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From Kay Kay <>
Subject Multiple IndexReaders from the same Index Directory - issues with Locks / performance
Date Mon, 22 Dec 2008 22:34:50 GMT
For one of our projects - we were planning to have the system of 
multiple individual Lucene readers (just read-only instances and no 
writes whatsoever ) in different physical machines having their 
IndexReader-s warmed up from the same directory for the indices and 
working on the same. 

I was reading about locks (implemented as files) that Lucene uses 
internally. I am just curious if using multiple readers would be a 
feasible option here, all sharing the same index directory (across NFS / 
similar network mounted storage ) in terms of locking etc.

Would there be a performance hit ( ignoring the NFS related performance 
of course)  that would hinder multiple readers to serve query search 
simultaneously from the same set of index files.

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