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I don’t know what the ReaderUtil.subReader of Lucene does. Does anybody know what it does?
See the class definition here: ReaderUtil.
Is it used to read each segment separately?
A Lucene index is divided into segments. In short, from each segment only a chunk of the index is read. And subreaders are the actual readers which work directly on a segment (one segment => one segment reader). And the
IndexReader, which clients use, is an aggregated implementation that uses the subreaders to perform the actual work.