| From: | Abhishek Bhola <abhishek(dot)bhola(at)japannext(dot)co(dot)jp> |
|---|---|
| To: | Vijaykumar Jain <vijaykumarjain(dot)github(at)gmail(dot)com> |
| Cc: | Steve Baldwin <steve(dot)baldwin(at)gmail(dot)com>, pgsql-general <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Subscription stuck at initialize state |
| Date: | 2022-02-03 09:43:47 |
| Message-ID: | CAEDsCzio4dcR7ZZYrepzfsX8n-TtsCo60DwmNr9wkSKM+Ye5gw@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
* *Basic Connectivity from target(subscriber) to source (Publisher)-*
postgres(at)targethost:~$ psql -h sourcedb-vip --port=5432 --user=dba -d
sourcedb
Password for user dba:
psql (13.3)
Type "help" for help.
sourcedb=#
* *Create Publication*
sourcedb=# CREATE PUBLICATION omx_archive FOR TABLE
sample_table1, sample_table2, sample_table3
;
* *Create subscription* - *Please see the table sample_tables exists on
both and have the same structure*
targetdb=# CREATE SUBSCRIPTION sub_omx_archive_tci
CONNECTION 'host=sourcedb-vip port=5432 user=dba dbname=sourcedb
password=xxxxx'
PUBLICATION omx_archive with (enabled =true, create_slot = true, copy_data
= true);
* *Target DB replication origin status having 0/0 remote_lsb*
targetdb=# select * from pg_replication_origin_status;
local_id | external_id | remote_lsn | local_lsn
----------+---------------+----------------+----------------
1 | *pg_3615756798 *| 9E98/9F62A7A8 | 15197/E0CA940
2 | *pg_3616584803 *| 0/0 | 0/0
(2 rows)
*postgres(at)targethost:~$ ps -ef | grep subscription*
postgres 30997 238163 0 18:07 pts/0 00:00:00 grep --color=auto
subscription
postgres 168277 124365 1 13:46 ? 00:04:23 postgres: logical
replication worker for subscription *3616584803*
postgres 178901 124365 0 05:08 ? 00:00:08 postgres: logical
replication worker for subscription *3615756798*
* *Strace for the subscription 3616584803 (PID 168277) - the one with the
problem. The other one is okay and hence not shown*
postgres(at)targethost:~$ *strace -p 168277 *
strace: Process 168277 attached
epoll_wait(21, [], 1, 831) = 0
close(21) = 0
sendto(8,
"d\0\0\0&r\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\2"...,
39, MSG_NOSIGNAL, NULL, 0) = 39
recvfrom(8, 0x21f60f0, 16384, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 21
epoll_ctl(21, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804168,
u64=34804168}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804192,
u64=34804192}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 8, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804216,
u64=34804216}}) = 0
epoll_wait(21, [], 1, 1000) = 0
close(21) = 0
recvfrom(8, 0x21f60f0, 16384, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 21
epoll_ctl(21, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804168,
u64=34804168}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804192,
u64=34804192}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 8, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804216,
u64=34804216}}) = 0
epoll_wait(21, [], 1, 1000) = 0
close(21) = 0
sendto(8,
"d\0\0\0&r\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\2"...,
39, MSG_NOSIGNAL, NULL, 0) = 39
recvfrom(8, 0x21f60f0, 16384, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 21
epoll_ctl(21, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804168,
u64=34804168}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804192,
u64=34804192}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 8, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804216,
u64=34804216}}) = 0
epoll_wait(21, [], 1, 1000) = 0
close(21) = 0
recvfrom(8, 0x21f60f0, 16384, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 21
epoll_ctl(21, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804168,
u64=34804168}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804192,
u64=34804192}}) = 0
epoll_ctl(21, EPOLL_CTL_ADD, 8, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=34804216,
u64=34804216}}) = 0
epoll_wait(21, [], 1, 1000) = 0
close(21) = 0
sendto(8,
"d\0\0\0&r\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\0\236\230\343\275V\370\0\2"...,
39, MSG_NOSIGNAL, NULL, 0) = 39
recvfrom(8, 0x21f60f0, 16384, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.440"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.440"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.440"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.440"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.441"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.441"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.441"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.441"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.442"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.442"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.442"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
write(2, "\0\0\371\0U\221\2\0T2022-02-03 18:08:21.442"..., 258) = 258
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 167, MSG_NOSIGNAL, NULL,
0) = 167
sendto(9, "<133>Feb 3 18:08:21 postgres[16"..., 184, MSG_NOSIGNAL, NULL,
0) = 184
** Source DB strace*
*sourcedb=# select * from pg_replication_slots ;*
slot_name | plugin | slot_type | datoid | database
| temporary | active | active_pid | xmin | catalog_xmin | restart_lsn |
confirmed_flush_lsn | wal_status | safe_wal_size
--------------------------------+----------+-----------+--------+----------+-----------+--------+------------+------+--------------+---------------+---------------------+---
---------+---------------
sub_omx_archive_big_tables_tci | pgoutput | logical | 16452 | sourcedb
| f | t | 76213 | | 78517101 | 9E98/E3D68AF8 |
9E98/E3D68B30 | reserved |
*sub_omx_archive_tci *| pgoutput | logical | 16452 |
sourcedb | f | t | *14312 *| | 78517101 |
9E98/E3D68AF8 | 9E98/E3D68B30 | reserved |
(2 rows)
postgres(at)sourcedb:~$ *strace -p 14312*
strace: Process 14312 attached
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 508) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
close(8) = 0
recvfrom(12, "d", 1, 0, NULL, NULL) = 1
recvfrom(12,
"\0\0\0&r\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\0\236\230\343\326\214\210\0\2z"...,
8192, 0, NULL, NULL) = 38
recvfrom(12, 0x7ffd430d1967, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
temporarily unavailable)
epoll_create1(EPOLL_CLOEXEC) = 8
epoll_ctl(8, EPOLL_CTL_ADD, 13, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801248,
u64=33801248}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 3, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801272,
u64=33801272}}) = 0
epoll_ctl(8, EPOLL_CTL_ADD, 12, {EPOLLIN|EPOLLERR|EPOLLHUP, {u32=33801296,
u64=33801296}}) = 0
epoll_wait(8, [{EPOLLIN, {u32=33801296, u64=33801296}}], 1, 2500) = 1
*This one always says resource temporarily unavailable and doesn't change.*
** FROM Publisher*
sourcedb=# select * from pg_replication_slots;
slot_name | plugin | slot_type | datoid | database
| temporary | active | active_pid | xmin | catalog_xmin | restart_lsn |
confirmed_flush_lsn | wal_status | safe_wal_size
--------------------------------+----------+-----------+--------+----------+-----------+--------+------------+------+--------------+---------------+---------------------+------------+---------------
sub_omx_archive_big_tables_tci | pgoutput | logical | 16452 | sourcedb
| f | t | 76213 | | 78517137 | 9E98/E3EAD248 |
9E98/E3EAD280 | reserved |
sub_omx_archive_tci | pgoutput | logical | 16452 | sourcedb
| f | t | 14312 | | 78517137 | 9E98/E3EAD248 |
9E98/E3EAD280 | reserved |
(2 rows)
sourcedb=# select * from pg_stat_replication;
pid | usesysid | usename | application_name |
client_addr | client_hostname | client_port | backend_start
| backend_xmin | state | sent_lsn | write_lsn | flush_lsn
| replay_lsn | write_lag | flush_lag | replay_lag | sync_priority |
sync_state | reply_time
--------+------------+----------+--------------------------------+---------------+-----------------+-------------+-------------------------------+--------------+-----------+---------------+---------------+---------------+---------------+-----------+-----------+------------+---------------+------------+-------------------------------
76213 | 16420 | dba | sub_omx_archive_big_tables_tci |
xx.xx.xxx.xxx | | 46048 | 2022-02-03
05:08:37.928898+09 | | streaming | 9E98/E3EAD3D8 |
9E98/E3EAD3D8 | 9E98/E3EAD3D8 | 9E98/E3EAD3D8 | | |
| 0 | async | 2022-02-03 18:28:32.905235+09
14312 | 16420 | dba | sub_omx_archive_tci |
xx.xx.xxx.xxx | | 11760 | 2022-02-03
13:46:25.855458+09 | | streaming | 9E98/E3EAD3D8 |
9E98/E3EAD3D8 | 9E98/E3EAD3D8 | 9E98/E3EAD3D8 | | |
| 0 | async | 2022-02-03 18:28:32.882874+09
(2 rows)
sourcedb=# select * from pg_stat_activity where application_name like
'%sub%';
datid | datname | pid | leader_pid | usesysid | usename |
application_name | client_addr | client_hostname | client_port |
backend_start| xact_start | query_start |
state_change | wait_event_type | wait_event | state |
backend_xid | backend_xmin | query |
backend_type
-------+---------+-------+------------+----------+----------+--------------------------------+---------------+-----------------+-------------+-------------------------------+------------+-------------------------------+-------------------------------+-----------------+---------------------+--------+-------------+--------------+---------------------------------------------------------+--------------
16452 | sourcedb| 14312 | | 16420 | dba |
sub_omx_archive_tci | xx.xx.xxx.xxx | |
11760 | 2022-02-03 13:46:25.855458+09| | 2022-02-03
13:46:25.860942+09 | 2022-02-03 13:46:25.862044+09 | Client |
WalSenderWaitForWAL | active | | | SELECT
pg_catalog.set_config('search_path', '', false); | walsender
16452 | sourcedb| 76213 | | 16420 | dba |
sub_omx_archive_big_tables_tci | xx.xx.xxx.xxx | |
46048 | 2022-02-03 05:08:37.928898+09| | 2022-02-03
05:08:37.937348+09 | 2022-02-03 05:08:37.938772+09 | Client |
WalSenderWaitForWAL | active | | | SELECT
pg_catalog.set_config('search_path', '', false); | walsender
(2 rows)
postgres(at)sourcehost:~$ ps -ef | grep postgres | grep wal
postgres 14312 171767 2 13:46 ? 00:06:51 postgres: walsender dba
xx.xx.xxx.xxx(11760) idle
postgres 76213 171767 1 05:08 ? 00:12:58 postgres: walsender dba
xx.xx.xxx.xxx(46048) idle
** FROM Subscriber*
* *pg_subscription_rel <- Always in initialize phase*
targetdb=# select * from pg_subscription_rel;
srsubid | srrelid | srsubstate | srsublsn
------------+------------+------------+---------------
3615756798 | 3322051793 | r | 9E7E/BF5F82D8
3615756798 | 3322051802 | r | 9E7E/C149BBD8
*3616584803 *| 3322052690 |* i * |
*3616584803 *| 3322052570 |* i * |
3616584803 | 3322052133 | *i * |
* *pg_stat_subscription*
targetdb=# select * from pg_stat_subscription ;
subid | subname | pid | relid |
received_lsn | last_msg_send_time | last_msg_receipt_time
| latest_end_lsn | latest_end_time
------------+--------------------------------+--------+-------+----------------+-------------------------------+-------------------------------+----------------+-------------------------------
3615756798 | sub_omx_archive_big_tables_tci | 178901 | |
9E98/E3E42DB0 | 2022-02-03 18:23:57.904696+09 | 2022-02-03
18:23:57.904768+09 | 9E98/E3E42DB0 | 2022-02-03 18:23:57.904696+09
3616584803 | sub_omx_archive_tci | 168277 | |
9E98/E3E42DB0 | 2022-02-03 18:23:57.904693+09 | 2022-02-03
18:23:57.904754+09 | 9E98/E3E42DB0 | 2022-02-03 18:23:57.904693+09
Sorry for the long message.
On Thu, Feb 3, 2022 at 5:25 PM Vijaykumar Jain <
vijaykumarjain(dot)github(at)gmail(dot)com> wrote:
>
>
> On Thu, 3 Feb 2022 at 12:44, Abhishek Bhola <
> abhishek(dot)bhola(at)japannext(dot)co(dot)jp> wrote:
>
>> Hi Vijaykumar,
>>
>> I checked the pg_subscription_rel and all the tables in that subscription
>> are in the state - i (initialize).
>> I also tried creating a new publication on the source DB with just one
>> table and tried to subscribe it, it doesn't work either.
>> However, when I try to subscribe it on some other DB than the one
>> mentioned above, it works.
>> By which I am deducing that publication and the source DB are okay, the
>> problem is on the target DB and it's subscription.
>> Maybe I will have to restart the DB as a last resort, but I am not sure
>> if that will solve the problem either.
>>
>>
> its a very verbose mail, so if it noisy, kindly ignore.
>
> else,
>
> can you check basic connectivity from the subscriber to publisher using
> psql and run a simple query ?
> can you share your "create publication" and "create subscription"
> commands/statements too please?
>
> i am attaching a general logical replication setup on a single server and
> put some scenarios where replication breaks and how to monitor and how to
> resume.
> and how that is monitored.
>
>
> postgres(at)controller:~$ tail db1/postgresql.conf db2/postgresql.conf
> ==> db1/postgresql.conf <==
>
> # Add settings for extensions here
> wal_level=logical
> archive_mode = on
> archive_command = '/bin/true'
> max_wal_size = 48MB
> min_wal_size = 32MB
> shared_buffers = 32MB
> port = 5001
> max_logical_replication_workers = 10
>
> ==> db2/postgresql.conf <==
> # Add settings for extensions here
> wal_level=logical
> archive_mode = on
> archive_command = '/bin/true'
> max_wal_size = 48MB
> min_wal_size = 32MB
> shared_buffers = 32MB
> port = 5002
> max_logical_replication_workers = 10
>
> postgres(at)controller:~$ pg_ctl -D db1 -l db1.log start
> waiting for server to start.... done
> server started
> postgres(at)controller:~$ pg_ctl -D db2 -l db2.log start
> waiting for server to start.... done
> server started
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# create table t1(id int primary key);
> CREATE TABLE
> postgres=# create table t2(id int); -- this will throw error on delete, no
> replica identity
> CREATE TABLE
> postgres=# insert into t1 select x from generate_series(1, 100) x;
> INSERT 0 100
> postgres=# insert into t2 select x from generate_series(1, 100) x;
> INSERT 0 100
> postgres=# checkpoint;
> CHECKPOINT
> postgres=# \q
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# create table t1(id int primary key);
> CREATE TABLE
> postgres=# create table t2(id int);
> CREATE TABLE
> postgres=# \q
> postgres(at)controller:~$ ps aux | grep -i postgres:
> postgres 1116 0.0 0.4 113632 8232 ? Ss 13:24 0:00
> postgres: checkpointer
> postgres 1117 0.0 0.2 113496 5868 ? Ss 13:24 0:00
> postgres: background writer
> postgres 1118 0.0 0.3 113496 6964 ? Ss 13:24 0:00
> postgres: walwriter
> postgres 1119 0.0 0.4 114032 8432 ? Ss 13:24 0:00
> postgres: autovacuum launcher
> postgres 1120 0.0 0.2 113496 4132 ? Ss 13:24 0:00
> postgres: archiver
> postgres 1121 0.0 0.2 72112 4896 ? Ss 13:24 0:00
> postgres: stats collector
> postgres 1122 0.0 0.3 113928 6732 ? Ss 13:24 0:00
> postgres: logical replication launcher
> postgres 1128 0.0 0.3 113496 5956 ? Ss 13:24 0:00
> postgres: checkpointer
> postgres 1129 0.0 0.3 113496 5916 ? Ss 13:24 0:00
> postgres: background writer
> postgres 1130 0.0 0.3 113496 6952 ? Ss 13:24 0:00
> postgres: walwriter
> postgres 1131 0.0 0.4 114032 8384 ? Ss 13:24 0:00
> postgres: autovacuum launcher
> postgres 1132 0.0 0.2 113496 4160 ? Ss 13:24 0:00
> postgres: archiver
> postgres 1133 0.0 0.2 72112 4868 ? Ss 13:24 0:00
> postgres: stats collector
> postgres 1134 0.0 0.3 113928 6804 ? Ss 13:24 0:00
> postgres: logical replication launcher
> postgres 1186 0.0 0.0 8164 724 pts/0 S+ 13:26 0:00 grep -i
> postgres:
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# create publication mypub for all tables
>
> postgres=# create publication mypub for all tables with
> (publish='insert,update,delete,truncate');
> CREATE PUBLICATION
> postgres=# \q
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# create subscription mysub connection 'port=5001' publication
> mypub;
> NOTICE: created replication slot "mysub" on publisher
> CREATE SUBSCRIPTION
> postgres=# select count(1) from t1;
> count
> -------
> 100
> (1 row)
>
> postgres=# select count(1) from t2;
> count
> -------
> 100
> (1 row)
>
> postgres=# \q
>
> postgres(at)controller:~$ ps aux | grep postgres: # strace the below pids
> for movement
> postgres 1195 0.0 0.7 114800 14744 ? Ss 13:27 0:00
> postgres: logical replication worker for subscription 16392
> postgres 1196 0.0 0.7 114728 14676 ? Ss 13:27 0:00
> postgres: walsender postgres [local] START_REPLICATION
>
> # logical replication slot is active(=t) with an active pid (which we
> strace) and has movement of lsn (= healthy)
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_replication_slots;
> -[ RECORD 1 ]-------+----------
> slot_name | mysub
> plugin | pgoutput
> slot_type | logical
> datoid | 13726
> database | postgres
> temporary | f
> active | t
> active_pid | 1196
> xmin |
> catalog_xmin | 740
> restart_lsn | 0/20308F0
> confirmed_flush_lsn | 0/2030928
> wal_status | reserved
> safe_wal_size |
> two_phase | f
>
> postgres=# \q
>
> #strace publication worker process , check if it is moving fine
> root(at)controller:~# strace -p 1196
> strace: Process 1196 attached
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 29577)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\t(\0\2z\27H\376\271\323\0", 23, 0,
> NULL, 0) = 23
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 29999)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\t(\0\2z\27J\311_\352\0", 23, 0, NULL,
> 0) = 23
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 29999)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\t(\0\2z\27L\224?s\0", 23, 0, NULL, 0) =
> 23
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\0\0\0\2\3\t(\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228944, u64=94283776310736}}], 1, 30000)
> = 1
> read(10,
> "\27\0\0\0\0\0\0\0\0\0\0\0^\4\0\0p\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024)
> = 128
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\0\3\2\0\0\0\0\0\3\0\0\0\0\0\0\2365\0\0\210\n\0\0"...,
> 8192, 196608) = 8192
> stat("pg_logical/snapshots/0-2030928.snap", 0x7fff98dfb6b0) = -1 ENOENT
> (No such file or directory)
> unlink("pg_logical/snapshots/0-2030928.snap.1196.tmp") = -1 ENOENT (No
> such file or directory)
> openat(AT_FDCWD, "pg_logical/snapshots/0-2030928.snap.1196.tmp",
> O_WRONLY|O_CREAT|O_EXCL, 0600) = 7
> write(7,
> "\1\340\241Q\346\223#\367\4\0\0\0\200\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 128) = 128
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> rename("pg_logical/snapshots/0-2030928.snap.1196.tmp",
> "pg_logical/snapshots/0-2030928.snap") = 0
> openat(AT_FDCWD, "pg_logical/snapshots/0-2030928.snap", O_RDWR) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state.tmp", O_WRONLY|O_CREAT|O_EXCL,
> 0600) = 7
> write(7,
> "\241\34\5\1W\23\376Y\2\0\0\0\270\0\0\0mysub\0\0\0\0\0\0\0\0\0\0\0"...,
> 200) = 200
> fsync(7) = 0
> close(7) = 0
> rename("pg_replslot/mysub/state.tmp", "pg_replslot/mysub/state") = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state", O_RDWR) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot/mysub", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\0\3\2\0\0\0\0\0\3\0\0\0\0\0\0\2365\0\0\210\n\0\0"...,
> 8192, 196608) = 8192
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\t`\0\2z\27M\223\336\351\0", 23, 0,
> NULL, 0) = 23
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t`\0\0\0\0\2\3\t`\0\0\0\0\2\3\t`\0\2z"..., 8192, 0,
> NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\t\330\0\2z\27M\223\341P\0", 23, 0,
> NULL, 0) = 23
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\t\330\0\0\0\0\2\3\t\330\0\0\0\0\2\3\t\330\0\2z"...,
> 8192, 0, NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228944, u64=94283776310736}}], 1, 30000)
> = 1
> read(10,
> "\27\0\0\0\0\0\0\0\0\0\0\0^\4\0\0p\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024)
> = 128
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\0\3\2\0\0\0\0\0\3\0\0\0\0\0\0\2365\0\0\210\n\0\0"...,
> 8192, 196608) = 8192
> stat("pg_logical/snapshots/0-20309D8.snap", 0x7fff98dfb6b0) = -1 ENOENT
> (No such file or directory)
> unlink("pg_logical/snapshots/0-20309D8.snap.1196.tmp") = -1 ENOENT (No
> such file or directory)
> openat(AT_FDCWD, "pg_logical/snapshots/0-20309D8.snap.1196.tmp",
> O_WRONLY|O_CREAT|O_EXCL, 0600) = 7
> write(7,
> "\1\340\241Q\336\33\320]\4\0\0\0\200\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 128) = 128
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> rename("pg_logical/snapshots/0-20309D8.snap.1196.tmp",
> "pg_logical/snapshots/0-20309D8.snap") = 0
> openat(AT_FDCWD, "pg_logical/snapshots/0-20309D8.snap", O_RDWR) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state.tmp", O_WRONLY|O_CREAT|O_EXCL,
> 0600) = 7
> write(7,
> "\241\34\5\1\353A\375\303\2\0\0\0\270\0\0\0mysub\0\0\0\0\0\0\0\0\0\0\0"...,
> 200) = 200
> fsync(7) = 0
> close(7) = 0
> rename("pg_replslot/mysub/state.tmp", "pg_replslot/mysub/state") = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state", O_RDWR) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot/mysub", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> openat(AT_FDCWD, "pg_replslot", O_RDONLY) = 7
> fsync(7) = 0
> close(7) = 0
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> sendto(9, "d\0\0\0\26k\0\0\0\0\2\3\n\20\0\2z\27M\346W\275\0", 23, 0, NULL,
> 0) = 23
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 24596)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\n\20\0\0\0\0\2\3\n\20\0\0\0\0\2\3\n\20\0\2z"...,
> 8192, 0, NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228944, u64=94283776310736}}], 1, 30000)
> = 1
> read(10,
> "\27\0\0\0\0\0\0\0\0\0\0\0\237\5\0\0p\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 1024) = 128
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\0\3\2\0\0\0\0\0\3\0\0\0\0\0\0\2365\0\0\210\n\0\0"...,
> 8192, 196608) = 8192
> pread64(6, "\r\321\5\0\1\0\0\0\0
> \3\2\0\0\0\0\21\10\0\0\0\0\0\0005\0\0forei"..., 8192, 204800) = 8192
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6, "\r\321\5\0\1\0\0\0\0(at)\3\2\0\0\0\0U\7\0\0\0\0\0\0\0\0\0\0\0001\0\33"...,
> 8192, 212992) = 8192
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0`\3\2\0\0\0\0a\16\0\0\0\0\0\0\v\30\0\337\4\0\0\203"...,
> 8192, 221184) = 8192
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\200\3\2\0\0\0\0\225\5\0\0\0\0\0\0\0\0\0\0\0>\0F"...,
> 8192, 229376) = 8192
> sendto(9,
> "d\0\0\0002w\0\0\0\0\2\3\n\20\0\0\0\0\2\3\n\20\0\2z\27N]\200\371B\0"...,
> 51, 0, NULL, 0) = 51
> brk(0x55c0270d1000) = 0x55c0270d1000
> brk(0x55c0270ca000) = 0x55c0270ca000
> openat(AT_FDCWD, "base/13726/3455", O_RDWR) = 7
> pread64(7, "\0\0\0\0h;g\1\0\0\0\0\330\2\360\24\360\37\4 \0\0\0\0\340\237
> \0\320\237 \0"..., 8192, 8192) = 8192
> sendto(9,
> "d\0\0\0007w\0\0\0\0\2\3\233\370\0\0\0\0\2\3\233\370\0\2z\27N]\205\334C\0"...,
> 56, 0, NULL, 0) = 56
> rt_sigprocmask(SIG_SETMASK, [URG], NULL, 8) = 0
> sendto(8,
> "\27\0\0\0\220\0\0\0mysub\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 144,
> 0, NULL, 0) = 144
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\233\370\0\0\0\0\2\3\233\370\0\0\0\0\2\3\233\370\0\2z"...,
> 8192, 0, NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfc077, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228920, u64=94283776310712}}], 1, 30000)
> = 1
> recvfrom(9, "d", 1, 0, NULL, NULL) = 1
> recvfrom(9,
> "\0\0\0&r\0\0\0\0\2\3\233\370\0\0\0\0\2\3\233\370\0\0\0\0\2\3\233\370\0\2z"...,
> 8192, 0, NULL, NULL) = 38
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> epoll_wait(4, [{EPOLLIN, {u32=654228944, u64=94283776310736}}], 1, 30000)
> = 1
> read(10,
> "\27\0\0\0\0\0\0\0\0\0\0\0^\4\0\0p\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"..., 1024)
> = 128
> recvfrom(9, 0x7fff98dfbf07, 1, 0, NULL, NULL) = -1 EAGAIN (Resource
> temporarily unavailable)
> pread64(6,
> "\r\321\5\0\1\0\0\0\0\200\3\2\0\0\0\0\225\5\0\0\0\0\0\0\0\0\0\0\0>\0F"...,
> 8192, 229376) = 8192
> stat("pg_logical/snapshots/0-2039BF8.snap", 0x7fff98dfb6b0) = -1 ENOENT
> (No such file or directory)
> unlink("pg_logical/snapshots/0-2039BF8.snap.1196.tmp") = -1 ENOENT (No
> such file or directory)
> openat(AT_FDCWD, "pg_logical/snapshots/0-2039BF8.snap.1196.tmp",
> O_WRONLY|O_CREAT|O_EXCL, 0600) = 12
> write(12,
> "\1\340\241Q\326\370d\25\4\0\0\0\204\0\0\0\2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"...,
> 132) = 132
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
> rename("pg_logical/snapshots/0-2039BF8.snap.1196.tmp",
> "pg_logical/snapshots/0-2039BF8.snap") = 0
> openat(AT_FDCWD, "pg_logical/snapshots/0-2039BF8.snap", O_RDWR) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_logical/snapshots", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state.tmp", O_WRONLY|O_CREAT|O_EXCL,
> 0600) = 12
> write(12,
> "\241\34\5\1>-\275R\2\0\0\0\270\0\0\0mysub\0\0\0\0\0\0\0\0\0\0\0"..., 200)
> = 200
> fsync(12) = 0
> close(12) = 0
> rename("pg_replslot/mysub/state.tmp", "pg_replslot/mysub/state") = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state", O_RDWR) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot/mysub", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state.tmp", O_WRONLY|O_CREAT|O_EXCL,
> 0600) = 12
> write(12,
> "\241\34\5\1\237\331q|\2\0\0\0\270\0\0\0mysub\0\0\0\0\0\0\0\0\0\0\0"...,
> 200) = 200
> fsync(12) = 0
> close(12) = 0
> rename("pg_replslot/mysub/state.tmp", "pg_replslot/mysub/state") = 0
> openat(AT_FDCWD, "pg_replslot/mysub/state", O_RDWR) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot/mysub", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
> openat(AT_FDCWD, "pg_replslot", O_RDONLY) = 12
> fsync(12) = 0
> close(12) = 0
>
>
> *#check the subscription worker strace similarly *
> strace -p 1195
>
>
> *# check the state og subscription*
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_subscription_rel;
> -[ RECORD 1 ]---------
> srsubid | 16392
> srrelid | 16389
> *srsubstate | r*
> srsublsn | 0/20308F0
> -[ RECORD 2 ]---------
> srsubid | 16392
> srrelid | 16384
> *srsubstate | r*
> srsublsn | 0/2030928
>
> postgres=# select * from pg_stat_subscription;
> -[ RECORD 1 ]---------+---------------------------------
> subid | 16392
> subname | mysub
> *pid | 1195*
> relid |
> received_lsn | 0/2030928
> *last_msg_send_time | 2022-02-03 13:30:10.969066+05:30*
> *last_msg_receipt_time | 2022-02-03 13:30:10.971322+05:30*
> latest_end_lsn | 0/2030928
> latest_end_time | 2022-02-03 13:30:10.969066+05:30
>
> postgres=# \q
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_stat_replication;
> -[ RECORD 1 ]----+---------------------------------
> pid | 1196
> usesysid | 10
> usename | postgres
> application_name | mysub
> client_addr |
> client_hostname |
> client_port | -1
> backend_start | 2022-02-03 13:27:40.690802+05:30
> backend_xmin |
> state | streaming
> sent_lsn | 0/2030928
> write_lsn | 0/2030928
> flush_lsn | 0/2030928
> replay_lsn | 0/2030928
> write_lag |
> flush_lag |
> replay_lag |
> sync_priority | 0
> sync_state | async
> reply_time | 2022-02-03 13:30:41.041007+05:30
>
>
> *#i make ddl change which will break the subscription, as table not in
> sync*
> postgres=# alter table t2 add column col2 int default 0;
> ALTER TABLE
> postgres=# select * from pg_stat_replication;
> -[ RECORD 1 ]----+---------------------------------
> pid | 1196
> usesysid | 10
> usename | postgres
> application_name | mysub
> client_addr |
> client_hostname |
> client_port | -1
> backend_start | 2022-02-03 13:27:40.690802+05:30
> backend_xmin |
> state | streaming
> sent_lsn | 0/2039BF8
> write_lsn | 0/2039BF8
> flush_lsn | 0/2039BF8
> replay_lsn | 0/2039BF8
> write_lag | 00:00:00.001365
> flush_lag | 00:00:00.001365
> replay_lag | 00:00:00.001365
> sync_priority | 0
> sync_state | async
> reply_time | 2022-02-03 13:31:11.010197+05:30
>
> postgres=# \q
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# insert into t2(id,col2) select 0,0 from generate_series(1, 100)
> x;
> INSERT 0 100
> postgres=# \q
>
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# select count(1) from t2;
> count
> -------
> * 100 -- note this should be 200, but it did not add, so we need to
> check for errors*
> (1 row)
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_stat_subscription;
> -[ RECORD 1 ]---------+------
> subid | 16392
> subname | mysub
> *pid | ----no pid, subscription is not active*
> relid |
> received_lsn |
> *last_msg_send_time |*
> *last_msg_receipt_time |*
> latest_end_lsn |
> latest_end_time |
>
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_stat_replication;
> (0 rows)
>
> postgres=# select * from pg_replication_slots;
> -[ RECORD 1 ]-------+----------
> slot_name | mysub
> plugin | pgoutput
> slot_type | logical
> datoid | 13726
> database | postgres
> temporary | f
> *active | f -- active =f , publication broken, check logs,
> (strace would have exited as no process died)*
> active_pid |
> xmin |
> catalog_xmin | 741
> restart_lsn | 0/2039BF8
> confirmed_flush_lsn | 0/2039C30
> wal_status | reserved
> safe_wal_size |
> two_phase | f
>
> postgres=# \q
> postgres(at)controller:~$ tail -100 db1.log
> 2022-02-03 13:32:06.873 IST [1456] STATEMENT: START_REPLICATION SLOT
> "mysub" LOGICAL 0/0 (proto_version '2', publication_names '"mypub"')
> 2022-02-03 13:32:11.890 IST [1458] LOG: starting logical decoding for
> slot "mysub"
> 2022-02-03 13:32:11.890 IST [1458] DETAIL: Streaming transactions
> committing after 0/2039C30, reading WAL from 0/2039BF8.
> 2022-02-03 13:32:11.890 IST [1458] STATEMENT: START_REPLICATION SLOT
> "mysub" LOGICAL 0/0 (proto_version '2', publication_names '"mypub"')
> 2022-02-03 13:32:11.891 IST [1458] LOG: logical decoding found consistent
> point at 0/2039BF8
> 2022-02-03 13:32:11.891 IST [1458] DETAIL: There are no running
> transactions.
> 2022-02-03 13:32:11.891 IST [1458] STATEMENT: START_REPLICATION SLOT
> "mysub" LOGICAL 0/0 (proto_version '2', publication_names '"mypub"')
> 2022-02-03 13:32:11.892 IST [1458] LOG: could not send data to client:
> Broken pipe
> 2022-02-03 13:33:02.074 IST [1482] CONTEXT: slot "mysub", output plugin
> "pgoutput", in the change callback, associated LSN 0/203AAD8
> 2022-02-03 13:33:02.074 IST [1482] STATEMENT: START_REPLICATION SLOT
> "mysub" LOGICAL 0/0 (proto_version '2', publication_names '"mypub"')
>
> postgres(at)controller:~$ tail -100 db2.log
> 2022-02-03 13:24:42.101 IST [1126] LOG: starting PostgreSQL 14.1 (Ubuntu
> 14.1-2.pgdg20.04+1) on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu
> 9.3.0-17ubuntu1~20.04) 9.3.0, 64-bit
> 2022-02-03 13:24:42.101 IST [1126] LOG: listening on IPv6 address "::1",
> port 5002
> 2022-02-03 13:24:42.101 IST [1126] LOG: listening on IPv4 address
> "127.0.0.1", port 5002
> 2022-02-03 13:24:42.104 IST [1126] LOG: listening on Unix socket
> "/var/run/postgresql/.s.PGSQL.5002"
> 2022-02-03 13:24:42.109 IST [1127] LOG: database system was shut down at
> 2022-02-03 13:24:25 IST
> 2022-02-03 13:24:42.112 IST [1126] LOG: database system is ready to
> accept connections
> 2022-02-03 13:27:40.690 IST [1195] LOG: logical replication apply worker
> for subscription "mysub" has started
> 2022-02-03 13:27:40.694 IST [1197] LOG: logical replication table
> synchronization worker for subscription "mysub", table "t2" has started
> 2022-02-03 13:27:40.704 IST [1199] LOG: logical replication table
> synchronization worker for subscription "mysub", table "t1" has started
> 2022-02-03 13:27:40.732 IST [1197] LOG: logical replication table
> synchronization worker for subscription "mysub", table "t2" has finished
> 2022-02-03 13:27:40.746 IST [1199] LOG: logical replication table
> synchronization worker for subscription "mysub", table "t1" has finished
> 2022-02-03 13:31:56.830 IST [1195] ERROR: logical replication target
> relation "public.t2" is missing replicated column: "col2"
> 2022-02-03 13:31:56.831 IST [1126] LOG: background worker "logical
> replication worker" (PID 1195) exited with exit code 1
>
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# alter table t2 add column col2 int default 0;
> ALTER TABLE
> postgres=# \q
>
> postgres(at)controller:~$ tail -10 db2.log
> 2022-02-03 13:33:27.156 IST [1495] LOG: logical replication apply worker
> for subscription "mysub" has started
> 2022-02-03 13:33:27.164 IST [1495] ERROR: logical replication target
> relation "public.t2" is missing replicated column: "col2"
> 2022-02-03 13:33:27.165 IST [1126] LOG: background worker "logical
> replication worker" (PID 1495) exited with exit code 1
> 2022-02-03 13:33:32.175 IST [1497] LOG: logical replication apply worker
> for subscription "mysub" has started
> 2022-02-03 13:33:32.182 IST [1497] ERROR: logical replication target
> relation "public.t2" is missing replicated column: "col2"
> 2022-02-03 13:33:32.183 IST [1126] LOG: background worker "logical
> replication worker" (PID 1497) exited with exit code 1
> 2022-02-03 13:33:37.194 IST [1502] LOG: logical replication apply worker
> for subscription "mysub" has started
> 2022-02-03 13:33:37.201 IST [1502] ERROR: logical replication target
> relation "public.t2" is missing replicated column: "col2"
> 2022-02-03 13:33:37.202 IST [1126] LOG: background worker "logical
> replication worker" (PID 1502) exited with exit code 1
> 2022-02-03 13:33:42.212 IST [1504] LOG: logical replication apply worker
> for subscription "mysub" has started
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# \x
> Expanded display is on.
> postgres=# select * from pg_subscription_rel;
> -[ RECORD 1 ]---------
> srsubid | 16392
> srrelid | 16389
> srsubstate | r
> srsublsn | 0/20308F0
> -[ RECORD 2 ]---------
> srsubid | 16392
> srrelid | 16384
> srsubstate | r
> srsublsn | 0/2030928
>
> postgres=# select * from pg_stat_subscription;
> -[ RECORD 1 ]---------+---------------------------------
> subid | 16392
> subname | mysub
> *pid | 1504*
> relid |
> received_lsn | 0/2040490
> last_msg_send_time | 2022-02-03 13:33:42.235423+05:30
> last_msg_receipt_time | 2022-02-03 13:33:42.235432+05:30
> latest_end_lsn | 0/2040490
> latest_end_time | 2022-02-03 13:33:42.235423+05:30
>
> postgres=# \q
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# select count(1) from t2;
> count
> -------
> 200
> (1 row)
>
> postgres=# \q
> postgres(at)controller:~$ ps aux | grep postgres: *# we need to strace
> the below new pids/process , as old ones were terminated*
>
> postgres 1504 0.0 0.7 114904 14972 ? Ss 13:33 0:00
> postgres: logical replication worker for subscription 16392
> postgres 1505 0.0 0.8 114864 15952 ? Ss 13:33 0:00
> postgres: walsender postgres [local] START_REPLICATION
> postgres 1513 0.0 0.0 8160 672 pts/0 S+ 13:34 0:00 grep
> postgres:
>
> *# check everything should be working.*
> postgres(at)controller:~$ psql -p 5001
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# delete from t2; -- as said earlier, delete would fail, needs a
> fix
> ERROR: cannot delete from table "t2" because it does not have a replica
> identity and publishes deletes
> HINT: To enable deleting from the table, set REPLICA IDENTITY using ALTER
> TABLE.
> postgres=# delete from t1;
> DELETE 100
> postgres=# alter table t2 replica identity full; -- since no primary key
> or unique key
> ALTER TABLE
> postgres=# delete from t2;
> DELETE 200
> postgres=# select count(1) from t2;
> count
> -------
> 0
> (1 row)
>
> postgres=# select count(1) from t1;
> count
> -------
> 0
> (1 row)
>
> postgres=# \q
> postgres(at)controller:~$ psql -p 5002
> psql (14.1 (Ubuntu 14.1-2.pgdg20.04+1))
> Type "help" for help.
>
> postgres=# select count(1) from t1;
> count
> -------
> 0
> (1 row)
>
> postgres=# select count(1) from t2;
> count
> -------
> 0
> (1 row)
>
>
> *so in short,*
> *share your*
>
> from publisher
> select * from pg_replication_slots;
> select * from pg_stat_replication;
> select * from pg_stat_activity;
> ps aux | grep postgres: # ( publisher)
>
> from subscriber
> select * from pg_stat_subscription;
> select * from pg_subscription_rel;
> ps aux | grep postgres: # ( subscriber)
>
> *and logs of publisher and subscriber db (for errors, it there are no pids
> for above, logs should show errors)*
>
>
>
>
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