From: | AYahorau(at)ibagroup(dot)eu |
---|---|
To: | Rajni Baliyan <saan654(at)gmail(dot)com> |
Cc: | MikalaiKeida(at)ibagroup(dot)eu, pgsql-admin <pgsql-admin(at)postgresql(dot)org> |
Subject: | Re: Logical replication monitoring |
Date: | 2018-08-14 13:50:08 |
Message-ID: | OFD54185C3.17E1E937-ON432582E9.004B59FA-432582E9.004C0015@iba.by |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-admin |
Hello,
Sorry for being persistent,
Could you please explain how to use these commands? Could you please
provide an example?
Best regards,
Andrei Yahorau
From: Rajni Baliyan <saan654(at)gmail(dot)com>
To: AYahorau(at)ibagroup(dot)eu,
Cc: pgsql-admin <pgsql-admin(at)postgresql(dot)org>, MikalaiKeida(at)ibagroup(dot)eu
Date: 14/08/2018 06:24
Subject: Re: Logical replication monitoring
Check below link. Might help you.
https://www.postgresql.org/docs/10/static/replication-origins.html
On Mon, Aug 13, 2018 at 8:16 PM, <AYahorau(at)ibagroup(dot)eu> wrote:
Hello!
Thank you for your suggestion.
I afraid this approach is not suitable for me. As a rule my postgresql
log on subscriber side contains a bunch of the following entries:
ERROR: terminating logical replication worker due to timeout
00000 LOG: worker process: logical replication worker for subscription
24578 (PID 6217) exited with exit code 1
How should I handle this situation?
As I understand this is quite normal situation. But why is severity for it
an ERROR ?
I have another assumption. Could you correct me if I am wrong.
I found out in the source code that logical replication worker termination
depends on wal_receiver_timeout paramer.
So I propose setting wal_receiver_timeout to 0.
In this case I think that monitoring of the following views
pg_stat_subscription, pg_publication and pg_stat_replication is enough.
In case if there is some problem with connection or with replication
pg_stat_replication will show nothing because wal sender will not be
working otherwise it will give some information.
Am I right? Are there any vulnerabilities in this approach ?
Best regards,
Andrei Yahorau
From: Andrei Yahorau/IBA
To: pgsql-admin(at)postgresql(dot)org,
Cc: Mikalai Keida/IBA(at)IBA
Date: 10/08/2018 13:05
Subject: Logical replication monitoring
Hello PostgreSQL Community!
I configured logical replication for PostgreSQL 10.4 on 2 machines, set
wal_level to logical, created a publication on master node and created a
subscription on standby node according to the PostgreSQL documentation.
Could you please suggest an approach for replication state monitoring.
According to my experience the monitoring of pg_stat_subscription and
pg_publication, pg_replication_slots unfortunately is not enough for this
aim. Moreover standby database does not prohibit write operations by
default and it can lead to some inconsistency between these databases.
For example a chain of queries as
SELECT pg_is_is_recovery(),
SELECT * FROM pg_stat_replication and
SELECT * FROM pg_stat_wal_receiver
provide insight into replication state for hot_standby replication.
So is there a reliable way of replication state monitoring for logical
replication?
Best regards,
Andrei Yahorau
From | Date | Subject | |
---|---|---|---|
Next Message | Debraj Manna | 2018-08-14 18:50:27 | pg_upgrade failing with error pg_resetxlog no such file |
Previous Message | Anjul Tyagi | 2018-08-14 12:07:42 | Re: logical Replication |