Intermittent long pauses when running as server

[timhaak]

When under high load, the server pauses for a couple of seconds now and again.

I've tried to work out what could have caused this.

But at my wits end to find this.

Has someone else seen something similar?

[ArjixWasTaken]

When under high load, the server pauses for a couple of seconds now and again.

you most likely encountered javascript's garbage collector

[timhaak]

Hmm I tested changing the settings related to this.

I eventually tracked it down to a specific DNS request that was causing the problem though not to why.

Assuming it was broken in some way. If the clients who were sending that were blocked the pause never occurred.

Stopped debugging as moved over to using Coredns which is currently working really well for us.

[ArjixWasTaken]

sadly coredns doesn't seem to cover my needs 😔
I am stuck maintaining another library for dns packets

[timhaak]

What are you needs?

[ArjixWasTaken]

Contacting a mongo database, storing cache in redis/memcached and contacting some REST APIs for each dns request.
Sounds too complex to make as a coredns plugin.

[ArjixWasTaken]

Don't worry though, the dns server is already written and has been working for like a decade now.
I am just trying to refactor my predecessors' code and maybe switch libraries.

[timhaak]

:) Cool understand

The above should be very doable via a plugin, as I'm doing something of a similar level of complexity.

The migration over was as simple as all the logic, which had been sorted in the node code, being far simpler to iterate.

Having said that, if we didn't have the bug, I also wouldn't have done the rewrite :)