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Date: Wed, 07 Feb 2024 01:53:37 -0300
From: "Euler Taveira" <euler@eulerto.com>
To: "kuroda.hayato@fujitsu.com" <kuroda.hayato@fujitsu.com>,
 =?UTF-8?Q?Fabr=C3=ADzio_de_Royes_Mello?= <fabriziomello@gmail.com>
Cc: 
 "pgsql-hackers@lists.postgresql.org" <pgsql-hackers@lists.postgresql.org>,
 "vignesh C" <vignesh21@gmail.com>, "Michael Paquier" <michael@paquier.xyz>,
 "Peter Eisentraut" <peter@eisentraut.org>,
 "Andres Freund" <andres@anarazel.de>,
 "Ashutosh Bapat" <ashutosh.bapat.oss@gmail.com>,
 "Amit Kapila" <amit.kapila16@gmail.com>,
 "Shlok Kyal" <shlok.kyal.oss@gmail.com>
Subject: Re: speed up a logical replica setup
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On Fri, Feb 2, 2024, at 6:41 AM, Hayato Kuroda (Fujitsu) wrote:
> Thanks for updating the patch!

Thanks for taking a look.

> >
> I'm still working on the data structures to group options. I don't like the way
> it was grouped in v13-0005. There is too many levels to reach database name.
> The setup_subscriber() function requires the 3 data structures.
> >
> 
> Right, your refactoring looks fewer stack. So I pause to revise my refactoring
> patch.

I didn't complete this task yet so I didn't include it in this patch.

> >
> The documentation update is almost there. I will include the modifications in
> the next patch.
> >
> 
> OK. I think it should be modified before native speakers will attend to the
> thread.

Same for this one.

> >
> Regarding v13-0004, it seems a good UI that's why I wrote a comment about it.
> However, it comes with a restriction that requires a similar HBA rule for both
> regular and replication connections. Is it an acceptable restriction? We might
> paint ourselves into the corner. A reasonable proposal is not to remove this
> option. Instead, it should be optional. If it is not provided, primary_conninfo
> is used.
> >
> 
> I didn't have such a point of view. However, it is not related whether -P exists
> or not. Even v14-0001 requires primary to accept both normal/replication connections.
> If we want to avoid it, the connection from pg_createsubscriber can be restored
> to replication-connection.
> (I felt we do not have to use replication protocol even if we change the connection mode)

That's correct. We made a decision to use non physical replication connections
(besides the one used to connect primary <-> standby). Hence, my concern about
a HBA rule falls apart. I'm not convinced that using a modified
primary_conninfo is the only/right answer to fill the subscription connection
string. Physical vs logical replication has different requirements when we talk
about users. The physical replication requires only the REPLICATION privilege.
On the other hand, to create a subscription you must have the privileges of
pg_create_subscription role and also CREATE privilege on the specified
database. Unless, you are always recommending the superuser for this tool, I'm
afraid there will be cases that reusing primary_conninfo will be an issue. The
more I think about this UI, the more I think that, if it is not hundreds of
lines of code, it uses the primary_conninfo the -P is not specified.

> The motivation why -P is not needed is to ensure the consistency of nodes.
> pg_createsubscriber assumes that the -P option can connect to the upstream node,
> but no one checks it. Parsing two connection strings may be a solution but be
> confusing. E.g., what if some options are different?
> I think using a same parameter is a simplest solution.

Ugh. An error will occur the first time (get_primary_sysid) it tries to connect
to primary.

> I found that no one refers the name of temporary slot. Can we remove the variable?

It is gone. I did a refactor in the create_logical_replication_slot function.
Slot name is assigned internally (no need for slot_name or temp_replslot) and
temporary parameter is included.

> Initialization by `CreateSubscriberOptions opt = {0};` seems enough.
> All values are set to 0x0.

It is. However, I keep the assignments for 2 reasons: (a) there might be
parameters whose default value is not zero, (b) the standard does not say that
a null pointer must be represented by zero and (c) there is no harm in being
paranoid during initial assignment.

> You said "target server must be a standby" in [1], but I cannot find checks for it.
> IIUC, there are two approaches:
> a) check the existence "standby.signal" in the data directory
> b) call an SQL function "pg_is_in_recovery"

I applied v16-0004 that implements option (b).

> I still think they can be combined as "bindir".

I applied a patch that has a single variable for BINDIR.

> WriteRecoveryConfig() writes GUC parameters to postgresql.auto.conf, but not
> sure it is good. These settings would remain on new subscriber even after the
> pg_createsubscriber. Can we avoid it? I come up with passing these parameters
> via pg_ctl -o option, but it requires parsing output from GenerateRecoveryConfig()
> (all GUCs must be allign like "-c XXX -c XXX -c XXX...").

I applied a modified version of v16-0006.

> Functions arguments should not be struct because they are passing by value.
> They should be a pointer. Or, for modify_subscriber_sysid and wait_for_end_recovery,
> we can pass a value which would be really used.

Done.

> 07.
> ```
> static char *get_base_conninfo(char *conninfo, char *dbname,
>    const char *noderole);
> ```
> 
> Not sure noderole should be passed here. It is used only for the logging.
> Can we output string before calling the function?
> (The parameter is not needed anymore if -P is removed)

Done.

> 08.
> The terminology is still not consistent. Some functions call the target as standby,
> but others call it as subscriber.

The terminology should reflect the actual server role. I'm calling it "standby"
if it is a physical replica and "subscriber" if it is a logical replica. Maybe
"standby" isn't clear enough.

> 09.
> v14 does not work if the standby server has already been set recovery_target*
> options. PSA the reproducer. I considered two approaches:
> 
> a) raise an ERROR when these parameter were set. check_subscriber() can do it
> b) overwrite these GUCs as empty strings. 

I prefer (b) that's exactly what you provided in v16-0006. 

> 10.
> The execution always fails if users execute --dry-run just before. Because
> pg_createsubscriber stops the standby anyway. Doing dry run first is quite normal
> use-case, so current implementation seems not user-friendly. How should we fix?
> Below bullets are my idea:
> 
> a) avoid stopping the standby in case of dry_run: seems possible.
> b) accept even if the standby is stopped: seems possible.
> c) start the standby at the end of run: how arguments like pg_ctl -l should be specified?

I prefer (a). I applied a slightly modified version of v16-0005.

This new patch contains the following changes:

* check whether the target is really a standby server (0004)
* refactor: pg_create_logical_replication_slot function
* use a single variable for pg_ctl and pg_resetwal directory
* avoid recovery errors applying default settings for some GUCs (0006)
* don't stop/start the standby in dry run mode (0005)
* miscellaneous fixes

I don't understand why v16-0002 is required. In a previous version, this patch
was using connections in logical replication mode. After some discussion we
decided to change it to regular connections and use SQL functions (instead of
replication commands). Is it a requirement for v16-0003?

I started reviewing v16-0007 but didn't finish yet. The general idea is ok.
However, I'm still worried about preventing some use cases if it provides only
the local connection option. What if you want to keep monitoring this instance
while the transformation is happening? Let's say it has a backlog that will
take some time to apply. Unless, you have a local agent, you have no data about
this server until pg_createsubscriber terminates. Even the local agent might
not connect to the server unless you use the current port.


--
Euler Taveira
EDB   https://www.enterprisedb.com/

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<!DOCTYPE html><html><head><title></title><style type=3D"text/css">p.Mso=
Normal,p.MsoNoSpacing{margin:0}</style></head><body><div>On Fri, Feb 2, =
2024, at 6:41 AM, Hayato Kuroda (Fujitsu) wrote:<br></div><blockquote ty=
pe=3D"cite" id=3D"qt" style=3D""><div>Thanks for updating the patch!<br>=
</div></blockquote><div><br></div><div>Thanks for taking a look.<br></di=
v><div><br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><div>&gt=
;<br></div><div>I'm still working on the data structures to group option=
s. I don't like the way<br></div><div>it was grouped in v13-0005. There =
is too many levels to reach database name.<br></div><div>The setup_subsc=
riber() function requires the 3 data structures.<br></div><div>&gt;<br><=
/div><div><br></div><div>Right, your refactoring looks fewer stack. So I=
 pause to revise my refactoring<br></div><div>patch.<br></div></blockquo=
te><div><br></div><div>I didn't complete this task yet so I didn't inclu=
de it in this patch.<br></div><div><br></div><blockquote type=3D"cite" i=
d=3D"qt" style=3D""><div>&gt;<br></div><div>The documentation update is =
almost there. I will include the modifications in<br></div><div>the next=
 patch.<br></div><div>&gt;<br></div><div><br></div><div>OK. I think it s=
hould be modified before native speakers will attend to the<br></div><di=
v>thread.<br></div></blockquote><div><br></div><div>Same for this one.<b=
r></div><div><br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><d=
iv>&gt;<br></div><div>Regarding v13-0004, it seems a good UI that's why =
I wrote a comment about it.<br></div><div>However, it comes with a restr=
iction that requires a similar HBA rule for both<br></div><div>regular a=
nd replication connections. Is it an acceptable restriction? We might<br=
></div><div>paint ourselves into the corner. A reasonable proposal is no=
t to remove this<br></div><div>option. Instead, it should be optional. I=
f it is not provided, primary_conninfo<br></div><div>is used.<br></div><=
div>&gt;<br></div><div><br></div><div>I didn't have such a point of view=
. However, it is not related whether -P exists<br></div><div>or not. Eve=
n v14-0001 requires primary to accept both normal/replication connection=
s.<br></div><div>If we want to avoid it, the connection from pg_createsu=
bscriber can be restored<br></div><div>to replication-connection.<br></d=
iv><div>(I felt we do not have to use replication protocol even if we ch=
ange the connection mode)<br></div></blockquote><div><br></div><div>That=
's correct. We made a decision to use non physical replication connectio=
ns<br></div><div>(besides the one used to connect primary &lt;-&gt; stan=
dby). Hence, my concern about<br></div><div>a HBA rule falls apart. I'm =
not convinced that using a modified<br></div><div>primary_conninfo is th=
e only/right answer to fill the subscription connection<br></div><div>st=
ring. Physical vs logical replication has different requirements when we=
 talk<br></div><div>about users. The physical replication requires only =
the REPLICATION privilege.<br></div><div>On the other hand, to create a =
subscription you must have the privileges of<br></div><div>pg_create_sub=
scription role and also CREATE privilege on the specified<br></div><div>=
database. Unless, you are always recommending the superuser for this too=
l, I'm<br></div><div>afraid there will be cases that reusing primary_con=
ninfo will be an issue. The<br></div><div>more I think about this UI, th=
e more I think that, if it is not hundreds of<br></div><div>lines of cod=
e, it uses the primary_conninfo the -P is not specified.<br></div><div><=
br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><div>The motivat=
ion why -P is not needed is to ensure the consistency of nodes.<br></div=
><div>pg_createsubscriber assumes that the -P option can connect to the =
upstream node,<br></div><div>but no one checks it. Parsing two connectio=
n strings may be a solution but be<br></div><div>confusing. E.g., what i=
f some options are different?<br></div><div>I think using a same paramet=
er is a simplest solution.<br></div></blockquote><div><br></div><div>Ugh=
. An error will occur the first time (get_primary_sysid) it tries to con=
nect<br></div><div>to primary.<br></div><div><br></div><blockquote type=3D=
"cite" id=3D"qt" style=3D""><div>I found that no one refers the name of =
temporary slot. Can we remove the variable?<br></div></blockquote><div><=
br></div><div>It is gone. I did a refactor in the create_logical_replica=
tion_slot function.<br></div><div>Slot name is assigned internally (no n=
eed for slot_name or temp_replslot) and<br></div><div>temporary paramete=
r is included.<br></div><div><br></div><blockquote type=3D"cite" id=3D"q=
t" style=3D""><div>Initialization by `CreateSubscriberOptions opt =3D {0=
};` seems enough.<br></div><div>All values are set to 0x0.<br></div></bl=
ockquote><div><br></div><div>It is. However, I keep the assignments for =
2 reasons: (a) there might be<br></div><div>parameters whose default val=
ue is not zero, (b) the standard does not say that<br></div><div>a null =
pointer must be represented by zero and (c) there is no harm in being<br=
></div><div>paranoid during initial assignment.<br></div><div><br></div>=
<blockquote type=3D"cite" id=3D"qt" style=3D""><div>You said "target ser=
ver must be a standby" in [1], but I cannot find checks for it.<br></div=
><div>IIUC, there are two approaches:<br></div><div>a) check the existen=
ce "standby.signal" in the data directory<br></div><div>b) call an SQL f=
unction "pg_is_in_recovery"<br></div></blockquote><div><br></div><div>I =
applied v16-0004 that implements option (b).<br></div><div><br></div><bl=
ockquote type=3D"cite" id=3D"qt" style=3D""><div>I still think they can =
be combined as "bindir".<br></div></blockquote><div><br></div><div>I app=
lied a patch that has a single variable for BINDIR.<br></div><div><br></=
div><blockquote type=3D"cite" id=3D"qt" style=3D""><div>WriteRecoveryCon=
fig() writes GUC parameters to postgresql.auto.conf, but not<br></div><d=
iv>sure it is good. These settings would remain on new subscriber even a=
fter the<br></div><div>pg_createsubscriber. Can we avoid it? I come up w=
ith passing these parameters<br></div><div>via pg_ctl -o option, but it =
requires parsing output from GenerateRecoveryConfig()<br></div><div>(all=
 GUCs must be allign like "-c XXX -c XXX -c XXX...").<br></div></blockqu=
ote><div><br></div><div>I applied a modified version of v16-0006.<br></d=
iv><div><br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><div>Fu=
nctions arguments should not be struct because they are passing by value=
.<br></div><div>They should be a pointer. Or, for modify_subscriber_sysi=
d and wait_for_end_recovery,<br></div><div>we can pass a value which wou=
ld be really used.<br></div></blockquote><div><br></div><div>Done.<br></=
div><div><br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><div>0=
7.<br></div><div>```<br></div><div>static char *get_base_conninfo(char *=
conninfo, char *dbname,<br></div><div>&nbsp;&nbsp; const char *noderole)=
;<br></div><div>```<br></div><div><br></div><div>Not sure noderole shoul=
d be passed here. It is used only for the logging.<br></div><div>Can we =
output string before calling the function?<br></div><div>(The parameter =
is not needed anymore if -P is removed)<br></div></blockquote><div><br><=
/div><div>Done.<br></div><div><br></div><blockquote type=3D"cite" id=3D"=
qt" style=3D""><div>08.<br></div><div>The terminology is still not consi=
stent. Some functions call the target as standby,<br></div><div>but othe=
rs call it as subscriber.<br></div></blockquote><div><br></div><div>The =
terminology should reflect the actual server role. I'm calling it "stand=
by"<br></div><div>if it is a physical replica and "subscriber" if it is =
a logical replica. Maybe<br></div><div>"standby" isn't clear enough.<br>=
</div><div><br></div><blockquote type=3D"cite" id=3D"qt" style=3D""><div=
>09.<br></div><div>v14 does not work if the standby server has already b=
een set recovery_target*<br></div><div>options. PSA the reproducer. I co=
nsidered two approaches:<br></div><div><br></div><div>a) raise an ERROR =
when these parameter were set. check_subscriber() can do it<br></div><di=
v>b) overwrite these GUCs as empty strings.&nbsp;<br></div></blockquote>=
<div><br></div><div>I prefer (b) that's exactly what you provided in v16=
-0006.&nbsp;<br></div><div><br></div><blockquote type=3D"cite" id=3D"qt"=
 style=3D""><div>10.<br></div><div>The execution always fails if users e=
xecute --dry-run just before. Because<br></div><div>pg_createsubscriber =
stops the standby anyway. Doing dry run first is quite normal<br></div><=
div>use-case, so current implementation seems not user-friendly. How sho=
uld we fix?<br></div><div>Below bullets are my idea:<br></div><div><br><=
/div><div>a) avoid stopping the standby in case of dry_run: seems possib=
le.<br></div><div>b) accept even if the standby is stopped: seems possib=
le.<br></div><div>c) start the standby at the end of run: how arguments =
like pg_ctl -l should be specified?<br></div></blockquote><div><br></div=
><div>I prefer (a). I applied a slightly modified version of v16-0005.<b=
r></div><div><br></div><div>This new patch contains the following change=
s:<br></div><div><br></div><div>* check whether the target is really a s=
tandby server (0004)<br></div><div>* refactor: pg_create_logical_replica=
tion_slot function<br></div><div>* use a single variable for pg_ctl and =
pg_resetwal directory<br></div><div>* avoid recovery errors applying def=
ault settings for some GUCs (0006)<br></div><div>* don't stop/start the =
standby in dry run mode (0005)<br></div><div>* miscellaneous fixes<br></=
div><div><br></div><div>I don't understand why v16-0002 is required. In =
a previous version, this patch<br></div><div>was using connections in lo=
gical replication mode. After some discussion we<br></div><div>decided t=
o change it to regular connections and use SQL functions (instead of<br>=
</div><div>replication commands). Is it a requirement for v16-0003?<br><=
/div><div><br></div><div>I started reviewing v16-0007 but didn't finish =
yet. The general idea is ok.<br></div><div>However, I'm still worried ab=
out preventing some use cases if it provides only<br></div><div>the loca=
l connection option. What if you want to keep monitoring this instance<b=
r></div><div>while the transformation is happening? Let's say it has a b=
acklog that will<br></div><div>take some time to apply. Unless, you have=
 a local agent, you have no data about<br></div><div>this server until p=
g_createsubscriber terminates. Even the local agent might<br></div><div>=
not connect to the server unless you use the current port.<br></div><div=
><br></div><div><br></div><div id=3D"sig112409080"><div class=3D"signatu=
re">--<br></div><div class=3D"signature">Euler Taveira<br></div><div cla=
ss=3D"signature">EDB&nbsp;&nbsp; <a href=3D"https://www.enterprisedb.com=
/">https://www.enterprisedb.com/</a><br></div></div><div><br></div></bod=
y></html>
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