Followup from SOLR-2193 - Solr is waiting for NRT support for a long time now. Mark has started a great issues on re-arch the updatehandler and its followup SOLR-2565. This issue aims to provide NRT support to solr once SOLR-2565 is resolved.
SOLR-2565 largely accomplishes this. Some problems that remain are where top level readers are still used: ord() in function queries, filtering, and some faceting.
Simon Willnauer & Mark Miller - maybe this is resolvable now?
fixed a while ago with all the solr cloud stuff together...
Closed after release.