I don't think there are any problems with doing both operations at the same time.
Otis -- Sematext -- http://sematext.com/ -- Lucene - Solr - Nutch ----- Original Message ---- > From: jian chen <[EMAIL PROTECTED]> > To: java-user@lucene.apache.org > Sent: Friday, May 16, 2008 7:12:34 PM > Subject: simultaneous read and writes to the RAMDirectory > > Lucene gurus, > > I have a question regarding RAMDirectory usage. Can the IndexWriter keep > adding documents to the index meanwhile the IndexReader is open on this > RAMDirectory and searches going on? > > I know in a FSDirectory case, the IndexWriter can add documents to the index > meanwhile IndexReader reads from the index. This is because the IndexWriter > just writes new index files rather than modifying existing index files. The > only place (I remember) that the new and old indexes will conflict is the > segment file. Again, once the IndexWriter commits the change (by calling > close() method), the segment.new is renamed to segment atomically. Since the > old segment file is cached in memory by the IndexReader, so not a problem > for the IndexReader to serve search requests. The old segment file is cached > in memory, the other files pointed to by the old segment file are cached by > Linux anyway, or not removed by windows due to still being used. > > Anyway, back to the RAMDirectory case. Having an IndexReader open while > IndexWriter adding documents to it, will that cause any issue? > > Thanks, > > Jian --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
