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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