Thread: [ADMIN] Postgres - Replication

Hi there, I have used Postgres with Master/Slave setup and I've used streaming replication to keep the slave instance up to date with Master. Now I want to have a DR site and ensure the secondary site also has up to date data. What is the best replication method recommended for this purpose? Thanks, Jason

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Thanks Samed.

Perhaps the question may not be clear and sorry about that.

What I'm looking for is an option to scale the solution to multi site
configuration where two different sites located in different geographical
locations to be able to maintain data in sync.

Currently I'm using synchronous streaming replication and one option I've
evaluated is cascading replication.



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Here is bit more background of the work I've done and issues around them.

What I'm looking for is an option to scale the solution to multi site
configuration where two different sites located in different geographical
locations to be able to maintain data in sync.

Currently I'm using synchronous streaming replication and one option I've
evaluated is cascading replication. Issues or concerns so far I have with
this setup are;

1. Only supports async replication
2. Automatic failover script I have built (have been using for several years
now without an issue) would 3. have to be enhanced to be intelligent to
switch to new master in primary site in the event primary fails.
4. All the standby servers including cascading standby would not allow
writes.


Happy to understand if there are implementations done by an expert in this
forum with solutions for these concerns.

Please note that I'm open for any other replication method that would allow
better scalability. One of the best option would be to have Multi-master
setup though I haven't seen any documentation around the support for such
capability by Postgres.

Thanks,
Jason



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I have some experience with BDR. Works fine.

Alvaro Aguayo
Jefe de Operaciones
Open Comb Systems E.I.R.L.

Oficina: (+51-1) 3377813 | RPM: #034252 / (+51) 995540103  | RPC: (+51) 954183248
Website: www.ocs.pe

----- Original Message -----
From: "bricklen" <bricklen@gmail.com>
To: "jasoninmel" <jasoninmel+1@gmail.com>
Cc: pgsql-admin@postgresql.org
Sent: Saturday, 18 March, 2017 11:41:48 AM
Subject: Re: [ADMIN] Postgres - Replication





On Thu, Mar 16, 2017 at 8:34 PM, jasoninmel < jasoninmel+1@gmail.com > wrote:



Please note that I'm open for any other replication method that would allow
better scalability. One of the best option would be to have Multi-master
setup though I haven't seen any documentation around the support for such
capability by Postgres.


Postgresql doesn't support multi-master in the core project but there are options available. Have you come across
BiDirectionalReplication (BDR) yet? https://2ndquadrant.com/en/resources/bdr/  

Thank you very much bricklen for the recommending BDR. It looks like a
potential candidate and will surely give it a try.



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I am using Bucardo.

It is working fine. It has been runinning for 5 years across 50 replicated nodes.

I strongly recommend Bucardo for master-master replication.

It is trigger based asynchronous replication system.

Regards

Om Prakash

On Saturday, 18 March 2017 10:24 PM, Alvaro Aguayo Garcia-Rada <aaguayo@opensysperu.com> wrote:

I have some experience with BDR. Works fine.

Alvaro Aguayo
Jefe de Operaciones
Open Comb Systems E.I.R.L.

Oficina: (+51-1) 3377813 | RPM: #034252 / (+51) 995540103  | RPC: (+51) 954183248
Website: www.ocs.pe

----- Original Message -----
From: "bricklen" <bricklen@gmail.com>
To: "jasoninmel" <jasoninmel+1@gmail.com>
Cc: pgsql-admin@postgresql.org
Sent: Saturday, 18 March, 2017 11:41:48 AM
Subject: Re: [ADMIN] Postgres - Replication





On Thu, Mar 16, 2017 at 8:34 PM, jasoninmel < jasoninmel+1@gmail.com > wrote:



Please note that I'm open for any other replication method that would allow
better scalability. One of the best option would be to have Multi-master
setup though I haven't seen any documentation around the support for such
capability by Postgres.


Postgresql doesn't support multi-master in the core project but there are options available. Have you come across BiDirectional Replication (BDR) yet? https://2ndquadrant.com/en/resources/bdr/

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