How to Cache Filter Results between Servers

[Sariny]

hello everyone

            I have this test code:

                IndexReader ir = getReader(); 
        TermQuery q = new TermQuery(new 
Term("sub_id",NumericUtils.intToPrefixCoded(57)));
        
        Filter f = new QueryWrapperFilter(q);
        try
        {
            DocIdSet s = f.getDocIdSet(ir);

            DocIdSetIterator i = s.iterator();
            while(i.nextDoc() != DocIdSetIterator.NO_MORE_DOCS)
            {
                System.out.println(i.docID());
            }

            System.out.println(f.hashCode());
            System.out.println(s.hashCode());
            System.out.println(ir.hashCode());
            System.out.println(ir.getFieldCacheKey().hashCode());
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }


       1. getReader() returns a MultiReader may consist of  several 
IndexReaders, in my test case ,only consist of one IndexReader
           2. index files won't change 

          assuming that index files won't be updated, and my question is : 
                
          1. why ir.hashCode() returns different value every time I run this 
code?
      2. if I copy the index file to another server ,and they provide search 
service together,will f.getDocIdSet(ir) return the same DocIdSet? if true,how 
to cache filter results and share between the 2 servers?  how to form a cache 
key not influenced by question 1?



          Thanks ~~

                                                                                
                                                                                
               



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