Drupal + MongoDB + ApacheSolr I'm developing a website which uses MongoDB drupal module, I also need ApacheSolr as search engine, I googled about the Compatibility of ApacheSolr and MondoDB but found nothing.
Can I use Mongo as database and ApacheSolr as search engine (with search api) together?
Given that Search API/Search API Solr use Drupal core functions for retrieving entity data in order to be database agnostic, and the MongoDB module just adds another database backend for storing items like fields, there wouldn't be a conflict. As long as you stick with Drupal core functions in your custom integration, you should be fine.