If you use the compound index file format (the default since Lucene 1.4) you'll avoid the file descriptors issue. If you add 10 documents at one time with a single IndexWriter, you will not create 10 segments, only one segment (generally speaking, based on the default segment factors).

        Erik


On Apr 23, 2006, at 9:48 AM, John Paige wrote:

Hello all,
In my application it is required to build an index for each user. We need
to add documents to the existing index frequently.
We cannot use RAMDirectory to create a RAM index and merge it with the
FSDirectory index later on based on the mergefactor. We need to add each
document in the FSDirectory based index.
We are afraid of getting into the "out of file descriptors" issue , so my question is, does lucene create a segment for each document that gets added to the FS based index i.e. will adding 10 documents to the existing index
create 10 segments?

Thanks,
John


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