Feature Request: Parallel Upstream Query Mode like AdGuard Home

[EliteSalman]

Query all configured forwarders simultaneously and return the first successful response, instead of querying them sequentially or with a fixed concurrency limit.
Similar to AdGuard Home's "Parallel requests" option.

[ShreyasZare]

Thanks for asking. You can already do that by setting the Forwarder Concurrency to the number of forwarder you have.

But it is recommended to use Forwarder Concurrency with default value of 2. The DNS server uses machine learning and will figure out which forwarders are answering faster and automatically use them most of the time. So the default value of 2 prevents usage of extra resources which do not really help improve performance due to the machine learning algorithm.

[EliteSalman]

The machine learning do this by per domain or all domains average?

[ShreyasZare]

With forwarding, the stats are kept per forwarder. The domain names that were resolved do not matter. The algorithm just keeps learning which forwarder works fast without errors and uses it most of the time.

For recursive resolution, the NS records for all domain names being resolved have stats attached to them. So in this case, the algorithm works per zone and uses the best performing NS record for resolution most of the times.