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Date: Mon, 21 Feb 2022 09:09:12 -0300
From: "Euler Taveira" <euler@eulerto.com>
To: pgsql-hackers@lists.postgresql.org
Subject: speed up a logical replica setup
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Hi,

Logical replication has been used to migration with minimal downtime. However,
if you are dealing with a big database, the amount of required resources (disk
-- due to WAL retention) increases as the backlog (WAL) increases. Unless you
have a generous amount of resources and can wait for long period of time until
the new replica catches up, creating a logical replica is impracticable on
large databases.

The general idea is to create and convert a physical replica or a base backup
(archived WAL files available) into a logical replica. The initial data copy
and catchup tends to be faster on a physical replica. This technique has been
successfully used in pglogical_create_subscriber [1].

A new tool called pg_subscriber does this conversion and is tightly integrated
with Postgres.

DESIGN

The conversion requires 8 steps.

1. Check if the target data directory has the same system identifier than the
source data directory.
2. Stop the target server if it is running as a standby server. (Modify
recovery parameters requires a restart.)
3. Create one replication slot per specified database on the source server. One
additional replication slot is created at the end to get the consistent LSN
(This consistent LSN will be used as (a) a stopping point for the recovery
process and (b) a starting point for the subscriptions).
4. Write recovery parameters into the target data directory and start the
target server (Wait until the target server is promoted).
5. Create one publication (FOR ALL TABLES) per specified database on the source
server.
6. Create one subscription per specified database on the target server (Use
replication slot and publication created in a previous step. Don't enable the
subscriptions yet).
7. Sets the replication progress to the consistent LSN that was got in a
previous step.
8. Enable the subscription for each specified database on the target server.

This tool does not take a base backup. It can certainly be included later.
There is already a tool do it: pg_basebackup.

There is a --subscriber-conninfo option to inform the subscriber connection
string, however, we could remove it since this tool runs on the subscriber and
we can build a connection string.

NAME

I'm not sure about the proposed name. I came up with this one because it is not
so long. The last added tools uses pg_ prefix, verb (action) and object.
pg_initsubscriber and pg_createsubscriber are names that I thought but I'm not
excited about it.

DOCUMENTATION

It is available and describes this tool.

TESTS

Basic tests are included. It requires some tests to exercise this tool.


Comments?

[1] https://github.com/2ndQuadrant/pglogical


--
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>Hi,<br></div><d=
iv><br></div><div>Logical replication has been used to migration with mi=
nimal downtime. However,<br></div><div>if you are dealing with a big dat=
abase, the amount of required resources (disk<br></div><div>-- due to WA=
L retention) increases as the backlog (WAL) increases. Unless you<br></d=
iv><div>have a generous amount of resources and can wait for long period=
 of time until<br></div><div>the new replica catches up, creating a logi=
cal replica is impracticable on<br></div><div>large databases.<br></div>=
<div><br></div><div>The general idea is to create and convert a physical=
 replica or a base backup<br></div><div>(archived WAL files available) i=
nto a logical replica. The initial data copy<br></div><div>and catchup t=
ends to be faster on a physical replica. This technique has been<br></di=
v><div>successfully used in pglogical_create_subscriber [1].<br></div><d=
iv><br></div><div>A new tool called pg_subscriber does this conversion a=
nd is tightly integrated<br></div><div>with Postgres.<br></div><div><br>=
</div><div>DESIGN<br></div><div><br></div><div>The conversion requires 8=
 steps.<br></div><div><br></div><div>1. Check if the target data directo=
ry has the same system identifier than the<br></div><div>source data dir=
ectory.<br></div><div>2. Stop the target server if it is running as a st=
andby server. (Modify<br></div><div>recovery parameters requires a resta=
rt.)<br></div><div>3. Create one replication slot per specified database=
 on the source server. One<br></div><div>additional replication slot is =
created at the end to get the consistent LSN<br></div><div>(This consist=
ent LSN will be used as (a) a stopping point for the recovery<br></div><=
div>process and (b) a starting point for the subscriptions).<br></div><d=
iv>4. Write recovery parameters into the target data directory and start=
 the<br></div><div>target server (Wait until the target server is promot=
ed).<br></div><div>5. Create one publication (FOR ALL TABLES) per specif=
ied database on the source<br></div><div>server.<br></div><div>6. Create=
 one subscription per specified database on the target server (Use<br></=
div><div>replication slot and publication created in a previous step. Do=
n't enable the<br></div><div>subscriptions yet).<br></div><div>7. Sets t=
he replication progress to the consistent LSN that was got in a<br></div=
><div>previous step.<br></div><div>8. Enable the subscription for each s=
pecified database on the target server.<br></div><div><br></div><div>Thi=
s tool does not take a base backup. It can certainly be included later.<=
br></div><div>There is already a tool do it: pg_basebackup.<br></div><di=
v><br></div><div>There is a --subscriber-conninfo option to inform the s=
ubscriber connection<br></div><div>string, however, we could remove it s=
ince this tool runs on the subscriber and<br></div><div>we can build a c=
onnection string.<br></div><div><br></div><div>NAME<br></div><div><br></=
div><div>I'm not sure about the proposed name. I came up with this one b=
ecause it is not<br></div><div>so long. The last added tools uses pg_ pr=
efix, verb (action) and object.<br></div><div>pg_initsubscriber and pg_c=
reatesubscriber are names that I thought but I'm not<br></div><div>excit=
ed about it.<br></div><div><br></div><div>DOCUMENTATION<br></div><div><b=
r></div><div>It is available and describes this tool.<br></div><div><br>=
</div><div>TESTS<br></div><div><br></div><div>Basic tests are included. =
It requires some tests to exercise this tool.<br></div><div><br></div><d=
iv><br></div><div>Comments?<br></div><div><br></div><div>[1] <a href=3D"=
https://github.com/2ndQuadrant/pglogical">https://github.com/2ndQuadrant=
/pglogical</a><br></div><div><br></div><div><br></div><div id=3D"sig1124=
09080"><div class=3D"signature">--<br></div><div class=3D"signature">Eul=
er Taveira<br></div><div class=3D"signature">EDB&nbsp;&nbsp; <a href=3D"=
https://www.enterprisedb.com/">https://www.enterprisedb.com/</a><br></di=
v></div><div><br></div></body></html>
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