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From "Erick Erickson" <>
Subject Re: Indexing
Date Wed, 22 Aug 2007 14:12:48 GMT
There are several approaches. First, is your index small
enough to fit in RAM? You might consider just putting it all in
RAM and searching that.

A more complex solution would be to keep the increments
in a separate RAMDir AND your FSDir, search both and
keep things coordinated. Something like

open FSDIr
create RAMDir
while (whatever) {
   get request
   if (modification) {
       write to FSDir and RAMDir
   if (search) {
     search FSDir
     open RAMDir reader
     search RAMDir
     close RAMDir reader (but not writer!)

close FSDIr
close RAMDir
start again from the top.

Warning: I haven't done this, but it *should* work. The sticky
part seems to me to be coordinating deletes since the
open FSDir may contain documents also in the RAMDir,
but that's "an exercise for the reader"<G>,

You could also define the problem away and just live
with a 5 minute latency.


On 8/22/07, Jonathan Ariel <> wrote:
> Hi,
> I'm new to this list. So first of all Hello to everyone!
> So right now I have a little issue I would like to discuss with you.
> Suppose that your are in a really big application where the data in your
> database is updated really fast. I reindex lucene every 5 min but since my
> application lists everything from lucene there are like 5 minutes (in the
> worse case) where I don't see new staff.
> What do you think would be the best aproach to this problem?
> Thanks!
> Jonathan

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