Hi, In CLucene only one process can write to the index at the same time. As far as I know it is by intent. The only solution is to synchronize the write access in your apllication (eg. by boost::file_lock)
Regards Borek > -----Original Message----- > From: Adrian Jordan [mailto:adrian.jor...@iongeo.com] > Sent: Thursday, December 19, 2013 12:31 PM > To: clucene-developers@lists.sourceforge.net > Subject: [CLucene-dev] IndexWriter concurrency > > Hello, > > We are using Qt Help (version 4.7.3) to provide documentation for our > application. > > When we launch it, Qt creates an index directory based upon the Qt Help > collection file, which is used by CLucene (bundled with the Qt Help > Framework) to index the help contents. > > So we have for example: > > ../documentation/ > help.qhc > .help/ > segments > _6d.cfs > deletable > > This setup is not working in our application, which consists of > multiple processes running concurrently, as it causes one or more > processes to crash when we startup. > > >From the GDB back trace from the core file that was produced, the > CLucene code is crashing in: > > RAMDirectory::close (line 352) > files.clear(); > TransactionalRAMDirectory::close (line 209) > RAMDirectory::close(); > IndexWriter::close (line 165) > ramDirectory->close(); > > This seems to point to an issue with concurrent access to the > IndexWriter (related to SCOPED_LOCK_MUTEX? VoidMap?). I believe CLucene > uses a write lock on this directory (.help in our case) that can only > be access by one process at a time. > > We can reproduce it repeatedly be removing the files under the .help > directory and restarting our application. > > Upgrading to the latest version of CLucene didn't resolve the issue (I > can't even find out which version we are using!). > > So: > > 1/ Should CLucene support multiple processes/instances of the same > process writing to this index directory? > 2/ Is there setting we can use to try and resolve this (e.g increase > the write lock timeout)? > 3/ Is this a known issue and has it been fixed? > > I look forward to hearing from anyone with any ideas about this. > > Thanks, > > Adrian > > ________________________________ > > > This email and any files transmitted with it are confidential and are > intended solely for the use of the individual or entity to whom they > are addressed. If you are not the original recipient or the person > responsible for delivering the email to the intended recipient, be > advised that you have received this email in error, and that any use, > dissemination, forwarding, printing, or copying of this email is > strictly prohibited. If you received this email in error, please > immediately notify the sender and delete the original. > > > ----------------------------------------------------------------------- > ------- > Rapidly troubleshoot problems before they affect your business. Most IT > organizations don't have a clear picture of how application performance > affects their revenue. With AppDynamics, you get 100% visibility into > your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of > AppDynamics Pro! > http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.cl > ktrk > _______________________________________________ > CLucene-developers mailing list > CLucene-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/clucene-developers ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ CLucene-developers mailing list CLucene-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/clucene-developers
