On 10/5/09 5:30 PM, Nigel wrote:
Before Lucene 2.9, I don't think this made any difference, as (I think) the only advantage to calling reopen vs. just creating another IndexReader was having reopen figure out whether the index had actually changed. (And whave a different way to figure that out, so it was a non-issue.)
There was a big difference before too: reopen() in 2.4.x only loads internal data structures from new segments, like the terms dictionary and norms. The performance improvements were significant already (see https://issues.apache.org/jira/browse/LUCENE-743?focusedCommentId=12532585&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#action_12532585). Now in 2.9 this also works for field caches.
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