too many open files is it a leak of handler live there?

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too many open files is it a leak of handler live there?

sunbirdjob
   
when embeded the solr in my application last night, i encountered the too many open file exception just like that said in "http://mail-archives.apache.org/mod_mbox/lucene-solr-user/200702.mbox/%3cB2D43E42-6549-46E8-80DE-902A19CEF0AC@...%3e". And i used DirectSolrConnection to integrate solr with my application.
 
 
    I debuged when solr doing search, and i found that every time solr had a query search done the refcount will increase one. I know solr use refcount to keep reasher safe close, but should it be +1 when solr doing search and -1( it is to say call decref()) after search done? or else when commit take place it just decrease the refcount by 1, and the refount still>1 and searcher not really close, which leads to the hanging of the handlers and finally the too many open files problem. Is it a bug? or i should not use the DirectSolrConnection?
 
By the way the "ulimit -n 10000" not work out in my case, it just delay the time. i use the "lsof |grep solr| wc -l" to monitor the handler, it keeps increasing, i think it is a leak of handler here.  
 
Any help would appreciated, thank you !!!