As always, "it depends". You can try to reconstruct the doc from an index, see Luke. But depending upon you you indexed things, it may be more or less lossy. I remember this was discussed recently, you might have some luck if you search the archive.
But it may be very, very expensive to reconstruct all the docs from an index, see how long Luke takes to do this on your index..... If you stored all the fields in addition to indexing them, then there's no problem since the stored fields *are* what you indexed. How did you create your original index? Erick On Jan 31, 2008 12:28 PM, John Wang <[EMAIL PROTECTED]> wrote: > I have to keep one index though. Is there a way to reproduce an index from > an indexReader? > > -John > > On Jan 31, 2008 1:30 AM, Michael McCandless <[EMAIL PROTECTED]> > wrote: > > > > > Just beware, though, that with ParallelReader you must ensure that > > the internal docIDs of both indices remain "aligned" over time. > > > > If you never do deletions, then that happens for free. > > > > If you do deletions, then, you must change IndexWriter to buffer by > > doc count (same doc count for all writhers), and, you must change the > > merge policy to LogDocMergePolicy. You also might need to switch to > > SerialMergeScheduler if you ever allow readers to refresh against the > > indices while a writer is still open. If you don't do that (ie > > reader can only re-open after a writer is closed) then it's safe to > > stick with ConcurrentMergeScheduler. > > > > Mike > > > > On Jan 31, 2008, at 4:23 AM, Doron Cohen wrote: > > > > > This may help: > > > http://www.nabble.com/Updating-Lucene-Index-with-Unstored-fields- > > > tt15188818.html#a15188818 > > > > > > Doron > > > > > > On Thu, Jan 31, 2008 at 2:42 AM, John Wang <[EMAIL PROTECTED]> > > > wrote: > > > > > >> Hi all: > > >> > > >> We have a large index and it is difficult to reindex. > > >> > > >> We want to add another field to the index without reindexing, > > >> e.g. just > > >> create a new inverted index, dictionary files etc. > > >> > > >> How feasible is it to add this to lucene? > > >> > > >> > > >> Thanks > > >> > > >> -John > > >> > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > >
