SOLR Timeout

[McBride, John]

Hello All,
 
Prior to SOLR 1.3 and nutch patch integration - what actually is  the effect of 
SOLR (non)-timeout?  Do the threads eventally die?  DOes a new request cause a 
new query thread to open, or is the system locked?
 
What causes a timeout- a complex query?
 
Is SOLR 1.2 open to DoS attacks by submitting complex queries?
 
Thanks,
John