: I recently upgraded solr from 3.6.1 to 4.3, it works well, but I noticed that after finishing : indexing : : write.lock : : is NOT removed. Later if I index again it still works OK. Only after I shutdown Tomcat : then write.lock is removed. This behavior caused some problem like I could not use luke : to observe indexed data.
IIRC, This was an intentional change. In older versions of Solr the IndexWRiter was only opened if/when updates needed to be made, but that made it impossible to safely take advantage of some internal optimizations related to NRT IndexReader reloading, so the logic was modified to always keep the IndexWriter open as lon as the SolrCore is loaded. In general, your past behavior of pointing luke at a live solr index could have also produced problems if updates came into solr while luke had the write lock active. -Hoss
