potential synchronization problem
Hi I forsee the following scenario in my project and hope to get a reply to this before I start coding : I have an standalone application which runs lucene indexing in the background at a user specified interval (e.g. every 2 days). In the meantime, user will be able to force a indexing operation anytime he wish to. I assume this will cause two process of lucene writing to the same index files (one from the background lucene and the other one by the user). Will this cause any problem with regards to race condition or synchronization issues if any? Thanks Sebastian Ho BII - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Problems From the Word Go
Hi Alex, I just installed Lucene one week ago on a W2K box and it took me some time to get it running. But now Lucene is fully integrated in our intranet. I index and search with Lucene our menu, all documents and the user profiles and display them according to user's access rights. By habit I always try to compile the sources of such 'external modules' inside our projects in order to see at once whether things are incompatible or missing. Lucene did actually compile very well as Lucene is not depending on any other modules. At runtime, however, I always got ClassNotFound exceptions for classes which have been compiled and which existed at the needed locations. This is really strange. I've first upgraded to 1.4.2 and installed then the Enterprise Edition. I tried many other things, but the only way to get things working was listing the JARs in the compile class path in my IDE (for yours the inclusion in the environment classpath may work) and the listing of the same JARs in the runtime class path of my application server. This way things worked fine. I had more trouble getting PDFbox to run in order to index PDFs as it would never compile as pdfbox was depending on ant, ant on bsf, and so on. In order to get that running I just placed the following JARs in my IDE's compile classpath and run the program. IDE: lucene-1.3-final.jar;lucene-demos-1.3-final.jar;pdfbox-0.6.5.jar At runtime I was required to place some more JARs in the runtime classpath of the application server: Appserv: lucene-1.3-final.jar;lucene-demos-1.3-final.jar;PDFBox-0.6.5.jar;log4j-1.2.8.jar If you need to run Ant, then just add the Ant JAR in your classpathes and go ahead! You'll then see at compile and run time which classes are still needed and then it's up to you to find and download them. Let me know if this helps you advance in the matter. At the beginning it was a bit hard to get started, but once the demo is running one progresses really fast. Lucene is really great! -Marten Alex Wybraniec [EMAIL PROTECTED]To: [EMAIL PROTECTED] utions.netcc: Subject: Problems From the Word Go 2004-04-29 17:53 Please respond to Lucene Users List I'm sorry if this is not the correct place to post this, but I'm very confused, and getting towards the end of my tether. I need to install/compile and run Lucene on a Windows XP Pro based machine, running J2SE 1.4.2, with ANT. I downloaded both the source code and the pre-compile versions, and as yet have not been able to get either running. I've been through the documentation, and still I can find little to help me set it up properly. All I want to do (to start with) is compile and run the demo version. I'm sorry to ask such a newbie question, but I'm really stuck. So if anyone can point me to an idiots guide, or offer me some help, I would be most grateful. Once I get past this stage, I'll have all sorts of juicer questions for you, but at the minute, I can't even get past stage 1 Thank you in advance Alex --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.672 / Virus Database: 434 - Release Date: 28/04/2004 - 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]
Re: potential synchronization problem
Yes. I suggest you devise a 'index request queue' mechanism to handle situations like this. This can probably be made quite generic (i.e. not Lucene and not indexing specific). How you go about implementing this is up to. Otis --- Sebastian Ho [EMAIL PROTECTED] wrote: Hi I forsee the following scenario in my project and hope to get a reply to this before I start coding : I have an standalone application which runs lucene indexing in the background at a user specified interval (e.g. every 2 days). In the meantime, user will be able to force a indexing operation anytime he wish to. I assume this will cause two process of lucene writing to the same index files (one from the background lucene and the other one by the user). Will this cause any problem with regards to race condition or synchronization issues if any? Thanks Sebastian Ho BII - 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]
Re: read only file system
If you have a very recent Lucene, then you can disable locks with command line parameters. I believe a page describing various command line parameters is on Lucene's Wiki. Otis --- Supun Edirisinghe [EMAIL PROTECTED] wrote: I think I'm alittle confused on how and index is put into use on a readonly file system I'm using Lucene in my web application. Our indexes are built off our database nightly and copied into our web app servers. I think our web app dies from time to time and sometimes a lock is left behind from Lucene in /tmp/. I have read that there is a disableLuceneLocks System Property(is that the full name or is it something like org.apache.jakarta...disableLuceneLocks?). But, I'm still not sure how I can set that. Do I give it as commandline arg to the java VM? thanks - 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]
Re: [Lucene] XML Indexing
On Apr 29, 2004, at 11:29 PM, Samuel Tang wrote: I've fixed the problem by myself. Thank you. What was the solution? Choosing a different analyzer? I've recently been doing some work on Chinese analysis: http://www.blogscene.org/erik/LuceneInAction/i18n.html But not within the context of XML. There are obviously many variables in the equation (XML file encoding, the analyzer, and more). Erik Samuel Tang [EMAIL PROTECTED] wrote:Any comments and suggestions. Please help! Note: forwarded message attached. ... http://ringtone.yahoo.com.hk/ ATTACHMENT part 2 message/rfc822 : Wed, 28 Apr 2004 23:39:30 +0800 (CST) : Samuel Tang : [Lucene] XML Indexing : [EMAIL PROTECTED] XMLIndexingDemo seems not able to index traditional Chinese characters. I can only search for English text and not Chinese. In fact, my XML document contains both Chinese and English text. How can I fix this problem? Is it necessary for me to convert the Chinese characters in BIG5 to UTF-8 before doing the file indexing? If it is, then how can we do it? This problem won't happen on indexing bilingual HTML files (Chinese English) with Lucene Demo HTML parser. ... http://ringtone.yahoo.com.hk/ - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] ... http://ringtone.yahoo.com.hk/ - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Problems From the Word Go
Unfortunately the demo that comes with Lucene is harder to run than it really should be. My suggestion is to just get the Lucene JAR, and try out examples from the many articles available. My intro Lucene article at java.net should be easy to get up and running in only a few minutes of having the JAR (and basic Java know-how with classpath and such). Erik On Apr 29, 2004, at 11:53 AM, Alex Wybraniec wrote: I'm sorry if this is not the correct place to post this, but I'm very confused, and getting towards the end of my tether. I need to install/compile and run Lucene on a Windows XP Pro based machine, running J2SE 1.4.2, with ANT. I downloaded both the source code and the pre-compile versions, and as yet have not been able to get either running. I've been through the documentation, and still I can find little to help me set it up properly. All I want to do (to start with) is compile and run the demo version. I'm sorry to ask such a newbie question, but I'm really stuck. So if anyone can point me to an idiots guide, or offer me some help, I would be most grateful. Once I get past this stage, I'll have all sorts of juicer questions for you, but at the minute, I can't even get past stage 1 Thank you in advance Alex --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.672 / Virus Database: 434 - Release Date: 28/04/2004 - 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]
Re: Problems From the Word Go
Erik, Maybe you could donate some of those demo modules (and the accompanying article/text) to Lucene, so they'd be incorporated officially in the website? Regards, Terry - Original Message - From: Erik Hatcher [EMAIL PROTECTED] To: Lucene Users List [EMAIL PROTECTED] Sent: Friday, April 30, 2004 8:48 AM Subject: Re: Problems From the Word Go Unfortunately the demo that comes with Lucene is harder to run than it really should be. My suggestion is to just get the Lucene JAR, and try out examples from the many articles available. My intro Lucene article at java.net should be easy to get up and running in only a few minutes of having the JAR (and basic Java know-how with classpath and such). Erik On Apr 29, 2004, at 11:53 AM, Alex Wybraniec wrote: I'm sorry if this is not the correct place to post this, but I'm very confused, and getting towards the end of my tether. I need to install/compile and run Lucene on a Windows XP Pro based machine, running J2SE 1.4.2, with ANT. I downloaded both the source code and the pre-compile versions, and as yet have not been able to get either running. I've been through the documentation, and still I can find little to help me set it up properly. All I want to do (to start with) is compile and run the demo version. I'm sorry to ask such a newbie question, but I'm really stuck. So if anyone can point me to an idiots guide, or offer me some help, I would be most grateful. Once I get past this stage, I'll have all sorts of juicer questions for you, but at the minute, I can't even get past stage 1 Thank you in advance Alex --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.672 / Virus Database: 434 - Release Date: 28/04/2004 - 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]
Re: Problems From the Word Go
On Apr 30, 2004, at 8:52 AM, Terry Steichen wrote: Erik, Maybe you could donate some of those demo modules (and the accompanying article/text) to Lucene, so they'd be incorporated officially in the website? Sure... and in fact that has been my intention all along. One idea that I had with the Lucene book effort was to build a complete Searchblox-like (no offense guys!) application that could be used as a real intranet search system. It has turned out that this was too bold of an idea to develop for the book because it is marginally useful in the context of book examples since it would not be able to demonstrate all the various bells and whistles without being contrived. I have no problem with any code I've done for the articles or the book becoming part of Lucene as examples. It will be a couple of months before my plate is clear enough to package it up nicely enough though, so for now the articles will have to suffice. Rest assured, though, that my intention is to eventually flesh out a really nice example web application that is easily usable. The current example app is usable now, it just takes jumping through some odd hoops to get running unfortunately. By the way, my JavaDevWithAnt project has been freely available for quite some time now, and in its current for it is an easy-to-build web app that searches a Lucene index of a snapshot of Ant's documentation (the HTML files). You can grab it here: http://www.ehatchersolutions.com/JavaDevWithAnt Eventually I'll beef that application up with new Ant 1.6 best practices and replace Struts with Tapestry. Erik - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Understanding Boolean Queries
FWIW, I'll relate a general note from my brief experience. I try to structure the index to avoid the need for boolean queries as much as possible, in order to avoid issues like yours. For example, I was indexing dozens of columns from a database table. Each database row was a document, each column a field. In order to query all these fields, I had to construct huge boolean queries (via MultiFieldQueryParser). It was too slow. After browsing some of mail archives, i realized the proper way to do this was combine all the columns into one field, and then add a second stored field with the name of the column. Now I had only one searchable field, and the queries sped up dramatically. Tate Avery [EMAIL PROTECTED] 04/29/04 12:12PM Hello, I have been reviewing some of the code related to boolean queries and I wanted to see if my understanding is approximately correct regarding how they are handled and, more importantly, the limitations. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Count for a keyword occurance in a file
I had the same need recently. Specifically, I wanted the ability to display along with the results something like: - The query jra occurred 1000 times in 600 documents. For simple queries, the IndexReader.docFreq(Term) and IndexReader.termDocs(Term) methods are the way to go. But for like phrases: - The query juvenile arthritis occurred 100 times in 20 documents. and wildcard queries (rheum*): - The query rheumatology occurred 10 times in 5 documents. - The query rheumatoid occurred 10 times in 5 documents. - The query rheumatic occurred 10 times in 5 documents. I had to do quite a bit more. I ended up modifying all of the Query classes and writing a Frequencies class. If y ou're interested, mail me directly. BTW, I joined the list only recently. Lucene is GREAT! Ype Kingma [EMAIL PROTECTED] 04/29/04 02:56AM On Thursday 29 April 2004 08:14, Nader S. Henein wrote: Tricky, scoring has to do with the frequency of the occurrence of the word as opposed to the amount of words in the file in general (Somebody correct me if I'm wrong) , so short of an educated approximation, you could hack Lucene uses two frequencies for a term: the nr. of docs in which it occurs in an index (basis for IDF), and the nr of times a term occurs in a document. the indexer to dynamically store the frequency of a word (oh so unadvisable). Personally I recommend the educated approximation, because you could index the document with the number of words in it ( you would have to make sure you're not using Stop Word Analyzer or Port Stemmer) and then based on the score reverse engineer the result you want. Nader Henein -Original Message- From: hemal bhatt [mailto:[EMAIL PROTECTED] Sent: Wednesday, April 28, 2004 5:50 PM To: Lucene Users List Subject: Count for a keyword occurance in a file Hi, How can I get a count of the score given by Hits.Score(). i.e I want to know how many times a keyword occurs in a file. Any help on this would be appreciated. The easiest way is to use IndexReader. I don't know what you mean by file (index or document), but you can have both frequencies I mentioned above from an IndexReader, evt. using skipTo() to go to the document. The methods are docFreq(Term) and termDocs(Term). Regards, Ype - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Zilverline webapplication
All, For those that are interested, I've created a web application based on lucene that's ready to roll, and can be simply dropped in a Servlet Engine. It runs out of the box, doing PDF, WORD, HTML. TXT, and can (on WIndows for now) index zip, rart, and CHM. I've just put up a website for it, and will issue the src as GPL soon later, if people are interested. Please take look at zilverline.org, and have a swing at the war. cheers, Michael Franken - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Which Field contained the hit?
Hi, I've an Index, which contains documents with muliple fields. I'm searching in several fieds. If I find a document matching my search criteria, is it possible to determine which Filed(s) contained the matching values? Those fields includes large documents, so not all of them is stored in the Index. Thanks in advance, Botond. This message was sent using IMP, the Internet Messaging Program. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Which Field contained the hit?
Have a look at IndexSearcher.explain and see if that gives you the info you want. Also, the Highlighter code may be able to help here as well (it is in the sandbox). Erik On Apr 30, 2004, at 11:06 AM, Szakács Botond wrote: Hi, I've an Index, which contains documents with muliple fields. I'm searching in several fieds. If I find a document matching my search criteria, is it possible to determine which Filed(s) contained the matching values? Those fields includes large documents, so not all of them is stored in the Index. Thanks in advance, Botond. This message was sent using IMP, the Internet Messaging Program. - 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]
RE: read only file system
I hate to speak after Otis, but the way we deal with this is by clearing
locks on server restart, in case a server crash occurs mid indexing and we
also optimize on server restart, it doesn't happen often (God bless Resin)
but when it has we faced no problems from Lucene.
Just fir the record we have a validate function that the LuceneInit calls it
looks something like this:
try {
Directory directory =
FSDirectory.getDirectory(indexPath,false);
if ( directory.list().length == 0 ) clear() ;
Lock writeLock = directory.makeLock(writeFileName);
if (!writeLock.obtain()) {
IndexReader.unlock(directory) ;
} else {
writeLock.release() ;
}
} catch (IOException e) {
logger.error(Index Validate,e) ;
}
Nader
-Original Message-
From: Otis Gospodnetic [mailto:[EMAIL PROTECTED]
Sent: Friday, April 30, 2004 4:09 PM
To: Lucene Users List; [EMAIL PROTECTED]
Subject: Re: read only file system
If you have a very recent Lucene, then you can disable locks with command
line parameters. I believe a page describing various command line
parameters is on Lucene's Wiki.
Otis
--- Supun Edirisinghe [EMAIL PROTECTED] wrote:
I think I'm alittle confused on how and index is put into use on a
readonly file system
I'm using Lucene in my web application. Our indexes are built off our
database nightly and copied into our web app servers.
I think our web app dies from time to time and sometimes a lock is
left behind from Lucene in /tmp/.
I have read that there is a disableLuceneLocks System Property(is that
the full name or is it something like
org.apache.jakarta...disableLuceneLocks?). But, I'm still not sure how
I can set that. Do I give it as commandline arg to the java VM?
thanks
-
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RE: Disappearing segments
Could you share you're indexing code, and just to make sure id there anything running on your machine that could delete these files, like an a cron job that'll back up the index. You could go by process of elimination and shut down your server and see if the files disappear, coz if the problem is contained within the server you know that you can safely go on the DEBUG rampage. Nader -Original Message- From: Kelvin Tan [mailto:[EMAIL PROTECTED] Sent: Friday, April 30, 2004 9:15 AM To: Lucene Users List Subject: Re: Disappearing segments An update: Daniel Naber suggested using IndexWriter.setUseCompoundFile() to see if it happens with the compound index format. Before I had a chance to try it out, this happened: java.io.FileNotFoundException: C:\index\segments (The system cannot find the file specified) at java.io.RandomAccessFile.open(Native Method) at java.io.RandomAccessFile.init(RandomAccessFile.java:200) at org.apache.lucene.store.FSInputStream$Descriptor.init(FSDirectory.j ava:321) at org.apache.lucene.store.FSInputStream.init(FSDirectory.java:329) at org.apache.lucene.store.FSDirectory.openFile(FSDirectory.java:268) at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:71) at org.apache.lucene.index.IndexWriter$1.doBody(IndexWriter.java:154) at org.apache.lucene.store.Lock$With.run(Lock.java:116) at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:149) at org.apache.lucene.index.IndexWriter.init(IndexWriter.java:131) so even the segments file somehow got deleted. Hoping someone can shed some light on this... Kelvin On Thu, 29 Apr 2004 11:45:36 +0800, Kelvin Tan said: Errr, sorry for the cross-post to lucene-dev as well, but I realized this mail really belongs on lucene-user... I've been experiencing intermittent disappearing segments which result in the following stacktrace: Caused by: java.io.FileNotFoundException: C:\index\_1ae.fnm (The system cannot find the file specified) at java.io.RandomAccessFile.open(Native Method) at java.io.RandomAccessFile.init(RandomAccessFile.java:200) at org.apache.lucene.store.FSInputStream$Descriptor.init(FSDirectory.ja va:321) at org.apache.lucene.store.FSInputStream.init(FSDirectory.java:329) at org.apache.lucene.store.FSDirectory.openFile(FSDirectory.java:268) at org.apache.lucene.index.FieldInfos.init(FieldInfos.java:78) at org.apache.lucene.index.SegmentReader.init(SegmentReader.java:104) at org.apache.lucene.index.SegmentReader.init(SegmentReader.java:95) at org.apache.lucene.index.IndexReader$1.doBody(IndexReader.java:112) at org.apache.lucene.store.Lock$With.run(Lock.java:116) at org.apache.lucene.index.IndexReader.open(IndexReader.java:103) at org.apache.lucene.index.IndexReader.open(IndexReader.java:91) at org.apache.lucene.search.IndexSearcher.init(IndexSearcher.java:75) The segment that disappears (_1ae.fnm) varies. I can't seem to reproduce this error consistently, so don't have a clue what might cause it, but it usually happens after the application has been running for some time. Has anyone experienced something similar, or can anyone point me in the right direction? When this occurs, I need to rebuild the entire index for it to be usable. Very troubling indeed... Kelvin - 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]
ordering Search results
I have read these 2 threads in the mail group: http://www.mail-archive.com/[EMAIL PROTECTED]/msg06943.html http://www.mail-archive.com/[EMAIL PROTECTED]/msg06319.html I'm still wondering how people stil order by a field. I know that it is possible to lexiographicaly sort results. I've been trying to play with boost values to massage Hits into a good order but I think I need to order by the fields to get strict order. thanks - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Preventing duplicate document insertion during optimize
Let's say you have two indexes each with the same document literal. All the fields hash the same and the document is a binary duplicate of a different document in the second index. What happens when you do a merge to create a 3rd index from the first two? I assume you now have two documents that are identical in one index. Is there any way to prevent this? It would be nice to figure out if there's a way to flag a field as a primary key so that if it has already added it to just skip. Kevin -- Please reply using PGP. http://peerfear.org/pubkey.asc NewsMonster - http://www.newsmonster.org/ Kevin A. Burton, Location - San Francisco, CA, Cell - 415.595.9965 AIM/YIM - sfburtonator, Web - http://peerfear.org/ GPG fingerprint: 5FB2 F3E2 760E 70A8 6174 D393 E84D 8D04 99F1 4412 IRC - freenode.net #infoanarchy | #p2p-hackers | #newsmonster signature.asc Description: OpenPGP digital signature
RemoteSearchable
I was wondering if you implemented search using RemoteSearchable. Would you kindly email sample source code. Thanks. Venu Durgam
Re: Preventing duplicate document insertion during optimize
Kevin, I have a similar issue. The only solution I have been able to come up with is, after the merge, to open an IndexReader against the merge index, iterate over all the docs and delete duplicate docs based on my primary key field. Jim --- Kevin A. Burton [EMAIL PROTECTED] wrote: Let's say you have two indexes each with the same document literal. All the fields hash the same and the document is a binary duplicate of a different document in the second index. What happens when you do a merge to create a 3rd index from the first two? I assume you now have two documents that are identical in one index. Is there any way to prevent this? It would be nice to figure out if there's a way to flag a field as a primary key so that if it has already added it to just skip. Kevin -- Please reply using PGP. http://peerfear.org/pubkey.asc NewsMonster - http://www.newsmonster.org/ Kevin A. Burton, Location - San Francisco, CA, Cell - 415.595.9965 AIM/YIM - sfburtonator, Web - http://peerfear.org/ GPG fingerprint: 5FB2 F3E2 760E 70A8 6174 D393 E84D 8D04 99F1 4412 IRC - freenode.net #infoanarchy | #p2p-hackers | #newsmonster ATTACHMENT part 2 application/pgp-signature name=signature.asc __ Do you Yahoo!? Win a $20,000 Career Makeover at Yahoo! HotJobs http://hotjobs.sweepstakes.yahoo.com/careermakeover - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
