[pgpool-hackers: 2955] Re: Time to remove replication_mode ?

[Jesper Pedersen]

Hi,

On 08/15/2018 10:21 PM, Tatsuo Ishii wrote:
>> Hi,
>>
>> I know this is controversial, but is it time to remove
>> replication_mode and friends from pgpool ?
>>
>> master_slave_mode has been around for a while, and by removing
>> replication_mode from the configuration it will force people to setup
>> streaming or logical replication instead.
>>
>> This will hopefully lead to fewer data corruption cases, since all
>> community supported PostgreSQL versions has streaming replication now.
>>
>> I would be willing to write a patch for this, or at least a patch that
>> let people know to look at master_slave_mode instead.
>>
>> This is of course for pgpool-4.
>>
>> Feedback most welcome.
> 
> I think we should not remove replication_mode for now.
> 
> PostgreSQL developers are now trying to implement replication/sharding
> clusters using FDW. In the architecture, FDW sends queries to each
> cluster node. But right now it lacks the feature of distributed
> transaction manager, and it might be possible for Pgpool-II do
> something in this area possibly with modified replication_mode.
> 
> Of course my idea is pretty vague at this point but at least I do not
> want to remove replication_mode until the idea becomes clear and find
> replication_mode is useless in this area.
> 

Ok, understood.

Would the attached patch be ok to include ?

Thanks for your feedback !

Best regards,
  Jesper
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