Re: [Neo4j] neo4j REST server standalone
Hi Mohit, the admin system is meant to eventually be able to provide support for live backups, although there is quite a bit of work left on other components first. The admin interface currently depends on the REST package which, afaik, does not turn on the command-line shell by default. There will be an integrated gremlin web console though. It would probably not be that difficult to add a setting for enabling/disabling command-line shell access though. I added this as a ticket to the github project - http://github.com/neo4j/webadmin/issues/issue/8. /Jacob On Thu, Jul 1, 2010 at 11:34 PM, Mohit Vazirani mohi...@yahoo.com wrote: - Original Message From: Mattias Persson matt...@neotechnology.com To: Neo4j user discussions user@lists.neo4j.org Sent: Thu, July 1, 2010 6:53:48 AM Subject: Re: [Neo4j] neo4j REST server standalone Hi, I'm guessing you would like to specify a configuration file for the database, right? Yes. That can't be done at the moment, but work is put into creating an admin interface to neo4j, initially quite tied to the rest API. I can see if I can whip something up which makes this possible as it is right now. That will be pretty useful. Also, will the admin interface allow me to connect through the shell in R/W mode while the REST server is running? By the way, memory mapping settings are auto-configured if no specific config is given for that. It looks at how much heap you've given it and how big your graph store files are (this is done at startup time, so if the store changes a lot then a restart would be required to have it optimally configured for the new store size). Interesting. Also, I'm trying to perform online backups with this rest server. Are logical logs enabled by default when using the REST server? I cannot find any files matching the pattern *log.v*, all I see is the file nioneo_logical.log.1And if so, is there a way to perform online backups while the REST server is running? 2010/6/30 Mohit Vazirani mohi...@yahoo.com Hi, I'm a beginner to neo4j. Recently set up the standalone rest server in linux (started using neo4j-rest start). I was reviewing http://wiki.neo4j.org/content/Configuration_Settings and was wondering how to specify memory-mapped I/O settings other backup-related settings to the REST server. I couldn't find any section in wrapper.conf that allowed me to do this. Thanks, ~Mohit ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user -- Jacob Hansson Phone: +46 (0) 763503395 Twitter: @jakewins ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] neo4j REST server standalone
2010/7/1 Mohit Vazirani mohi...@yahoo.com - Original Message From: Mattias Persson matt...@neotechnology.com To: Neo4j user discussions user@lists.neo4j.org Sent: Thu, July 1, 2010 6:53:48 AM Subject: Re: [Neo4j] neo4j REST server standalone Hi, I'm guessing you would like to specify a configuration file for the database, right? Yes. That can't be done at the moment, but work is put into creating an admin interface to neo4j, initially quite tied to the rest API. I can see if I can whip something up which makes this possible as it is right now. That will be pretty useful. Also, will the admin interface allow me to connect through the shell in R/W mode while the REST server is running? By the way, memory mapping settings are auto-configured if no specific config is given for that. It looks at how much heap you've given it and how big your graph store files are (this is done at startup time, so if the store changes a lot then a restart would be required to have it optimally configured for the new store size). Interesting. Also, I'm trying to perform online backups with this rest server. Are logical logs enabled by default when using the REST server? I cannot find any files matching the pattern *log.v*, all I see is the file nioneo_logical.log.1And if so, is there a way to perform online backups while the REST server is running? I've done some modifications and the REST server now looks in the database directory for a neo4j.properties file and uses it for configuration if it exists. There you can set keep_logical_logs=true to make neo4j keep its logical (.v??) logs for online backup. However, to perform online backup there should probably be a configuration parameter in wrapper.conf which enables that I'd guess. Are you planning to do online backup to another running database or to another disk? The shell is now also startable via a configuration parameter, so if you supply a enable_remote_shell=true parameter in that neo4j.properties file it will be started. Of course, you'd have to download the latest REST standalone server for all this to be working. -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo4j] Online backup via shell
I'm thinking about adding a backup command to the shell which (if the server has online-backup on the classpath) can perform an online-backup to a destination of choice (given that the source db has been copied a first time already to that location). Btw. it'd be nice to get rid of that step somehow. And maybe add a -c argument to the shell main class so that you can do: $ java -jar neo4j-shell-version.jar -c backup /my/backup/db so that you could put it as a cron job or something. That command could also be able to set data sources to keep their logical logs or other stuff. Just a thought... would that be useful? -- Mattias Persson, [matt...@neotechnology.com] Hacker, Neo Technology www.neotechnology.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] LuceneFulltextIndexService searching example
sorry should of seen that, thanks for your help
Paddy
On Wed, Jun 30, 2010 at 4:27 AM, Mattias Persson
matt...@neotechnology.comwrote:
As the example states you must use the LuceneFulltextQueryIndexService (not
the LuceneFulltextIndexService)!
2010/6/30 Paddy paddyf...@gmail.com
I have been trying out the example at:
http://wiki.neo4j.org/content/Indexing_with_IndexService
I'm trying to implement LuceneFulltextIndexService searching
I made this test app, just copying and pasting from the example.
The results I'm getting are different from the results expected from the
wiki example.
What am i doing wrong? I'm using the latest 1.1 snapshot.
OUTPUT:
1: nodes size 0
2: nodes size 1
3: nodes size 1
4: nodes size 2
5: nodes size 0
6: nodes size 0
7: nodes size 0
8: nodes size 0
package test;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.index.IndexHits;
import org.neo4j.index.IndexService;
import org.neo4j.index.lucene.LuceneFulltextIndexService;
import org.neo4j.kernel.EmbeddedGraphDatabase;
public class LuceneTest {
private static GraphDatabaseService graphDb;
private static IndexService index;
public static void main( final String[] args ){
graphDb = new EmbeddedGraphDatabase(target/neo4j-db-lucene6);
index= new LuceneFulltextIndexService(graphDb);
Transaction tx = graphDb.beginTx();
try
{
Node andy = graphDb.createNode();
Node larry = graphDb.createNode();
andy.setProperty( name, Andy Wachowski );
andy.setProperty( title, Director );
larry.setProperty( name, Larry Wachowski );
larry.setProperty( title, Director );
index.index( andy, name, andy.getProperty( name ) );
index.index( andy, title, andy.getProperty( title ) );
index.index( larry, name, larry.getProperty( name ) );
index.index( larry, title, larry.getProperty( title ) );
IndexHitsNode nodes = index.getNodes( name, wachow*
andy
); // -- andy and larry
System.out.println(1: nodes size + nodes.size());
nodes = index.getNodes( name, Andy ); // -- andy
System.out.println(2: nodes size + nodes.size());
nodes = index.getNodes( name, andy ); // -- andy
System.out.println(3: nodes size + nodes.size());
nodes = index.getNodes( name, wachowski ); // -- andy and
larry
System.out.println(4: nodes size + nodes.size());
nodes = index.getNodes( name, +wachow* +larry ); // --
larry
System.out.println(5: nodes size + nodes.size());
nodes = index.getNodes( name, andy AND larry ); // --
System.out.println(6: nodes size + nodes.size());
nodes = index.getNodes( name, andy OR larry ); // -- andy
and larry
System.out.println(7: nodes size + nodes.size());
nodes = index.getNodes( name, Wachowski AND larry ); //
--
larry
System.out.println(8: nodes size + nodes.size());
tx.success();
}
finally
{
tx.finish();
graphDb.shutdown();
}
}
}
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[Neo4j] Identifying similar nodes in a 2-mode network
Hi All, I am wondering if there is an algorithm that can identify nodes that are similar based upon there relationships to other nodes of a different type. For example, if I have a graph of people and items purchased, I would like to be able to identify people with similar buying habits. I think this is different from cliques in that the similar nodes may not know each other. A popular application would be how Netflix can retrieve a list of users with similar tastes to your own, based upon your movie ratings (a different type of node), as opposed to how Facebook suggest friends base upon mutual friends (similar types of nodes). I suppose there are at least two main approaches to the solution; one where no preprocessing to the data is performed but instead a query returns the most similar node by traversing the graph starting from the input node; and another where somehow an algorithm maps these nodes into some (2-dimensional?) space similar to how layout algorithms work, and then the query would for similar nodes would be a spatial query where the distance to the input node equates to degree of similarity. If seems to me like this concept would be prevalent in document management. Am I on the right track? Are there algorithms or other research for this out there? Any suggestions on how to structure a graph to support this type of query? Thanks, Paul Jackson ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Identifying similar nodes in a 2-mode network
Hello, I am wondering if there is an algorithm that can identify nodes that are similar based upon there relationships to other nodes of a different type. For example, if I have a graph of people and items purchased, I would like to be able to identify people with similar buying habits. I think this is different from cliques in that the similar nodes may not know each other. A popular application would be how Netflix can retrieve a list of users with similar tastes to your own, based upon your movie ratings (a different type of node), as opposed to how Facebook suggest friends base upon mutual friends (similar types of nodes). The method I use for similarity determination is as follows. To rank a vertex relative to all other vertices with respect to a bundle (i.e. shared resources), simply execute an algorithm of the form: ./ou...@label=x]/inV/i...@label=x]/outV[g:except($_)] This will rank all vertices relative to . (the root) given the label X (e.g. friend, purchased, likes, visited, etc.). Modifications to this theme include: 1. X is a set of labels 2. inV is filtered by predicate (e.g. similarity based on the notion of liking the movie Predator) 3. Use any number of sampling methods if the edges are weighted (i.e. to account for rating systems) I say more on these ideas on slides 70-72 in this presentation http://www.slideshare.net/slidarko/graph-windycitydb2010 Take care, Marko. http://markorodriguez.com http://tinkerpop.com ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
Re: [Neo4j] Online backup via shell
On 2 July 2010 15:45, Mattias Persson matt...@neotechnology.com wrote: Just a thought... would that be useful? I bet it can be useful! Especially if you add a command to restore ;-) -- Javier de la Rosa http://versae.es ___ Neo4j mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
