> Even with you code changes, to see the modification made using the > IndexWriter, it must be closed, and a new IndexReader opened.
That behaviour remains the same. > So a far simpler way is to get the collection of updates first, then > using opened indexreader, > for each doc in collection > delete document using "key" > endfor > open indexwriter > for each doc in collection > add document > endfor > open indexreader So, you are buffering the updates into large batches. This patch improves performance for small batches. There are several advantages in supporting deletes in IndexWriter: 1 Applications don't have to worry about how each of them should buffer inserts/deletes into large batches. IndexWriter takes care of that. 2 deleteDocuments(Term)/batchDeleteDocuments(Terms[]) supported by IndexWriter will be as general as deleteDocuments(Term) supported by IndexReader. No concept of a "key" is necessary. 3 If an application reopens the index after your batched deletes but before your batched inserts, some previously available documents will "disappear" (see http://www.gossamer-threads.com/lists/lucene/java-dev/23045?nohighlight=1#23045). Supporting deletes in IndexWriter will eliminate this problem. 4 When IndexWriter supports deletes, a concurrent merge thread is possible and makes sense. A concurrent merge thread means having a separate thread dedicated to merging segments. Today, when a merge of large segments (or a cascade of merges) is started, no documents can be inserted before the merge(s) finish(es). A concurrent merge thread will eliminate this problem. In addition, on a machine with sufficient CPU resources, this will improve the insert/delete performance not only for small insert/delete batches, but also for large batches. I have coded this and experiments have verified the claims. I will make it available if people are interested. Regards, Ning --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
