Merging indices

[karl wettin <ka...@gmail.com>]

I'm looking for what might be the best solution to allow merging of  
indices with my InstantiatedIndex. The idea is to get it working with  
the standard segment files for persistency.

I was thinking about running an FSDirectory parallel to the  
InstantiatedIndex, making sure that all changes is also done to a  
FSDirectory. Another solution would be to introduce Directory.copy 
(IndexReader) [read: Index.copy(IndexReader)] rather than  
Directory.copy(Directory), i.e. to dump snapshots of the index in  
heap to a new FSDirectory. None of these chooises sounds that  
compelling to me. Any suggestions to alternate solutions or comments  
on the one I listed would be welcome.

-- 
karl

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