You still have a disk seek per doc if the index can't fit in memory
(usually more costly than reading the fields) .
Why not use FieldCache?
-Mike
On 2-Aug-07, at 5:41 PM, Mark Miller wrote:
If you are just retrieving your custom id and you have more stored
fields (and they are not tiny) you certainly do want to use a field
selector. I would suggest SetBasedFieldSelector.
- Mark
testn wrote:
Hi,
Why don't you consider to use FieldSelector?
LoadFirstFieldSelector has an
ability to help you load only the first field in the document without
loading all the fields. After that, you can keep the whole
document if you
like. It should help improve performance better.
is_maximum wrote:
yes it decrease the performance but the only solution.
I've spent many weeks to find best way to retrive my own IDs but
find this
way as last one
now I am storing the ids in a BitSet structure and it's fast enough
public void collect(...){
idBitSet.set(Integer.valueOf(searcher.doc(id).get("MyOwnID")));
}
On 8/2/07, makkhar <[EMAIL PROTECTED]> wrote:
Hi,
The solution you suggested will definitely work but will
definitely
slow
down my search by an order of magnitude. The problem I am trying
to solve
is
performance, thats why I need the collection of IDs and not the
whole
documents.
- thanks for the prompt reply.
is_maximum wrote:
yes if you extend your class from HitCollector and override the
collect()
mthod with following signature you can get IDs
public void collect(int id, float score)
On 8/2/07, makkhar <[EMAIL PROTECTED]> wrote:
Hi all,
Can I get just a list of document Ids given a search
criteria ? To
elaborate here is my situation:
I store 20000 contracts in the file system index each with some
parameterName and Value. Given a search criterion -
(paramValue='draft').
I
need to get just an ArrayList of Strings containing contract
Ids. I
dont
need the lucene documents, just the Ids.
Can this be done ?
-thanks
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