-----Oorspronkelijk bericht----- Van: Luke Shannon [mailto:[EMAIL PROTECTED] Verzonden: maandag 10 januari 2005 15:46 Aan: Lucene Users List Onderwerp: Re: what if the IndexReader crashes, after delete, before close.
>>One thing that will happen is the lock file >>will get left behind. This means when you start >>back up and try to create another Reader you will >>get a file lock error. I have figured out that part the hard way ;) Why can`t I access my index anymore?? Ahh.. The lock file >>Our system is threaded and synchronized. >>Thus when a Reader is being created I know >>it is the only one (the Writer comes after >>the reader has been closed). Before creating >>it I check if the Index is locked. If it is, >>I forcefully clear it. This prevents the above >>problem from happening. You can have more than 1 reader open at anytime. Even while a delete or add is in progress. But you can`t use a reader where documents are deleted (IndexReader) and added(IndexWriter) at the same time. If you don`t have other threads doing delete/add you won`t have to synchronize anything. And how do you synchronize on it? I have applied the ReadWriteLock From Doug Lea`s concurrency library after I have build my own synchronization brick and somebody pointed out that I was implementing the ReadWriteLock. But at the moment I don`t do any synchronization. And I want to have a component that is executed if the system is started and knows that to do if there is rubbish in the index directory. I want that component to restore my index to a usable version (and even small loss of information is acceptable because everything is checked once and a while. And user-added-information is going to be stored in the database. So nothing gets lost. The index can be rebuild.. Luke ----- Original Message ----- From: "Peter Veentjer - Anchor Men" <[EMAIL PROTECTED]> To: <lucene-user@jakarta.apache.org> Sent: Saturday, January 08, 2005 4:08 AM Subject: what if the IndexReader crashes, after delete, before close. What happens to the Index if the IndexReader crashes, after I have deleted documents, and before I have called close. Are the deletes ignored? Is the Index screwed up? Is the filesystem screwed up (if a document is deleted new delete-files appear) so are the delete-files still there (and can these be ignored the next time?). Can I restore the index to the previous state, just by removing those delete-files? --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
