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From Britske <gbr...@gmail.com>
Subject Re: addIndexesNoOptimize on shards --> is docid deterministic and calculable? (IF docids of shards seperately are known)
Date Wed, 04 Nov 2009 14:34:28 GMT

Just to clarify question changed the subject: 
addIndexesNoOptimize on shards --> is docid deterministic and calculable?
(IF docids of shards seperately are known) 


Britske wrote:
> 
> Hi, 
> 
> say I have: 
> - Indexreader[] readers = {reader1, reader2, reader3} //containing all
> different docs
> - I know the internal docids of documents in reader1, reader2, reader3
> seperately
> 
> Does doing IndexWriter.addIndexesNoOptimize(Indexreader[] readers) on
> these readers give me a determinstic and calculable set of docids on the
> documents in the resulting documentWriter? 
> 
> i.e: from http://lucene.apache.org/java/2_4_1/fileformats.html: 
> "The numbers stored in each segment are unique only within the segment,
> and must be converted before they can be used in a larger context. The
> standard technique is to allocate each segment a range of values, based on
> the range of numbers used in that segment. To convert a document number
> from a segment to an external value, the segment's base document number is
> added."
> 
> Does assinging docids in addIndexesNoOptimize work like this? 
> in other words: 
> - docids of docs in reader1 stay the same in indexwriter
> - docids of docs in reader2 are incremented by reader1.docs.size();
> - docids of docs in reader3 are incremented by reader1.docs.size() +
> reader2.docs.size()
> 
> Thanks, 
> Geert-Jan
> 

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