Dear Michael, Thanks so much for your help! I will try your solution and let you know if it works fine.
Best, LB On Fri, Oct 30, 2009 at 11:05 AM, Michael Garski <mgar...@myspace-inc.com> wrote: > You won't need to synchronize the writers yourself as there are locks > internally, but I would avoid multiple threads sharing a writer for > performance reasons. > > Michael > > -----Original Message----- > From: Li Bing [mailto:lbl...@gmail.com] > Sent: Thursday, October 29, 2009 8:02 PM > To: Michael Garski > Cc: lucene-net-user@incubator.apache.org > Subject: Re: Exceptions When Indexing with Multi-threading > > Dear Michael, > > Yes, each thread in my system has its own IndexWriter. But all of them > are synchronized by a unique lock. So I think the exception should not > occur, right? If the threads share a single IndexWriter, what about > the performance? I don't need to synchronize by myself if so, right? > > I appreciate so much for your help! > > LB > > On Fri, Oct 30, 2009 at 12:33 AM, Michael Garski > <mgar...@myspace-inc.com> wrote: >> Does each thread have its own IndexWriter? This could cause the issue >> you describe. >> >> IndexWriter is thread-safe so that multiple threads can use the same >> instance, however you will see a performance degradation compared to >> only having one thread modify the index. We've done quite a bit of >> testing for that case a while back and only have one thread modifying an >> index at a time. >> >> Michael >> >> -----Original Message----- >> From: Li Bing [mailto:lbl...@gmail.com] >> Sent: Wednesday, October 28, 2009 10:57 PM >> To: lucene-net-user@incubator.apache.org >> Cc: Li Bing - Gmail >> Subject: Exceptions When Indexing with Multi-threading >> >> Dear all, >> >> Today I got exceptions when indexing with multi-threading. It says >> that "deletable.new" or "segments.new" are accessed by other >> processes. So it cannot rename ... >> >> However, I have used "ReaderWriterSlim" lock to avoid the relevant >> folders to be accessed by multiple threads at the same time. For >> example, if the indexing is done in D:\Test\, I use "ReaderWriterSlim" >> to prevent other threads from writing in the folder. I think the above >> exceptions should not happen if I do that. However, it is NOT true. >> Why? >> >> Any other ways to avoid the problem? >> >> Thanks so much! >> LB >> >> >> > > >
