Re: Lag in asynchronous replication

Hi Michael,

Are you asking to have slave with synchronous replication?

Regards,
SUBHANKAR CHATTOPADHYAY

On 24 Mar 2017 09:33, "Michael Paquier" <michael(dot)paquier(at)gmail(dot)com> wrote:

> On Thu, Mar 23, 2017 at 11:37 PM, Subhankar Chattopadhyay
> <subho(dot)atg(at)gmail(dot)com> wrote:
> > in case of automated failover i want to check if slave is lagging from
> > master and only if it is in sync, i want to do failover. But I am
> working in
> > a virtual cloud environment so by that time the master VM may not be
> > available to me. How can i check the lag in that case ?
>
> Is your environment switching dynamically to async if the lag is too
> important? If not, once you have reached a sync state, the master
> would wait for all transactions commits to complete on the slave, so
> once the client has received a commit confirmation you have the
> guarantee that the data is already flushed on the slave. In this case
> you don't need to know what happens on the master.
> --
> Michael
>