Re: [Neo4j] Changes not pushed to slave as expected
Neo team, Which is correct? The slaves periodically ping the master and sync the changes. Or the Master pushes the data to slaves. Now that Neo is entering the world of high availability, can you please promote Master-Follower for identifying the relation? The non-master instances are not slaves really. They are equal to master and just out of courtesy have agreed to co-operate with a peer server. On Thu, Aug 5, 2010 at 7:28 AM, George Ciubotaru george.ciubot...@weedle.com wrote: Hi Peter, I'm working on using Neo4j with .NET technologies (through a REST service), not too much experience with Java. So, unfortunately, I won't be able to debug the code that easily (need Java tools for this that I'm not very familiar with). Thanks, George -Original Message- From: user-boun...@lists.neo4j.org [mailto:user-boun...@lists.neo4j.org] On Behalf Of Peter Neubauer Sent: 05 August 2010 14:51 To: Neo4j user discussions Subject: Re: [Neo4j] Changes not pushed to slave as expected George, not really sure what is happening, seems the log rotate is not triggering the push? Could you mount and debug the source code? Otherwise, I can see if I can recreate it tomorrow ... Cheers, /peter neubauer COO and Sales, Neo Technology GTalk: neubauer.peter Skype peter.neubauer Phone +46 704 106975 LinkedIn http://www.linkedin.com/in/neubauer Twitter http://twitter.com/peterneubauer http://www.neo4j.org - Your high performance graph database. http://www.thoughtmade.com - Scandinavia's coolest Bring-a-Thing party. On Wed, Aug 4, 2010 at 5:00 PM, George Ciubotaru george.ciubot...@weedle.com wrote: Hello, In a master-slave environment I'm expecting that the changes done on the master to be pushed to the server when the logical logs are rotated ( http://wiki.neo4j.org/content/Online_Backup_HA). I'm setting the logical log size (dataSource.setLogicalLogTargetSize(...)) to a small value to easily see the push but when the logs are rotated (I can see in the master store directory that a new nioneo_logical.log.v* is created) nothing is send to the slave. Everything works as expected when I manually call master.rotateLogAndPushToSlaves(), but I would like to avoid doing this manual job. On master side keep_logical_logs auto_rotate are set to true. I'm using kernel version 1.1 and backup version 0.6. Can anybody help me with this? Thank you in advance, George ___ 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 ___ 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
[Neo] Traversal Speed is just 1 millisecond per node
We are considering Neo4J for a decision making application. The application is analogous to a Library having 15 million books. We have BOOKS, PUBLISHERS and STUDENTS as nodes. Every book will have a PUBLISHED_BY relationship to one publisher. STUDENTS may borrow a book, reserve a book or return a borrowed book. Each is a relationship type meaning BORROWED_BY, RESERVED_BY and RETURNS between BOOKS and STUDENTS. When we traverse starting from a publisher, the traversing speed is 200-1000 nodes per millisecond. This is pure traversal to get a book count by publisher. The Neo is failing us when we make a slightly complex query. Starting with a publisher, retrieve all books that are currently lent out. Starting with a publisher, retrieve all books that were borrowed between May 1 2010 and May 10 2010. The response time we got was 1-2 millisecond per book. Before running the test, we created between 0-3 relationships for each book. We have seeded 15,000 students ,1000 publishers and 15 million books. And the server is a 8GB RAM machine. I wonder why the traversal is drastically slow? Regards SDev ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
[Neo] Evaluating Neo4J as an enterprise class application
We are evaluating Neo4J for a business critical application. There will be a User Interface UI component to browse the graph, create nodes and properties as well as create/modify relationships. The data set spans across 7 domains and expected to be around 40 GB. User will manipulate data in 3 domains. A back end integration is expected to manage data in remaining 4 domains. I use the word domain to mean nodes/relationships/attributes that are grouped to perform one activity like Sale Order, Shipping, Distribution etc. The domains are related to each other and queries traverse across different domains We are expecting 500 users per hour to use the system. Each user may initiate a query once in 2 minutes. Each query is expected to traverse through 20,000 nodes and collect 10 properties for filtering/display. I am accountable for implementing this system. You probably know what accountable means:) Say it is related to Guillotine. What should I do to convince myself to move forward? Things that come to my mind are stability, scalability, auditing and monitoring. Stability means the JVM/application won't crash. Scalability means each user will get response in 1-2 second for up to 500 users. Auditing means the system reports its performance for all interactions. Monitoring means health and performance of the system are made visible. Comments and pointers to related articles are appreciated. TIA SDev ___ Neo mailing list User@lists.neo4j.org https://lists.neo4j.org/mailman/listinfo/user
