Solr cannot write to config directory.switching to in memory storage instead

Question

I am trying to create a solr core using this api

http://localhost:8983/solr/admin/cores?action=CREATE&name=super&instanceDir=/home/ubuntu/solr-8.8.2/server/solr/super&configSet=stored_false

the core is created fine but i got this warning

Can any one explain me this and how to solve this warning.And what effects it show on searching and indexing.

Answer 1

There are two potential explanations, but both start by checking whether that conf directory actually exists.

The first one is to properly check the permissions, as mentioned by MatsLindh.

The other is to check if your custom configset (stored_false) contains its configuration files straight under the directory, rather than under conf subdirectory like the default configsets do.

Solr accepts both directory layouts, but at least sometimes (always? recently? docker-only?), the flat layout will create the core fine but will not be able to do subsequent things with it. Fixing your configset to include conf subdirectory and moving files there solves the problem.