Because Lucene has to first find the segment that the specified document is in, and this is done via IndexReaders, not IndexWriters.
More about this in the Lucene book. Otis --- Dror Matalon <[EMAIL PROTECTED]> wrote: > Which begs the question: why do you need to use an IndexReader rather > than an IndexWriter to delete an item? > > On Tue, Nov 11, 2003 at 02:46:37PM -0800, Otis Gospodnetic wrote: > > > 1). If I delete a term using an IndexReader, can I use an > existing > > > IndexWriter to write to the index? Or do I need to close and > reopen > > > the IndexWriter? > > > > No. You should close IndexWriter first, then open IndexReader, > then > > call delete, then close IndexReader, and then open a new > IndexWriter. > > > > > 2). Is it safe to call IndexReader.delete(term) while an > IndexWriter > > > is > > > writing? Or should I be synchronizing these two tasks so only > one > > > occurs at a time? > > > > No, it is not safe. You should close the IndexWriter, then delete > the > > document and close IndexReader, and then get a new IndexWriter and > > continue writing. > > > > Incidentally, I just wrote a section about concurrency issues and > about > > locking in Lucene for the upcoming Lucene book. > > > > Otis > > > > > > __________________________________ > > Do you Yahoo!? > > Protect your identity with Yahoo! Mail AddressGuard > > http://antispam.yahoo.com/whatsnewfree > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: > [EMAIL PROTECTED] > > > > -- > Dror Matalon > Zapatec Inc > 1700 MLK Way > Berkeley, CA 94709 > http://www.fastbuzz.com > http://www.zapatec.com > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGuard http://antispam.yahoo.com/whatsnewfree --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
