Re: Lucene index files from two different applications.
Gururaja H wrote: Hi ! Have two applications. Both are supposed to write Lucene index files and the WebApplication is supposed to read these index files. Here are the questions: 1. Can two applications write index files, in the same directory, at the same time ? if you implement the synchronisation between these 2 applications, yes 2. If two applications cannot write index files, in the same directory, at the same time. How should we resolve this ? Would appriciate any solutions to this... ... se 1. and 3. 3. My thought is to write the index files in two different directories and read both the indexes (as though it forms a single index, search results should consider the documents in both the indexes) from the WebApplication. How to go about implementing this, using Lucene API ? Need inputs on which of the Lucene API's to use ? If yor requirements allow you to create to independent indices, than you can use the MultiSearcher to search in both indices. Maybe this will be the most cost effective solution in your case, Best, Sergiu Thanks, Gururaja __ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Lucene index files from two different applications.
On Dec 21, 2004, at 5:51 AM, Gururaja H wrote: 1. Can two applications write index files, in the same directory, at the same time ? If you mean to the same Lucene index, the answer is no. Only a single IndexWriter instance may be writing to an index at one time. 2. If two applications cannot write index files, in the same directory, at the same time. How should we resolve this ? Would appriciate any solutions to this... You may consider writing a queuing system so that two applications queue up a document to index, and a single indexer application reads from the queue. Or the applications could wait until the index is available for writing. Or... 3. My thought is to write the index files in two different directories and read both the indexes (as though it forms a single index, search results should consider the documents in both the indexes) from the WebApplication. How to go about implementing this, using Lucene API ? Need inputs on which of the Lucene API's to use ? Lucene can easily search from multiple indexes using MultiSearcher. This merges the results together as you'd expect. Erik - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Lucene index files from two different applications.
Depending on what you are doing, there are some problems with MultiSearcher. See http://issues.apache.org/bugzilla/show_bug.cgi?id=31841 for a description of the issues and possible patch(es) to fix. Chuck -Original Message- From: Erik Hatcher [mailto:[EMAIL PROTECTED] Sent: Tuesday, December 21, 2004 3:09 AM To: Lucene Users List Subject: Re: Lucene index files from two different applications. On Dec 21, 2004, at 5:51 AM, Gururaja H wrote: 1. Can two applications write index files, in the same directory, at the same time ? If you mean to the same Lucene index, the answer is no. Only a single IndexWriter instance may be writing to an index at one time. 2. If two applications cannot write index files, in the same directory, at the same time. How should we resolve this ? Would appriciate any solutions to this... You may consider writing a queuing system so that two applications queue up a document to index, and a single indexer application reads from the queue. Or the applications could wait until the index is available for writing. Or... 3. My thought is to write the index files in two different directories and read both the indexes (as though it forms a single index, search results should consider the documents in both the indexes) from the WebApplication. How to go about implementing this, using Lucene API ? Need inputs on which of the Lucene API's to use ? Lucene can easily search from multiple indexes using MultiSearcher. This merges the results together as you'd expect. Erik - 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]
