                */
> +                               else if
> (pool_config->disable_load_balance_on_write =3D=3D
> +                                                DLBOW_DML_ADAPTIVE_GLOBA=
L)
> +                               {
>
> This "else if" branch is too large and hard to read. You should move
> the code of the branch to a subroutine and call it from here.
>
> diff --git a/src/include/utils/pool_track_table_mutation.h
> b/src/include/utils/pool_track_table_mutation.h
> new file mode 100644
> index 000000000..dfbac666d
> --- /dev/null
> +++ b/src/include/utils/pool_track_table_mutation.h
> @@ -0,0 +1,167 @@
> +/* -*-pgsql-c-*- */
> +/*
> + * pgpool: a language independent connection pool server for PostgreSQL
> + * written by Tatsuo Ishii
> + *
> + * Copyright (c) 2003-2026     PgPool Global Development Group
>
> Since this file is new, the Copyright year should be just 2026.
> + * Copyright (c) 2026  PgPool Global Development Group
>
> diff --git a/src/protocol/CommandComplete.c
> b/src/protocol/CommandComplete.c
> index 1f63a0e8d..76e77fea0 100644
> --- a/src/protocol/CommandComplete.c
> +++ b/src/protocol/CommandComplete.c
> diff --git a/src/utils/pool_track_table_mutation.c
> b/src/utils/pool_track_table_mutation.c
> new file mode 100644
> index 000000000..e7771e7bf
> --- /dev/null
> +++ b/src/utils/pool_track_table_mutation.c
> @@ -0,0 +1,902 @@
> +/* -*-pgsql-c-*- */
> +/*
> + * pgpool: a language independent connection pool server for PostgreSQL
> + * written by Tatsuo Ishii
> + *
> + * Copyright (c) 2003-2026     PgPool Global Development Group
>
> Since this file is new, the Copyright year should be just 2026.
> + * Copyright (c) 2026  PgPool Global Development Group
>
> +/* ----------------
> + * Hash functions
> + * ----------------
> + */
> +
> +/*
> + * FNV-1a hash for table/database oid pair
> + */
>
> Can you please add more comments regarding FNV-1a? I'm not sure
> everyone is famimilar with FNV-1a (at lease I am not).
>
> +/*
> + * Get current time
> + */
> +static void
> +get_current_time(struct timeval *tv)
> +{
> +       gettimeofday(tv, NULL);
> +}
>
> Just out of curiosity, why you don't call gettimeofday directly?
>
> 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

--0000000000006bb0f00655387377
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Tatsuo,<br><br>Thanks for the review. All addressed in =
v7:<br><br>1. Message format strings split across lines<br>=C2=A0 =C2=A0Res=
tored to single-line strings in is_select_object_in_temp_write_list()<br>=
=C2=A0 =C2=A0and every other place in the patch (pool_query_context.c and<b=
r>=C2=A0 =C2=A0pool_track_table_mutation.c). Long lines are left long; only=
 the<br>=C2=A0 =C2=A0message strings were rejoined.<br><br>2. The large &qu=
ot;else if&quot; branch in where_to_send_main_replica()<br>=C2=A0 =C2=A0Mov=
ed into a new static subroutine,<br>=C2=A0 =C2=A0where_to_send_dml_adaptive=
_global(), so the routing function stays<br>=C2=A0 =C2=A0readable. The call=
 site is now just:<br><br>=C2=A0 =C2=A0 =C2=A0else if (pool_config-&gt;disa=
ble_load_balance_on_write =3D=3D<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 DLBOW_DML_ADAPTIVE_GLOBAL)<br>=C2=A0 =C2=A0 =C2=A0{<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0where_to_send_dml_adaptive_global(query_context,=
 query, node, dest);<br>=C2=A0 =C2=A0 =C2=A0}<br><br>3. Copyright year on t=
he two new files<br>=C2=A0 =C2=A0Changed to &quot;Copyright (c) 2026&quot; =
in pool_track_table_mutation.c and<br>=C2=A0 =C2=A0pool_track_table_mutatio=
n.h.<br><br>4. FNV-1a comment<br>=C2=A0 =C2=A0Expanded with a short explana=
tion of what FNV-1a is (offset basis +<br>=C2=A0 =C2=A0per-byte XOR/multipl=
y by the FNV prime, non-cryptographic, good<br>=C2=A0 =C2=A0dispersion for =
short keys) and a reference link.<br><br>5. get_current_time() wrapper<br>=
=C2=A0 =C2=A0Good point -- there was no reason for it. Removed the wrapper =
and call<br>=C2=A0 =C2=A0gettimeofday() directly at the call sites.<br><br>=
Attaching the updated single patch:<br><br>=C2=A0 v7-0001-Feature-load-bala=
ncing-control-by-table-tracking.patch<br><br>Builds cleanly and passes the =
dml_adaptive_global routing tests on a<br>PG16 streaming-replication cluste=
r.<br><br>Thanks!</div><br><div class=3D"gmail_quote gmail_quote_container"=
><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Jun 27, 2026 at 4:51=E2=80=
=AFAM Tatsuo Ishii &lt;<a href=3D"mailto:ishii@postgresql.org">ishii@postgr=
esql.org</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">Hi Nadav,<br>
<br>
&gt; Hi Tatsuo,<br>
&gt; <br>
&gt; Sorry -- my wording was misleading. No, unpatched pgpool does NOT have=
<br>
&gt; this problem, and you&#39;re right that your test shows no hang on mas=
ter.<br>
&gt; The hang is entirely in the new code my patch adds, not in pgpool<br>
&gt; itself.<br>
&gt; <br>
&gt; To be precise: the marking code that hung is the dml_adaptive_global<b=
r>
&gt; branch in handle_query_context() (CommandComplete.c) that my patch<br>
&gt; introduces. It is gated on disable_load_balance_on_write =3D<br>
&gt; dml_adaptive_global, which only exists with the patch applied, so mast=
er<br>
&gt; never runs it.<br>
&gt; <br>
&gt; It also doesn&#39;t fire for your exact sequence, for two reasons:<br>
&gt; <br>
&gt;=C2=A0 =C2=A01. You ran it on master, which doesn&#39;t contain the bra=
nch at all.<br>
&gt;=C2=A0 =C2=A02. Even on a patched build, your statements are inside an =
explicit<br>
&gt;=C2=A0 =C2=A0 =C2=A0 transaction (BEGIN ... COMMIT), and that branch on=
ly runs for<br>
&gt;=C2=A0 =C2=A0 =C2=A0 autocommit statements (the &quot;!is_in_transactio=
n&quot; case).<br>
&gt; <br>
&gt; What actually hung, on a patched build with dml_adaptive_global set in=
<br>
&gt; streaming replication, was a *bare autocommit* statement (no surroundi=
ng<br>
&gt; transaction) whose table OID cannot be served from the relcache -- for=
<br>
&gt; example:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0DROP TABLE IF EXISTS non_existent_table;=C2=A0 =C2=A0 =C2=
=A0-- no BEGIN/COMMIT<br>
&gt; <br>
&gt; Because the name is unresolvable, pool_table_name_to_oid() does not ca=
che<br>
&gt; it (no_cache_if_zero), so every lookup is a relcache miss. The marking=
<br>
&gt; branch calls pool_extract_table_oids() -&gt; ... -&gt; do_query() to r=
esolve<br>
&gt; the OID, but handle_query_context() runs before the statement&#39;s<br=
>
&gt; CommandComplete response has been read from the backend, so injecting<=
br>
&gt; that query desyncs the protocol and the session blocks. Backtrace:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0#2=C2=A0 pool_read2=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 (blocked in read())<br>
&gt;=C2=A0 =C2=A0#3=C2=A0 do_query=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=
 =C2=A0 =C2=A0 =C2=A0 &quot;SELECT<br>
&gt; COALESCE(pg_catalog.to_regclass(&#39;...&#39;)::oid, 0)&quot;<br>
&gt;=C2=A0 =C2=A0#4=C2=A0 pool_search_relcache=C2=A0 =C2=A0 =C2=A0 (relcach=
e miss)<br>
&gt;=C2=A0 =C2=A0#5=C2=A0 pool_table_name_to_oid<br>
&gt;=C2=A0 =C2=A0#6=C2=A0 pool_extract_table_oids=C2=A0 =C2=A0query_cache/p=
ool_memqcache.c<br>
&gt;=C2=A0 =C2=A0#7=C2=A0 handle_query_context=C2=A0 =C2=A0 =C2=A0 protocol=
/CommandComplete.c<br>
&gt;=C2=A0 (!is_in_transaction branch)<br>
&gt;=C2=A0 =C2=A0#8=C2=A0 CommandComplete<br>
&gt; <br>
&gt; This is the same class of issue as the one behind your original review=
<br>
&gt; comment: resolving OIDs at CommandComplete time means doing backend I/=
O<br>
&gt; while a response is in flight.<br>
&gt; <br>
&gt; v6-0001 fixes it for good by resolving the written tables&#39; OIDs (a=
nd the<br>
&gt; database OID) at DML *routing* time -- when the connection is idle and=
<br>
&gt; do_query is safe, the same point the feature already resolves OIDs for=
<br>
&gt; the SELECT staleness check. handle_query_context() then only marks the=
<br>
&gt; already-resolved OIDs and does no backend I/O at all, for both the<br>
&gt; autocommit and the COMMIT paths.<br>
&gt; <br>
&gt; Verified on a PG16 streaming-replication cluster with dml_adaptive_glo=
bal:<br>
&gt; the bare &quot;DROP TABLE IF EXISTS non_existent_table;&quot; and your=
<br>
&gt; &quot;BEGIN; DROP TABLE IF EXISTS ...; COMMIT;&quot; both return promp=
tly, the<br>
&gt; deferred-constraint COMMIT failure leaves the table unmarked (reads ke=
ep<br>
&gt; load-balancing to the standby), and a successful autocommit or COMMIT<=
br>
&gt; write marks the table and forces reads to the primary.<br>
<br>
Understood.<br>
<br>
&gt; Sorry again for the confusing earlier phrasing.<br>
<br>
No problem. Thank you for detailed explanation!<br>
<br>
So, my review comments are below. Mostly cosmetic coding style<br>
suggestions.<br>
<br>
diff --git a/src/context/pool_query_context.c b/src/context/pool_query_cont=
ext.c<br>
index 73bc64338..a7756ec8b 100644<br>
--- a/src/context/pool_query_context.c<br>
+++ b/src/context/pool_query_context.c<br>
@@ -1848,20 +1849,26 @@ is_in_list(char *name, List *list)<br>
=C2=A0static bool<br>
=C2=A0is_select_object_in_temp_write_list(Node *node, void *context)<br>
=C2=A0{<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0if (node =3D=3D NULL || pool_config-&gt;disable=
_load_balance_on_write !=3D DLBOW_DML_ADAPTIVE)<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0if (node =3D=3D NULL ||<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0!DLBOW_IS_DML_ADAPT=
IVE(pool_config-&gt;disable_load_balance_on_write))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 return false;<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 if (IsA(node, RangeVar))<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 {<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 RangeVar=C2=A0 =C2=
=A0*rgv =3D (RangeVar *) node;<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0POOL_SESSION_CONTEX=
T *session_context =3D pool_get_session_context(false);<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0POOL_SESSION_CONTEX=
T *session_context;<br>
<br>
-=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (pool_config-&gt=
;disable_load_balance_on_write =3D=3D DLBOW_DML_ADAPTIVE &amp;&amp; session=
_context-&gt;is_in_transaction)<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0session_context =3D=
 pool_get_session_context(false);<br>
+<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0if (session_context=
-&gt;is_in_transaction)<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 {<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 ereport(DEBUG1,<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(errmsg(&=
quot;is_select_object_in_temp_write_list: \&quot;%s\&quot;, found relation =
\&quot;%s\&quot;&quot;, (char *) context, rgv-&gt;relname)));<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(errmsg(&=
quot;is_select_object_in_temp_write_list:&quot;<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&quot; \&quot;%s\&quot;, fo=
und relation \&quot;%s\&quot;&quot;,<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(char *) context, rgv-&gt;r=
elname)));<br>
<br>
I guess you aimed to shorten the message so that it does not exceed<br>
line length limit (78). But IMO the rule is not applied to message<br>
format strings because this kind of style (divide the message line<br>
into multiple lines) is hard to read. I suggest to restore to former style.=
<br>
<br>
Same suggestion is applied to all other similar places.<br>
<br>
@@ -2169,6 +2275,153 @@ where_to_send_main_replica(POOL_QUERY_CONTEXT *quer=
y_context, char *query, Node<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 {<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 pool_set=
_node_to_be_sent(query_context, PRIMARY_NODE_ID);<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 }<br>
+<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0/*<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 * Check track table mutation for rec=
ently written tables.=C2=A0 If<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 * in cold start or any table was rec=
ently written, route to<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 * primary to avoid stale reads.<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 */<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0else if (pool_config-&gt;disable_load=
_balance_on_write =3D=3D<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 DLBOW_DML_ADAPTIVE_GLOBAL)<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 =C2=A0 =C2=A0 =C2=A0 =C2=A0{<br>
<br>
This &quot;else if&quot; branch is too large and hard to read. You should m=
ove<br>
the code of the branch to a subroutine and call it from here.<br>
<br>
diff --git a/src/include/utils/pool_track_table_mutation.h b/src/include/ut=
ils/pool_track_table_mutation.h<br>
new file mode 100644<br>
index 000000000..dfbac666d<br>
--- /dev/null<br>
+++ b/src/include/utils/pool_track_table_mutation.h<br>
@@ -0,0 +1,167 @@<br>
+/* -*-pgsql-c-*- */<br>
+/*<br>
+ * pgpool: a language independent connection pool server for PostgreSQL<br=
>
+ * written by Tatsuo Ishii<br>
+ *<br>
+ * Copyright (c) 2003-2026=C2=A0 =C2=A0 =C2=A0PgPool Global Development Gr=
oup<br>
<br>
Since this file is new, the Copyright year should be just 2026.<br>
+ * Copyright (c) 2026=C2=A0 PgPool Global Development Group<br>
<br>
diff --git a/src/protocol/CommandComplete.c b/src/protocol/CommandComplete.=
c<br>
index 1f63a0e8d..76e77fea0 100644<br>
--- a/src/protocol/CommandComplete.c<br>
+++ b/src/protocol/CommandComplete.c<br>
diff --git a/src/utils/pool_track_table_mutation.c b/src/utils/pool_track_t=
able_mutation.c<br>
new file mode 100644<br>
index 000000000..e7771e7bf<br>
--- /dev/null<br>
+++ b/src/utils/pool_track_table_mutation.c<br>
@@ -0,0 +1,902 @@<br>
+/* -*-pgsql-c-*- */<br>
+/*<br>
+ * pgpool: a language independent connection pool server for PostgreSQL<br=
>
+ * written by Tatsuo Ishii<br>
+ *<br>
+ * Copyright (c) 2003-2026=C2=A0 =C2=A0 =C2=A0PgPool Global Development Gr=
oup<br>
<br>
Since this file is new, the Copyright year should be just 2026.<br>
+ * Copyright (c) 2026=C2=A0 PgPool Global Development Group<br>
<br>
+/* ----------------<br>
+ * Hash functions<br>
+ * ----------------<br>
+ */<br>
+<br>
+/*<br>
+ * FNV-1a hash for table/database oid pair<br>
+ */<br>
<br>
Can you please add more comments regarding FNV-1a? I&#39;m not sure<br>
everyone is famimilar with FNV-1a (at lease I am not).<br>
<br>
+/*<br>
+ * Get current time<br>
+ */<br>
+static void<br>
+get_current_time(struct timeval *tv)<br>
+{<br>
+=C2=A0 =C2=A0 =C2=A0 =C2=A0gettimeofday(tv, NULL);<br>
+}<br>
<br>
Just out of curiosity, why you don&#39;t call gettimeofday directly?<br>
<br>
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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