• Program: dnsdist
• Issue type: Feature request

If you need to purge multiple (unrelated) names, the only solution is to call expungeByName for each name. expungeByName iterates over each cache entry, so if you have a large cache (several millions entries in my case), this is highly inefficient, as each call to expungeByName will iterate the whole cache again.

In my use case, purging a hundred entries will typically take dozens of seconds where dnsdist uses 100% CPU.