thanks for your quick reply.
I'm trying to use your method, but running into a NullPointerException on
the IndexWriteer.addIndexes().
code sample
isearcher is IndexSearcher,
newValues is IndexWriter with RAM Directory
ParallelReader preader = new ParallelReader();
preader.add(isearcher.getIndexReader());
preader.add(new
IndexSearcher(newValues.getDirectory()).getIndexReader());
int numdoc = preader.numDocs();
for (int i = 0; i< numdoc; i++){
Document d= preader.document(i);
System.out.println( d.toString());
}
writer.addIndexes(new IndexReader[]{preader});
this code works fine before the addIndexes line.
it printed the merged index properly.
but addIndexes throws NullPointerException.
java.lang.NullPointerException
at
org.apache.lucene.index.ParallelReader$ParallelTermPositions.seek(ParallelReader.java:358)
at
org.apache.lucene.index.ParallelReader$ParallelTermDocs.seek(ParallelReader.java:320)
at
org.apache.lucene.index.SegmentMerger.appendPostings(SegmentMerger.java:327)
at
org.apache.lucene.index.SegmentMerger.mergeTermInfo(SegmentMerger.java:298)
at
org.apache.lucene.index.SegmentMerger.mergeTermInfos(SegmentMerger.java:272)
at
org.apache.lucene.index.SegmentMerger.mergeTerms(SegmentMerger.java:236)
at
org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:89)
at
org.apache.lucene.index.IndexWriter.addIndexes(IndexWriter.java:605)
I was using lucene 1.9.1, but there's a bug for this ,and i've updated to
lucene 2.0.0,
but still the same.
thanks in advance,
Philip
Andrzej Bialecki wrote:
>
> philipc wrote:
>> hi,
>>
>> I'm trying to add a new field to all the documents in a lucene index.
>> After searching around, I found the only way to do an update
>> is by retrieve the old documents, update it, delete it, then re-add
>> to index.
>>
>> However, this worked for only preserving the stored fields.
>> i've lost all the unstored fields from the documents.
>> is there anyway to keep the unstored fields as well?
>>
>> Or any way to go around the problem,
>> ie, anyway to export the entire index to a csv file
>> and then update the cvs, and then import it back?
>
> Here's an idea: create an index consisting of documents with just this
> field, adding documents in exactly the same order as they are in the
> other index. Then use ParallelReader to access both indexes at the same
> time - ParallelReader will present a merged view of both indexes. You
> can also use IndexWriter.addIndexes() to create a merged index.
>
>
> --
> Best regards,
> Andrzej Bialecki <><
> ___. ___ ___ ___ _ _ __
> [__ || __|__/|__||\/| Information Retrieval, Semantic Web
> ___|||__|| \| || | Embedded Unix, System Integration
> http://www.sigram.com Contact: info at sigram dot com
>
>
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