: Yes, updating to a newer version of nightly Solr build could solve the : problem, but I am a little afraid to do it since solr-trunk has switched to : lucene 2.4-dev.
but did you check wether or not you have maxPendingDeletes configured as yonik asked? That would explain exactly waht you are seeing ... after a certain number of deletes have passed, the next one would automaticly force a commit (and a newSearcher) and (i believe) subsequent deletes would block until the commit is done ... which sounds like exactly what you describe. -Hoss