Hi David,
I saw similar solutions using DNS to add / remove node from cluster,
the client side spin up a go routine keep resolving the DNS in an
interval, if it find new ip appears in DNS record, add it to the pool ,
when ip address disappear from the DNS, it removes from the pool.
and it seems to me that DNS is cached in os level.
On Wednesday, September 14, 2016 at 12:57:45 AM UTC+10, david...@ft.com
wrote:
>
> Hi,
>
> We've got a HTTP client connecting to an active-passive cluster setup,
> controlled through a traffic managed DNS entry and a good-to-go signal on
> each cluster. When the good-to-go fails, the DNS switches to point at the
> passive cluster. The client in question has no knowledge of whether a
> failover has occurred, it's just hitting an endpoint on the traffic managed
> address.
>
> The client is resolving the DNS correctly and opening a TCP connection.
> However, when the failover occurs, the TCP connection to the old cluster
> stays active because of Go's persistent connections. The connection is not
> idle (it still makes scheduled requests to the endpoint via its IP address)
> and so is not closed when we close all idle connections.
>
> Is there some way to set a maximum age for the TCP connection?
>
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