So here's a modified sequence of operations, perhaps a bit more efficient than proposed by Christoph:
1) Open an IndexReader for searching - S. Keep it open until the transaction is committed.
2) Open a second IndexReader for deletions - D.
3) Create a filter bitset F (or use any other mechanism for storing document numbers to be deleted)
4) Open an IndexWriter for new documents - W.
5) As documents come in, add them using W. Find their old versions in D and record their document numbers in F. D will not show any new documents, only documents present at the time D was created.
6) Close W.
7) Use D to delete all documents marked in F.
8) Close D.
What happens if there are deletions in S and D, and then, in step 5, as documents are added to W and segments are merged, documents are renumbered? Wouldn't that invalidate F? Currently we don't permit one to delete documents from an IndexReader while an IndexWriter is open, to prevent this sort of thing. Am I missing something?
Doug
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