In order to determine the integrity of an index file, I found that the easiest way was to use IndexReader.open(directory) and if there were any problems with the data then catch the exceptions and make a new one.
I also see that the API offers IndexReader.indexExists() ... would that be a better alternative? Or would I miss out on being able to check if the index is corrupt if I limit myself to that invocaction only? Thanks! - Pulkit On Tue, Sep 21, 2010 at 12:53 AM, Lance Norskog <goks...@gmail.com> wrote: > If an index file is not completely written to disk, it never become > available. Lucene has a file describing the current active index segments. > It writes all new files to the disk, and changes the description file > (segments.gen) only after that. > > If the index files are corrupted, all bets are off. Usually the data > structures are damaged and Lucene throws CorruptIndexExceptions, NPE or > array out-of-bounds exceptions. There is no checksumming of the index files. > > Lance > > Pulkit Singhal wrote: >> >> Hello Everyone, >> >> What happens if: >> a) lucene index gets written half-way to the disk and then something goes >> wrong? >> b) the index gets corrupted on the file system? >> >> When we open that directory location again using FSDirectory >> implementations: >> a) Is there any provision for the code to clean out the previous file >> and start a new index file because the older one was corrupted and >> didn't match the checksum? >> b) Or can we check that the # of documents that can be found in the >> underlying index are now ZERO because they can't be parsed properly? >> How can we do this? >> >> - Pulkit >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org >> For additional commands, e-mail: java-user-h...@lucene.apache.org >> >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > > --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
