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List: postgresql-general
Subject: Logical Replication - One table 8 minutes, Identical Two Tables 28 Minutes (Expected 16 Minutes)
From: Avi Weinberg <AviW () gilat ! com>
Date: 2021-12-27 13:35:58
Message-ID: DB9PR07MB7180E7A4CD39D54A7DE78673CB429 () DB9PR07MB7180 ! eurprd07 ! prod ! outlook ! com
[Download RAW message or body]
Hi All,
When I have only one table (2.5GB) in logical replication publication it takes 8 \
minutes to sync to the subscriber when I created a copy of the table and added it to \
the publication it took 28 minutes. When I sync three IDENTICAL tables of the same \
size it take 46 minutes! I expected the tables to be synched in parallel or at least \
one after the other, but it turned out the time increase is much larger than just to \
sync additional table of the same size. Two tables should be 8*2=16 minutes and not \
28 and three tables should be 8*3=24 minutes and not 46.
The table has one pk int column and one binary column file_content of type bytea.
What might be the reason for this behavior? Can I improve the time it takes to sync \
several tables so it will be no more than the (time to sync one table) * (number of \
tables)
Doing it for two tables took 28 minutes
2021-12-27 10:32:13.740 UTC [4430] LOG: logical replication apply worker for \
subscription "sub_gwn1" has started 2021-12-27 10:32:13.815 UTC [4431] LOG: logical \
replication table synchronization worker for subscription "sub_gwn1", table "p1" has \
started 2021-12-27 10:32:13.827 UTC [4432] LOG: logical replication table \
synchronization worker for subscription "sub_gwn1", table "p" has started 2021-12-27 \
10:57:57.542 UTC [4432] LOG: logical replication table synchronization worker for \
subscription "sub_gwn1", table "p" has finished 2021-12-27 11:00:03.806 UTC [4431] \
LOG: logical replication table synchronization worker for subscription "sub_gwn1", \
table "p1" has finished
Doing it for three tables took 46 minutes
2021-12-27 11:49:11.931 UTC [4739] LOG: logical replication table synchronization \
worker for subscription "sub_gwn1", table "p2" has started 2021-12-27 11:49:11.948 \
UTC [4740] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p1" has started 2021-12-27 12:23:44.673 UTC [4740] LOG: logical \
replication table synchronization worker for subscription "sub_gwn1", table "p1" has \
finished 2021-12-27 12:23:44.783 UTC [4845] LOG: logical replication table \
synchronization worker for subscription "sub_gwn1", table "p" has started 2021-12-27 \
12:28:53.320 UTC [4739] LOG: logical replication table synchronization worker for \
subscription "sub_gwn1", table "p2" has finished 2021-12-27 12:35:49.156 UTC [4845] \
LOG: logical replication table synchronization worker for subscription "sub_gwn1", \
table "p" has finished
Thanks!
IMPORTANT - This email and any attachments is intended for the above named \
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<p class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Hi \
All,<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">When I \
have only one table (2.5GB) in logical replication publication it takes 8 minutes to \
sync to the subscriber when I created a copy of the table and added it to the \
publication it took 28 minutes. When I sync three IDENTICAL tables of the same \
size it take 46 minutes!<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">I expected the tables to be \
synched in parallel or at least one after the other, but it turned out the time \
increase is much larger than just to sync additional table of the same size. \
Two tables should be 8*2=16 minutes and not 28 and three tables should be 8*3=24 \
minutes and not 46.<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">The table \
has one pk int column and one binary column file_content of type \
bytea.<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">What might \
be the reason for this behavior? Can I improve the time it takes to sync several \
tables so it will be no more than the (time to sync one table) * (number of \
tables)<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Doing it \
for two tables took 28 minutes<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 10:32:13.740 UTC \
[4430] LOG: logical replication apply worker for subscription \
"sub_gwn1" has started<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 10:32:13.815 UTC \
[4431] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p1" has started<o:p></o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 \
10:32:13.827 UTC [4432] LOG: logical replication table synchronization worker \
for subscription "sub_gwn1", table "p" has started<o:p></o:p></p> \
<p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 10:57:57.542 UTC \
[4432] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p" has finished<o:p></o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 \
11:00:03.806 UTC [4431] LOG: logical replication table synchronization worker \
for subscription "sub_gwn1", table "p1" has \
finished<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Doing it \
for three tables took 46 minutes<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 11:49:11.931 UTC \
[4739] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p2" has started<o:p></o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 \
11:49:11.948 UTC [4740] LOG: logical replication table synchronization worker \
for subscription "sub_gwn1", table "p1" has \
started<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 12:23:44.673 UTC \
[4740] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p1" has finished<o:p></o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 \
12:23:44.783 UTC [4845] LOG: logical replication table synchronization worker \
for subscription "sub_gwn1", table "p" has started<o:p></o:p></p> \
<p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 12:28:53.320 UTC \
[4739] LOG: logical replication table synchronization worker for subscription \
"sub_gwn1", table "p2" has finished<o:p></o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">2021-12-27 \
12:35:49.156 UTC [4845] LOG: logical replication table synchronization worker \
for subscription "sub_gwn1", table "p" has \
finished<o:p></o:p></p> <p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> <p \
class="MsoNormal" style="text-align:left;direction:ltr;unicode-bidi:embed">Thanks!<o:p></o:p></p>
<p class="MsoNormal" \
style="text-align:left;direction:ltr;unicode-bidi:embed"><o:p> </o:p></p> </div>
IMPORTANT - This email and any attachments is intended for the above named \
addressee(s), and may contain information which is confidential or privileged. If you \
are not the intended recipient, please inform the sender immediately and delete this \
email: you should not copy or use this e-mail for any purpose nor disclose its \
contents to any person. </body>
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