Re: PG synchronous replication and unresponsive slave

any help on this is much appreciated.

thanks,
Manoj


On 01/11/2012 01:50 PM, Manoj Govindassamy wrote:
> Hi,
>
> I have a PG 9.1.2 Master <--> Slave with synchronous replication
> setup. They are all working fine as expected. I do have a case where I
> want to flip Master to non replication mode whenever its slave is not
> responding. I have set replication_timeout to 5s and whenever salve is
> not responding for for more than 5s, i see the master detecting it.
> But, the transactions on the master is stuck till the slave comes
> back. To get over it, I reloaded the config on master with
> synchronous_commit = local. Further transactions on the master are
> going thru fine with this local commits turned on.
>
> Here are my questions:
>
> 1. Transaction which was stuck right when slave going away never went
> thru even after I reloaded master's config with local commit on. I do
> see all new transactions on master are going thru fine, except the one
> which was stuck initially. How to get this stuck transaction complete
> or return with error.
>
> 2. Whenever there is a problem with slave, I have to manually reload
> master's config with local commit turned on to get master go forward.
> Is there any automated way to reload this config with local commit on
> on slave's unresponsiveness ? tcp connection timeouts, replication
> timeouts all detect the failures, but i want to run some corrective
> action on these failure detection.
>