> From: Kelvin Tan [mailto:[EMAIL PROTECTED]] > > True (and it's great) that once an IndexReader is open, no > actions on the IndexWriter affect it. > > However, if an IndexReader is opened _after_ indexing begins, > I suppose it'll throw an exception? Doesn't it mean that when > indexing is taking place, the search engine is effectively down...
No, an index is always searchable. It should be possible to open an IndexReader at any time, and a coherent version of the index will be available for search. > I suppose then, that if I still want to have the search > engine up whilst indexing (where indexing takes a non-trivial > amount of time), I'll have to index to a temporary location, > then copy the index files over? No, that is not required. > Alternatively, I guess it's > possible to open an IndexReader _before_ commencement of > indexing and provide this instance of IndexReader to clients > who need to search? This can be a useful technique if you are performing a number of coordinated deletions and insertions to an index, and wish them all to appear at once. Doug -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
