Multisearcher after performing search on second index, adds the resultant
docid with the maxdocid of the first index. In my case it would be 3. After
incrementing the docid, the document is inserted in to the
FieldDocSortedHitQueue. FieldDocSortedHitQueue is an extension of priority
queue should sort in the increasing order. It should insert docid 3 after 2
and not after 0.
code snippet of MultiSearcher.Java
--------------------------------------
if (hq == null) hq = new FieldDocSortedHitQueue (docs.fields, n);
.....
for (int j = 0; j < scoreDocs.length; j++) { // merge scoreDocs into hq
ScoreDoc scoreDoc = scoreDocs[j];
scoreDoc.doc += starts[i]; //Doc id is
incremented*******
if (!hq.insert (scoreDoc)) //Insertion should do
automatic sorting
break; }
Regards
Ganesh
----- Original Message -----
From: "Hadi Forghani" <[EMAIL PROTECTED]>
To: <java-user@lucene.apache.org>
Sent: Thursday, October 23, 2008 3:25 PM
Subject: Re: Multisearcher will maintain index order sorting?
because when you want to find X of second index, shoud pass docId=3 to
MultiSearcher and MultiSearcher can Find Sub Search of this Document with
calculation length of all subSearcher.
for example when you get doc with DocID 3(Second X), multisearch (see the
code of multisearcher doc(int i)), mines 3 from your DocID(because the
first
Searcher has 3 documents) and then pass zero to second Searcher and want
to
return 0 doc from it.
on the other hand, multisearcher find subsearcher by BinarySearchTree no
just that is said.
On Thu, Oct 23, 2008 at 12:47 PM, Ganesh <[EMAIL PROTECTED]> wrote:
In IndexA there are 3 docs
DocID, Terms
0,X
1,X Y
2,X Z
In IndexB there are 3 docs
DocID, Terms
0,X
1,X Y
2,X Z
When i do sort on indexed order using Multisearcher and
ParallelMultiSearcher, it returns the result
0,X
3,X
1,X Y
4,X Y
2,X Z
5,X Z
But it should be in the order of 0,1,2,3,4,5. Could anyone explain why?
Regards
Ganesh
----- Original Message ----- From: "Ganesh" <[EMAIL PROTECTED]>
To: <java-user@lucene.apache.org>
Sent: Thursday, October 23, 2008 1:37 PM
Subject: Re: Multisearcher will maintain index order sorting?
Multisearcher and ParallelMultiSearcher, when requested to sort on doc
(indexed order), it merges the result by docID of each DB.
Regards
Ganesh
----- Original Message ----- From: "Paul Smith" <[EMAIL PROTECTED]>
To: <java-user@lucene.apache.org>
Sent: Thursday, October 23, 2008 10:57 AM
Subject: Re: Multisearcher will maintain index order sorting?
On 23/10/2008, at 4:20 PM, Ganesh wrote:
My Index DB is having 10 million records and it will grow to 30
million.
Currently I am using millisecond timestamp and the RAM cosumption is
more. I
will change the resolution to minute. I am using 2 searcher objects
refreshing each other every minute. When i do a warmup query with
sort of
timestamp then the cpu is spiked to 100% and this is happening for
every
minute. In order to avoid these issues, i am planning to break my DB
and
to do sort on indexed order.
Will multisearcher will maintain indexed order on sorting?
If you need to keep the millisecond accuracy, break down the timestamp
into 3 fields: day, time, millisecond, and sort on 3 fields. This way
each
field has a much smaller number of distinct values and well occupy
vastly
less memory over time. I don't think there's much overhead in this
approach either, because in most cases, the top-level field (day) will
provide most of the sorting ability, and Lucene will only need to hit
the
time & millisecond fields less frequently for comparison.
I believe Multisearcher does a merge sort of the 2 (or more) sub-
searchers, so there is an overhead in using in versus a single
searcher.
Paul
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