There are some settings which are common to apply to the JVM. You might try those first. If you do a search for JVM java DNS settings it will come up.
On Wed, Mar 22, 2023 at 7:01 AM Tim Funk <[email protected]> wrote: > I ran into an interesting situation today with respect to latency due to > failed DNS lookups. > > THE SETUP > Using RHEL8, openjdk 11, solr 9.1.1. The solr instance was standalone in a > mostly out of the box config. (No SSL, only http) > > I had 3 entries in /etc/resolv.conf and the first one in the list was > "broken". It was timing out on requests. > > The situation - When I would issue a query - I'd have upwards of a 5 second > pause prior to completion of the request. Which feels like a timeout being > hit. For example, while on the server "10.0.0.200" > curl -v ' > http://10.0.0.200:8983/solr/mycore/select?q=*:*&fq=locale_s:en-us&rows=1' > > I then edited jetty.xml to > remove "org.eclipse.jetty.server.handler.InetAccessHandler" (since I wasn't > using an ACL anyways). From there - results seemed to get a little better. > I tended to get instant responses, but occasionally, I'd still see the > multi-second delay. > > I'm not sure how to track down this second piece of latency when DNS fails. > Is this an opportunity to also remove these lookups to improve performance? > > > -Tim >
